Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86

* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86: (32 commits)
  x86: cpa, strict range check in try_preserve_large_page()
  x86: cpa, enable CONFIG_DEBUG_PAGEALLOC on 64-bit
  x86: cpa, use page pool
  x86: introduce page pool in cpa
  x86: DEBUG_PAGEALLOC: enable after mem_init()
  brk: help text typo fix
  lguest: accept guest _PAGE_PWT page table entries
  x86 PM: update stale comments
  x86 PM: consolidate suspend and hibernation code
  x86 PM: rename 32-bit files in arch/x86/power
  x86 PM: move 64-bit hibernation files to arch/x86/power
  x86: trivial printk optimizations
  x86: fix early_ioremap pagetable ops
  x86: construct 32-bit boot time page tables in native format.
  x86, core: remove CONFIG_FORCED_INLINING
  x86: avoid unused variable warning in mm/init_64.c
  x86: fixup more paravirt fallout
  brk: document randomize_va_space and CONFIG_COMPAT_BRK (was Re:
  x86: fix sparse warnings in acpi/bus.c
  x86: fix sparse warning in topology.c
  ...

Documentation/feature-removal-schedule.txt

@@ -111,15 +111,6 @@ Who:	Christoph Hellwig <hch@lst.de>
 
 ---------------------------
 
-What:	CONFIG_FORCED_INLINING
-When:	June 2006
-Why:	Config option is there to see if gcc is good enough. (in january
-        2006). If it is, the behavior should just be the default. If it's not,
-	the option should just go away entirely.
-Who:    Arjan van de Ven
-
----------------------------
-
 What:   eepro100 network driver
 When:   January 2007
 Why:    replaced by the e100 driver

Documentation/sysctl/kernel.txt

@@ -41,6 +41,7 @@ show up in /proc/sys/kernel:
 - pid_max
 - powersave-nap               [ PPC only ]
 - printk
+- randomize_va_space
 - real-root-dev               ==> Documentation/initrd.txt
 - reboot-cmd                  [ SPARC only ]
 - rtsig-max
@@ -280,6 +281,34 @@ send before ratelimiting kicks in.
 
 ==============================================================
 
+randomize-va-space:
+
+This option can be used to select the type of process address
+space randomization that is used in the system, for architectures
+that support this feature.
+
+0 - Turn the process address space randomization off by default.
+
+1 - Make the addresses of mmap base, stack and VDSO page randomized.
+    This, among other things, implies that shared libraries will be
+    loaded to random addresses. Also for PIE-linked binaries, the location
+    of code start is randomized.
+
+    With heap randomization, the situation is a little bit more
+    complicated.
+    There a few legacy applications out there (such as some ancient
+    versions of libc.so.5 from 1996) that assume that brk area starts
+    just after the end of the code+bss. These applications break when
+    start of the brk area is randomized. There are however no known
+    non-legacy applications that would be broken this way, so for most
+    systems it is safe to choose full randomization. However there is
+    a CONFIG_COMPAT_BRK option for systems with ancient and/or broken
+    binaries, that makes heap non-randomized, but keeps all other
+    parts of process address space randomized if randomize_va_space
+    sysctl is turned on.
+
+==============================================================
+
 reboot-cmd: (Sparc only)
 
 ??? This seems to be a way to give an argument to the Sparc

arch/x86/Kconfig.debug

@@ -34,13 +34,9 @@ config DEBUG_STACK_USAGE
 
 	  This option will slow down process creation somewhat.
 
-comment "Page alloc debug is incompatible with Software Suspend on i386"
-	depends on DEBUG_KERNEL && HIBERNATION
-	depends on X86_32
-
 config DEBUG_PAGEALLOC
 	bool "Debug page memory allocations"
-	depends on DEBUG_KERNEL && X86_32
+	depends on DEBUG_KERNEL
 	help
 	  Unmap pages from the kernel linear mapping after free_pages().
 	  This results in a large slowdown, but helps to find certain types

arch/x86/Makefile

@@ -191,8 +191,10 @@ drivers-$(CONFIG_PCI)            += arch/x86/pci/
 # must be linked after kernel/
 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 
-ifeq ($(CONFIG_X86_32),y)
+# suspend and hibernation support
 drivers-$(CONFIG_PM) += arch/x86/power/
+
+ifeq ($(CONFIG_X86_32),y)
 drivers-$(CONFIG_FB) += arch/x86/video/
 endif
 

arch/x86/boot/printf.c

@@ -33,8 +33,8 @@ static int skip_atoi(const char **s)
 #define PLUS	4		/* show plus */
 #define SPACE	8		/* space if plus */
 #define LEFT	16		/* left justified */
-#define SPECIAL	32		/* 0x */
-#define LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */
+#define SMALL	32		/* Must be 32 == 0x20 */
+#define SPECIAL	64		/* 0x */
 
 #define do_div(n,base) ({ \
 int __res; \
@@ -45,12 +45,16 @@ __res; })
 static char *number(char *str, long num, int base, int size, int precision,
 		    int type)
 {
-	char c, sign, tmp[66];
-	const char *digits = "0123456789abcdefghijklmnopqrstuvwxyz";
+	/* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
+	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
+
+	char tmp[66];
+	char c, sign, locase;
 	int i;
 
-	if (type & LARGE)
-		digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
+	 * produces same digits or (maybe lowercased) letters */
+	locase = (type & SMALL);
 	if (type & LEFT)
 		type &= ~ZEROPAD;
 	if (base < 2 || base > 36)
@@ -81,7 +85,7 @@ static char *number(char *str, long num, int base, int size, int precision,
 		tmp[i++] = '0';
 	else
 		while (num != 0)
-			tmp[i++] = digits[do_div(num, base)];
+			tmp[i++] = (digits[do_div(num, base)] | locase);
 	if (i > precision)
 		precision = i;
 	size -= precision;
@@ -95,7 +99,7 @@ static char *number(char *str, long num, int base, int size, int precision,
 			*str++ = '0';
 		else if (base == 16) {
 			*str++ = '0';
-			*str++ = digits[33];
+			*str++ = ('X' | locase);
 		}
 	}
 	if (!(type & LEFT))
@@ -244,9 +248,9 @@ int vsprintf(char *buf, const char *fmt, va_list args)
 			base = 8;
 			break;
 
-		case 'X':
-			flags |= LARGE;
 		case 'x':
+			flags |= SMALL;
+		case 'X':
 			base = 16;
 			break;
 

arch/x86/configs/i386_defconfig

@@ -1421,7 +1421,6 @@ CONFIG_DEBUG_BUGVERBOSE=y
 # CONFIG_DEBUG_VM is not set
 # CONFIG_DEBUG_LIST is not set
 # CONFIG_FRAME_POINTER is not set
-# CONFIG_FORCED_INLINING is not set
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_LKDTM is not set
 # CONFIG_FAULT_INJECTION is not set

arch/x86/configs/x86_64_defconfig

@@ -1346,7 +1346,6 @@ CONFIG_DEBUG_BUGVERBOSE=y
 # CONFIG_DEBUG_VM is not set
 # CONFIG_DEBUG_LIST is not set
 # CONFIG_FRAME_POINTER is not set
-# CONFIG_FORCED_INLINING is not set
 # CONFIG_RCU_TORTURE_TEST is not set
 # CONFIG_LKDTM is not set
 # CONFIG_FAULT_INJECTION is not set

arch/x86/kernel/Makefile

@@ -84,8 +84,6 @@ ifeq ($(CONFIG_X86_64),y)
         obj-y				+= genapic_64.o genapic_flat_64.o
         obj-$(CONFIG_X86_PM_TIMER)	+= pmtimer_64.o
         obj-$(CONFIG_AUDIT)		+= audit_64.o
-        obj-$(CONFIG_PM)		+= suspend_64.o
-        obj-$(CONFIG_HIBERNATION)	+= suspend_asm_64.o
 
         obj-$(CONFIG_GART_IOMMU)	+= pci-gart_64.o aperture_64.o
         obj-$(CONFIG_CALGARY_IOMMU)	+= pci-calgary_64.o tce_64.o

arch/x86/kernel/cpu/mcheck/therm_throt.c

@@ -118,7 +118,7 @@ static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev)
 
 static __cpuinit void thermal_throttle_remove_dev(struct sys_device *sys_dev)
 {
-	return sysfs_remove_group(&sys_dev->kobj, &thermal_throttle_attr_group);
+	sysfs_remove_group(&sys_dev->kobj, &thermal_throttle_attr_group);
 }
 
 /* Mutex protecting device creation against CPU hotplug */

arch/x86/kernel/entry_32.S

@@ -409,7 +409,8 @@ restore_nocheck_notrace:
 	RESTORE_REGS
 	addl $4, %esp			# skip orig_eax/error_code
 	CFI_ADJUST_CFA_OFFSET -4
-1:	INTERRUPT_RETURN
+ENTRY(irq_return)
+	INTERRUPT_RETURN
 .section .fixup,"ax"
 iret_exc:
 	pushl $0			# no error code
@@ -418,7 +419,7 @@ iret_exc:
 .previous
 .section __ex_table,"a"
 	.align 4
-	.long 1b,iret_exc
+	.long irq_return,iret_exc
 .previous
 
 	CFI_RESTORE_STATE
@@ -865,20 +866,16 @@ nmi_espfix_stack:
 	RESTORE_REGS
 	lss 12+4(%esp), %esp		# back to espfix stack
 	CFI_ADJUST_CFA_OFFSET -24
-1:	INTERRUPT_RETURN
+	jmp irq_return
 	CFI_ENDPROC
-.section __ex_table,"a"
-	.align 4
-	.long 1b,iret_exc
-.previous
 KPROBE_END(nmi)
 
 #ifdef CONFIG_PARAVIRT
 ENTRY(native_iret)
-1:	iret
+	iret
 .section __ex_table,"a"
 	.align 4
-	.long 1b,iret_exc
+	.long native_iret, iret_exc
 .previous
 END(native_iret)
 

arch/x86/kernel/entry_64.S

@@ -582,15 +582,23 @@ retint_restore_args:	/* return to kernel space */
 	TRACE_IRQS_IRETQ
 restore_args:
 	RESTORE_ARGS 0,8,0
-#ifdef CONFIG_PARAVIRT
+
+ENTRY(irq_return)
 	INTERRUPT_RETURN
-#endif
+
+	.section __ex_table, "a"
+	.quad irq_return, bad_iret
+	.previous
+
+#ifdef CONFIG_PARAVIRT
 ENTRY(native_iret)
 	iretq
 
 	.section __ex_table,"a"
 	.quad native_iret, bad_iret
 	.previous
+#endif
+
 	.section .fixup,"ax"
 bad_iret:
 	/*
@@ -804,7 +812,7 @@ paranoid_swapgs\trace:
 	SWAPGS_UNSAFE_STACK
 paranoid_restore\trace:
 	RESTORE_ALL 8
-	INTERRUPT_RETURN
+	jmp irq_return
 paranoid_userspace\trace:
 	GET_THREAD_INFO(%rcx)
 	movl threadinfo_flags(%rcx),%ebx
@@ -919,7 +927,7 @@ error_kernelspace:
 	   iret run with kernel gs again, so don't set the user space flag.
 	   B stepping K8s sometimes report an truncated RIP for IRET 
 	   exceptions returning to compat mode. Check for these here too. */
-	leaq native_iret(%rip),%rbp
+	leaq irq_return(%rip),%rbp
 	cmpq %rbp,RIP(%rsp) 
 	je   error_swapgs
 	movl %ebp,%ebp	/* zero extend */

arch/x86/kernel/geode_32.c

@@ -163,14 +163,11 @@ EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
 
 static int __init geode_southbridge_init(void)
 {
-	int timers;
-
 	if (!is_geode())
 		return -ENODEV;
 
 	init_lbars();
-	timers = geode_mfgpt_detect();
-	printk(KERN_INFO "geode:  %d MFGPT timers available.\n", timers);
+	(void) mfgpt_timer_setup();
 	return 0;
 }
 

arch/x86/kernel/head_32.S

@@ -19,6 +19,10 @@
 #include <asm/thread_info.h>
 #include <asm/asm-offsets.h>
 #include <asm/setup.h>
+#include <asm/processor-flags.h>
+
+/* Physical address */
+#define pa(X) ((X) - __PAGE_OFFSET)
 
 /*
  * References to members of the new_cpu_data structure.
@@ -80,10 +84,6 @@ INIT_MAP_BEYOND_END = BOOTBITMAP_SIZE + (PAGE_TABLE_SIZE + ALLOCATOR_SLOP)*PAGE_
  */
 .section .text.head,"ax",@progbits
 ENTRY(startup_32)
-	/* check to see if KEEP_SEGMENTS flag is meaningful */
-	cmpw $0x207, BP_version(%esi)
-	jb 1f
-
 	/* test KEEP_SEGMENTS flag to see if the bootloader is asking
 		us to not reload segments */
 	testb $(1<<6), BP_loadflags(%esi)
@@ -92,7 +92,7 @@ ENTRY(startup_32)
 /*
  * Set segments to known values.
  */
-1:	lgdt boot_gdt_descr - __PAGE_OFFSET
+	lgdt pa(boot_gdt_descr)
 	movl $(__BOOT_DS),%eax
 	movl %eax,%ds
 	movl %eax,%es
@@ -105,8 +105,8 @@ ENTRY(startup_32)
  */
 	cld
 	xorl %eax,%eax
-	movl $__bss_start - __PAGE_OFFSET,%edi
-	movl $__bss_stop - __PAGE_OFFSET,%ecx
+	movl $pa(__bss_start),%edi
+	movl $pa(__bss_stop),%ecx
 	subl %edi,%ecx
 	shrl $2,%ecx
 	rep ; stosl
@@ -118,31 +118,32 @@ ENTRY(startup_32)
  * (kexec on panic case). Hence copy out the parameters before initializing
  * page tables.
  */
-	movl $(boot_params - __PAGE_OFFSET),%edi
+	movl $pa(boot_params),%edi
 	movl $(PARAM_SIZE/4),%ecx
 	cld
 	rep
 	movsl
-	movl boot_params - __PAGE_OFFSET + NEW_CL_POINTER,%esi
+	movl pa(boot_params) + NEW_CL_POINTER,%esi
 	andl %esi,%esi
 	jz 1f			# No comand line
-	movl $(boot_command_line - __PAGE_OFFSET),%edi
+	movl $pa(boot_command_line),%edi
 	movl $(COMMAND_LINE_SIZE/4),%ecx
 	rep
 	movsl
 1:
 
 #ifdef CONFIG_PARAVIRT
-	cmpw $0x207, (boot_params + BP_version - __PAGE_OFFSET)
+	/* This is can only trip for a broken bootloader... */
+	cmpw $0x207, pa(boot_params + BP_version)
 	jb default_entry
 
 	/* Paravirt-compatible boot parameters.  Look to see what architecture
 		we're booting under. */
-	movl (boot_params + BP_hardware_subarch - __PAGE_OFFSET), %eax
+	movl pa(boot_params + BP_hardware_subarch), %eax
 	cmpl $num_subarch_entries, %eax
 	jae bad_subarch
 
-	movl subarch_entries - __PAGE_OFFSET(,%eax,4), %eax
+	movl pa(subarch_entries)(,%eax,4), %eax
 	subl $__PAGE_OFFSET, %eax
 	jmp *%eax
 
@@ -170,17 +171,68 @@ num_subarch_entries = (. - subarch_entries) / 4
  * Mappings are created both at virtual address 0 (identity mapping)
  * and PAGE_OFFSET for up to _end+sizeof(page tables)+INIT_MAP_BEYOND_END.
  *
- * Warning: don't use %esi or the stack in this code.  However, %esp
- * can be used as a GPR if you really need it...
+ * Note that the stack is not yet set up!
  */
-page_pde_offset = (__PAGE_OFFSET >> 20);
+#define PTE_ATTR	0x007		/* PRESENT+RW+USER */
+#define PDE_ATTR	0x067		/* PRESENT+RW+USER+DIRTY+ACCESSED */
+#define PGD_ATTR	0x001		/* PRESENT (no other attributes) */
 
 default_entry:
-	movl $(pg0 - __PAGE_OFFSET), %edi
-	movl $(swapper_pg_dir - __PAGE_OFFSET), %edx
-	movl $0x007, %eax			/* 0x007 = PRESENT+RW+USER */
+#ifdef CONFIG_X86_PAE
+
+	/*
+	 * In PAE mode swapper_pg_dir is statically defined to contain enough
+	 * entries to cover the VMSPLIT option (that is the top 1, 2 or 3
+	 * entries). The identity mapping is handled by pointing two PGD
+	 * entries to the first kernel PMD.
+	 *
+	 * Note the upper half of each PMD or PTE are always zero at
+	 * this stage.
+	 */
+
+#define KPMDS ((0x100000000-__PAGE_OFFSET) >> 30) /* Number of kernel PMDs */
+
+	xorl %ebx,%ebx				/* %ebx is kept at zero */
+
+	movl $pa(pg0), %edi
+	movl $pa(swapper_pg_pmd), %edx
+	movl $PTE_ATTR, %eax
+10:
+	leal PDE_ATTR(%edi),%ecx		/* Create PMD entry */
+	movl %ecx,(%edx)			/* Store PMD entry */
+						/* Upper half already zero */
+	addl $8,%edx
+	movl $512,%ecx
+11:
+	stosl
+	xchgl %eax,%ebx
+	stosl
+	xchgl %eax,%ebx
+	addl $0x1000,%eax
+	loop 11b
+
+	/*
+	 * End condition: we must map up to and including INIT_MAP_BEYOND_END
+	 * bytes beyond the end of our own page tables.
+	 */
+	leal (INIT_MAP_BEYOND_END+PTE_ATTR)(%edi),%ebp
+	cmpl %ebp,%eax
+	jb 10b
+1:
+	movl %edi,pa(init_pg_tables_end)
+
+	/* Do early initialization of the fixmap area */
+	movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax
+	movl %eax,pa(swapper_pg_pmd+0x1000*KPMDS-8)
+#else	/* Not PAE */
+
+page_pde_offset = (__PAGE_OFFSET >> 20);
+
+	movl $pa(pg0), %edi
+	movl $pa(swapper_pg_dir), %edx
+	movl $PTE_ATTR, %eax
 10:
-	leal 0x007(%edi),%ecx			/* Create PDE entry */
+	leal PDE_ATTR(%edi),%ecx		/* Create PDE entry */
 	movl %ecx,(%edx)			/* Store identity PDE entry */
 	movl %ecx,page_pde_offset(%edx)		/* Store kernel PDE entry */
 	addl $4,%edx
@@ -189,19 +241,20 @@ default_entry:
 	stosl
 	addl $0x1000,%eax
 	loop 11b
-	/* End condition: we must map up to and including INIT_MAP_BEYOND_END */
-	/* bytes beyond the end of our own page tables; the +0x007 is the attribute bits */
-	leal (INIT_MAP_BEYOND_END+0x007)(%edi),%ebp
+	/*
+	 * End condition: we must map up to and including INIT_MAP_BEYOND_END
+	 * bytes beyond the end of our own page tables; the +0x007 is
+	 * the attribute bits
+	 */
+	leal (INIT_MAP_BEYOND_END+PTE_ATTR)(%edi),%ebp
 	cmpl %ebp,%eax
 	jb 10b
-	movl %edi,(init_pg_tables_end - __PAGE_OFFSET)
-
-	/* Do an early initialization of the fixmap area */
-	movl $(swapper_pg_dir - __PAGE_OFFSET), %edx
-	movl $(swapper_pg_pmd - __PAGE_OFFSET), %eax
-	addl $0x67, %eax			/* 0x67 == _PAGE_TABLE */
-	movl %eax, 4092(%edx)
+	movl %edi,pa(init_pg_tables_end)
 
+	/* Do early initialization of the fixmap area */
+	movl $pa(swapper_pg_fixmap)+PDE_ATTR,%eax
+	movl %eax,pa(swapper_pg_dir+0xffc)
+#endif
 	jmp 3f
 /*
  * Non-boot CPU entry point; entered from trampoline.S
@@ -241,7 +294,7 @@ ENTRY(startup_32_smp)
  *	NOTE! We have to correct for the fact that we're
  *	not yet offset PAGE_OFFSET..
  */
-#define cr4_bits mmu_cr4_features-__PAGE_OFFSET
+#define cr4_bits pa(mmu_cr4_features)
 	movl cr4_bits,%edx
 	andl %edx,%edx
 	jz 6f
@@ -276,10 +329,10 @@ ENTRY(startup_32_smp)
 /*
  * Enable paging
  */
-	movl $swapper_pg_dir-__PAGE_OFFSET,%eax
+	movl $pa(swapper_pg_dir),%eax
 	movl %eax,%cr3		/* set the page table pointer.. */
 	movl %cr0,%eax
-	orl $0x80000000,%eax
+	orl  $X86_CR0_PG,%eax
 	movl %eax,%cr0		/* ..and set paging (PG) bit */
 	ljmp $__BOOT_CS,$1f	/* Clear prefetch and normalize %eip */
 1:
@@ -552,16 +605,44 @@ ENTRY(_stext)
  */
 .section ".bss.page_aligned","wa"
 	.align PAGE_SIZE_asm
+#ifdef CONFIG_X86_PAE
+ENTRY(swapper_pg_pmd)
+	.fill 1024*KPMDS,4,0
+#else
 ENTRY(swapper_pg_dir)
 	.fill 1024,4,0
-ENTRY(swapper_pg_pmd)
+#endif
+ENTRY(swapper_pg_fixmap)
 	.fill 1024,4,0
 ENTRY(empty_zero_page)
 	.fill 4096,1,0
-
 /*
  * This starts the data section.
  */
+#ifdef CONFIG_X86_PAE
+.section ".data.page_aligned","wa"
+	/* Page-aligned for the benefit of paravirt? */
+	.align PAGE_SIZE_asm
+ENTRY(swapper_pg_dir)
+	.long	pa(swapper_pg_pmd+PGD_ATTR),0		/* low identity map */
+# if KPMDS == 3
+	.long	pa(swapper_pg_pmd+PGD_ATTR),0
+	.long	pa(swapper_pg_pmd+PGD_ATTR+0x1000),0
+	.long	pa(swapper_pg_pmd+PGD_ATTR+0x2000),0
+# elif KPMDS == 2
+	.long	0,0
+	.long	pa(swapper_pg_pmd+PGD_ATTR),0
+	.long	pa(swapper_pg_pmd+PGD_ATTR+0x1000),0
+# elif KPMDS == 1
+	.long	0,0
+	.long	0,0
+	.long	pa(swapper_pg_pmd+PGD_ATTR),0
+# else
+#  error "Kernel PMDs should be 1, 2 or 3"
+# endif
+	.align PAGE_SIZE_asm		/* needs to be page-sized too */
+#endif
+
 .data
 ENTRY(stack_start)
 	.long init_thread_union+THREAD_SIZE

arch/x86/kernel/mfgpt_32.c

@@ -12,48 +12,37 @@
  */
 
 /*
- * We are using the 32Khz input clock - its the only one that has the
+ * We are using the 32.768kHz input clock - it's the only one that has the
  * ranges we find desirable.  The following table lists the suitable
- * divisors and the associated hz, minimum interval
- * and the maximum interval:
+ * divisors and the associated Hz, minimum interval and the maximum interval:
  *
- *  Divisor   Hz      Min Delta (S) Max Delta (S)
- *   1        32000     .0005          2.048
- *   2        16000      .001          4.096
- *   4         8000      .002          8.192
- *   8         4000      .004         16.384
- *   16        2000      .008         32.768
- *   32        1000      .016         65.536
- *   64         500      .032        131.072
- *  128         250      .064        262.144
- *  256         125      .128        524.288
+ *  Divisor   Hz      Min Delta (s)  Max Delta (s)
+ *   1        32768   .00048828125      2.000
+ *   2        16384   .0009765625       4.000
+ *   4         8192   .001953125        8.000
+ *   8         4096   .00390625        16.000
+ *   16        2048   .0078125         32.000
+ *   32        1024   .015625          64.000
+ *   64         512   .03125          128.000
+ *  128         256   .0625           256.000
+ *  256         128   .125            512.000
  */
 
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
-#include <linux/module.h>
 #include <asm/geode.h>
 
-#define F_AVAIL    0x01
-
 static struct mfgpt_timer_t {
-	int flags;
-	struct module *owner;
+	unsigned int avail:1;
 } mfgpt_timers[MFGPT_MAX_TIMERS];
 
 /* Selected from the table above */
 
 #define MFGPT_DIVISOR 16
 #define MFGPT_SCALE  4     /* divisor = 2^(scale) */
-#define MFGPT_HZ  (32000 / MFGPT_DIVISOR)
+#define MFGPT_HZ  (32768 / MFGPT_DIVISOR)
 #define MFGPT_PERIODIC (MFGPT_HZ / HZ)
 
-#ifdef CONFIG_GEODE_MFGPT_TIMER
-static int __init mfgpt_timer_setup(void);
-#else
-#define mfgpt_timer_setup() (0)
-#endif
-
 /* Allow for disabling of MFGPTs */
 static int disable;
 static int __init mfgpt_disable(char *s)
@@ -85,28 +74,37 @@ __setup("mfgptfix", mfgpt_fix);
  * In other cases (such as with VSAless OpenFirmware), the system firmware
  * leaves timers available for us to use.
  */
-int __init geode_mfgpt_detect(void)
+
+
+static int timers = -1;
+
+static void geode_mfgpt_detect(void)
 {
-	int count = 0, i;
+	int i;
 	u16 val;
 
+	timers = 0;
+
 	if (disable) {
-		printk(KERN_INFO "geode-mfgpt:  Skipping MFGPT setup\n");
-		return 0;
+		printk(KERN_INFO "geode-mfgpt:  MFGPT support is disabled\n");
+		goto done;
+	}
+
+	if (!geode_get_dev_base(GEODE_DEV_MFGPT)) {
+		printk(KERN_INFO "geode-mfgpt:  MFGPT LBAR is not set up\n");
+		goto done;
 	}
 
 	for (i = 0; i < MFGPT_MAX_TIMERS; i++) {
 		val = geode_mfgpt_read(i, MFGPT_REG_SETUP);
 		if (!(val & MFGPT_SETUP_SETUP)) {
-			mfgpt_timers[i].flags = F_AVAIL;
-			count++;
+			mfgpt_timers[i].avail = 1;
+			timers++;
 		}
 	}
 
-	/* set up clock event device, if desired */
-	i = mfgpt_timer_setup();
-
-	return count;
+done:
+	printk(KERN_INFO "geode-mfgpt:  %d MFGPT timers available.\n", timers);
 }
 
 int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable)
@@ -183,36 +181,41 @@ int geode_mfgpt_set_irq(int timer, int cmp, int irq, int enable)
 	return 0;
 }
 
-static int mfgpt_get(int timer, struct module *owner)
+static int mfgpt_get(int timer)
 {
-	mfgpt_timers[timer].flags &= ~F_AVAIL;
-	mfgpt_timers[timer].owner = owner;
+	mfgpt_timers[timer].avail = 0;
 	printk(KERN_INFO "geode-mfgpt:  Registered timer %d\n", timer);
 	return timer;
 }
 
-int geode_mfgpt_alloc_timer(int timer, int domain, struct module *owner)
+int geode_mfgpt_alloc_timer(int timer, int domain)
 {
 	int i;
 
-	if (!geode_get_dev_base(GEODE_DEV_MFGPT))
-		return -ENODEV;
+	if (timers == -1) {
+		/* timers haven't been detected yet */
+		geode_mfgpt_detect();
+	}
+
+	if (!timers)
+		return -1;
+
 	if (timer >= MFGPT_MAX_TIMERS)
-		return -EIO;
+		return -1;
 
 	if (timer < 0) {
 		/* Try to find an available timer */
 		for (i = 0; i < MFGPT_MAX_TIMERS; i++) {
-			if (mfgpt_timers[i].flags & F_AVAIL)
-				return mfgpt_get(i, owner);
+			if (mfgpt_timers[i].avail)
+				return mfgpt_get(i);
 
 			if (i == 5 && domain == MFGPT_DOMAIN_WORKING)
 				break;
 		}
 	} else {
 		/* If they requested a specific timer, try to honor that */
-		if (mfgpt_timers[timer].flags & F_AVAIL)
-			return mfgpt_get(timer, owner);
+		if (mfgpt_timers[timer].avail)
+			return mfgpt_get(timer);
 	}
 
 	/* No timers available - too bad */
@@ -244,10 +247,11 @@ static int __init mfgpt_setup(char *str)
 }
 __setup("mfgpt_irq=", mfgpt_setup);
 
-static inline void mfgpt_disable_timer(u16 clock)
+static void mfgpt_disable_timer(u16 clock)
 {
-	u16 val = geode_mfgpt_read(clock, MFGPT_REG_SETUP);
-	geode_mfgpt_write(clock, MFGPT_REG_SETUP, val & ~MFGPT_SETUP_CNTEN);
+	/* avoid races by clearing CMP1 and CMP2 unconditionally */
+	geode_mfgpt_write(clock, MFGPT_REG_SETUP, (u16) ~MFGPT_SETUP_CNTEN |
+			MFGPT_SETUP_CMP1 | MFGPT_SETUP_CMP2);
 }
 
 static int mfgpt_next_event(unsigned long, struct clock_event_device *);
@@ -263,7 +267,7 @@ static struct clock_event_device mfgpt_clockevent = {
 	.shift = 32
 };
 
-static inline void mfgpt_start_timer(u16 clock, u16 delta)
+static void mfgpt_start_timer(u16 delta)
 {
 	geode_mfgpt_write(mfgpt_event_clock, MFGPT_REG_CMP2, (u16) delta);
 	geode_mfgpt_write(mfgpt_event_clock, MFGPT_REG_COUNTER, 0);
@@ -278,21 +282,25 @@ static void mfgpt_set_mode(enum clock_event_mode mode,
 	mfgpt_disable_timer(mfgpt_event_clock);
 
 	if (mode == CLOCK_EVT_MODE_PERIODIC)
-		mfgpt_start_timer(mfgpt_event_clock, MFGPT_PERIODIC);
+		mfgpt_start_timer(MFGPT_PERIODIC);
 
 	mfgpt_tick_mode = mode;
 }
 
 static int mfgpt_next_event(unsigned long delta, struct clock_event_device *evt)
 {
-	mfgpt_start_timer(mfgpt_event_clock, delta);
+	mfgpt_start_timer(delta);
 	return 0;
 }
 
-/* Assume (foolishly?), that this interrupt was due to our tick */
-
 static irqreturn_t mfgpt_tick(int irq, void *dev_id)
 {
+	u16 val = geode_mfgpt_read(mfgpt_event_clock, MFGPT_REG_SETUP);
+
+	/* See if the interrupt was for us */
+	if (!(val & (MFGPT_SETUP_SETUP  | MFGPT_SETUP_CMP2 | MFGPT_SETUP_CMP1)))
+		return IRQ_NONE;
+
 	/* Turn off the clock (and clear the event) */
 	mfgpt_disable_timer(mfgpt_event_clock);
 
@@ -320,13 +328,12 @@ static struct irqaction mfgptirq  = {
 	.name = "mfgpt-timer"
 };
 
-static int __init mfgpt_timer_setup(void)
+int __init mfgpt_timer_setup(void)
 {
 	int timer, ret;
 	u16 val;
 
-	timer = geode_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING,
-			THIS_MODULE);
+	timer = geode_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING);
 	if (timer < 0) {
 		printk(KERN_ERR
 		       "mfgpt-timer:  Could not allocate a MFPGT timer\n");
@@ -363,7 +370,7 @@ static int __init mfgpt_timer_setup(void)
 			&mfgpt_clockevent);
 
 	printk(KERN_INFO
-	       "mfgpt-timer:  registering the MFGT timer as a clock event.\n");
+	       "mfgpt-timer:  registering the MFGPT timer as a clock event.\n");
 	clockevents_register_device(&mfgpt_clockevent);
 
 	return 0;

arch/x86/kernel/setup_32.c

@@ -154,7 +154,11 @@ struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 struct cpuinfo_x86 boot_cpu_data __read_mostly = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
 EXPORT_SYMBOL(boot_cpu_data);
 
+#ifndef CONFIG_X86_PAE
 unsigned long mmu_cr4_features;
+#else
+unsigned long mmu_cr4_features = X86_CR4_PAE;
+#endif
 
 /* for MCA, but anyone else can use it if they want */
 unsigned int machine_id;

arch/x86/kernel/topology.c

@@ -53,7 +53,7 @@ EXPORT_SYMBOL(arch_register_cpu);
 
 void arch_unregister_cpu(int num)
 {
-	return unregister_cpu(&per_cpu(cpu_devices, num).cpu);
+	unregister_cpu(&per_cpu(cpu_devices, num).cpu);
 }
 EXPORT_SYMBOL(arch_unregister_cpu);
 #else

arch/x86/mm/init_32.c

@@ -46,6 +46,7 @@
 #include <asm/pgalloc.h>
 #include <asm/sections.h>
 #include <asm/paravirt.h>
+#include <asm/setup.h>
 
 unsigned int __VMALLOC_RESERVE = 128 << 20;
 
@@ -328,44 +329,38 @@ pteval_t __PAGE_KERNEL_EXEC = _PAGE_KERNEL_EXEC;
 
 void __init native_pagetable_setup_start(pgd_t *base)
 {
-#ifdef CONFIG_X86_PAE
-	int i;
+	unsigned long pfn, va;
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+	pte_t *pte;
 
 	/*
-	 * Init entries of the first-level page table to the
-	 * zero page, if they haven't already been set up.
-	 *
-	 * In a normal native boot, we'll be running on a
-	 * pagetable rooted in swapper_pg_dir, but not in PAE
-	 * mode, so this will end up clobbering the mappings
-	 * for the lower 24Mbytes of the address space,
-	 * without affecting the kernel address space.
+	 * Remove any mappings which extend past the end of physical
+	 * memory from the boot time page table:
 	 */
-	for (i = 0; i < USER_PTRS_PER_PGD; i++)
-		set_pgd(&base[i],
-			__pgd(__pa(empty_zero_page) | _PAGE_PRESENT));
-
-	/* Make sure kernel address space is empty so that a pagetable
-	   will be allocated for it. */
-	memset(&base[USER_PTRS_PER_PGD], 0,
-	       KERNEL_PGD_PTRS * sizeof(pgd_t));
-#else
+	for (pfn = max_low_pfn + 1; pfn < 1<<(32-PAGE_SHIFT); pfn++) {
+		va = PAGE_OFFSET + (pfn<<PAGE_SHIFT);
+		pgd = base + pgd_index(va);
+		if (!pgd_present(*pgd))
+			break;
+
+		pud = pud_offset(pgd, va);
+		pmd = pmd_offset(pud, va);
+		if (!pmd_present(*pmd))
+			break;
+
+		pte = pte_offset_kernel(pmd, va);
+		if (!pte_present(*pte))
+			break;
+
+		pte_clear(NULL, va, pte);
+	}
 	paravirt_alloc_pd(&init_mm, __pa(base) >> PAGE_SHIFT);
-#endif
 }
 
 void __init native_pagetable_setup_done(pgd_t *base)
 {
-#ifdef CONFIG_X86_PAE
-	/*
-	 * Add low memory identity-mappings - SMP needs it when
-	 * starting up on an AP from real-mode. In the non-PAE
-	 * case we already have these mappings through head.S.
-	 * All user-space mappings are explicitly cleared after
-	 * SMP startup.
-	 */
-	set_pgd(&base[0], base[USER_PTRS_PER_PGD]);
-#endif
 }
 
 /*
@@ -374,9 +369,8 @@ void __init native_pagetable_setup_done(pgd_t *base)
  * the boot process.
  *
  * If we're booting on native hardware, this will be a pagetable
- * constructed in arch/i386/kernel/head.S, and not running in PAE mode
- * (even if we'll end up running in PAE).  The root of the pagetable
- * will be swapper_pg_dir.
+ * constructed in arch/x86/kernel/head_32.S.  The root of the
+ * pagetable will be swapper_pg_dir.
  *
  * If we're booting paravirtualized under a hypervisor, then there are
  * more options: we may already be running PAE, and the pagetable may
@@ -537,14 +531,6 @@ void __init paging_init(void)
 
 	load_cr3(swapper_pg_dir);
 
-#ifdef CONFIG_X86_PAE
-	/*
-	 * We will bail out later - printk doesn't work right now so
-	 * the user would just see a hanging kernel.
-	 */
-	if (cpu_has_pae)
-		set_in_cr4(X86_CR4_PAE);
-#endif
 	__flush_tlb_all();
 
 	kmap_init();
@@ -675,13 +661,11 @@ void __init mem_init(void)
 	BUG_ON((unsigned long)high_memory		> VMALLOC_START);
 #endif /* double-sanity-check paranoia */
 
-#ifdef CONFIG_X86_PAE
-	if (!cpu_has_pae)
-		panic("cannot execute a PAE-enabled kernel on a PAE-less CPU!");
-#endif
 	if (boot_cpu_data.wp_works_ok < 0)
 		test_wp_bit();
 
+	cpa_init();
+
 	/*
 	 * Subtle. SMP is doing it's boot stuff late (because it has to
 	 * fork idle threads) - but it also needs low mappings for the

arch/x86/mm/init_64.c

@@ -528,13 +528,15 @@ void __init mem_init(void)
 		reservedpages << (PAGE_SHIFT-10),
 		datasize >> 10,
 		initsize >> 10);
+
+	cpa_init();
 }
 
 void free_init_pages(char *what, unsigned long begin, unsigned long end)
 {
-	unsigned long addr;
+	unsigned long addr = begin;
 
-	if (begin >= end)
+	if (addr >= end)
 		return;
 
 	/*
@@ -549,7 +551,7 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
 #else
 	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
 
-	for (addr = begin; addr < end; addr += PAGE_SIZE) {
+	for (; addr < end; addr += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(addr));
 		init_page_count(virt_to_page(addr));
 		memset((void *)(addr & ~(PAGE_SIZE-1)),

arch/x86/mm/ioremap.c

@@ -260,37 +260,42 @@ static int __init early_ioremap_debug_setup(char *str)
 early_param("early_ioremap_debug", early_ioremap_debug_setup);
 
 static __initdata int after_paging_init;
-static __initdata unsigned long bm_pte[1024]
+static __initdata pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
 				__attribute__((aligned(PAGE_SIZE)));
 
-static inline unsigned long * __init early_ioremap_pgd(unsigned long addr)
+static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
 {
-	return (unsigned long *)swapper_pg_dir + ((addr >> 22) & 1023);
+	pgd_t *pgd = &swapper_pg_dir[pgd_index(addr)];
+	pud_t *pud = pud_offset(pgd, addr);
+	pmd_t *pmd = pmd_offset(pud, addr);
+
+	return pmd;
 }
 
-static inline unsigned long * __init early_ioremap_pte(unsigned long addr)
+static inline pte_t * __init early_ioremap_pte(unsigned long addr)
 {
-	return bm_pte + ((addr >> PAGE_SHIFT) & 1023);
+	return &bm_pte[pte_index(addr)];
 }
 
 void __init early_ioremap_init(void)
 {
-	unsigned long *pgd;
+	pmd_t *pmd;
 
 	if (early_ioremap_debug)
 		printk(KERN_INFO "early_ioremap_init()\n");
 
-	pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
-	*pgd = __pa(bm_pte) | _PAGE_TABLE;
+	pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
 	memset(bm_pte, 0, sizeof(bm_pte));
+	pmd_populate_kernel(&init_mm, pmd, bm_pte);
+
 	/*
-	 * The boot-ioremap range spans multiple pgds, for which
+	 * The boot-ioremap range spans multiple pmds, for which
 	 * we are not prepared:
 	 */
-	if (pgd != early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END))) {
+	if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) {
 		WARN_ON(1);
-		printk(KERN_WARNING "pgd %p != %p\n",
-		       pgd, early_ioremap_pgd(fix_to_virt(FIX_BTMAP_END)));
+		printk(KERN_WARNING "pmd %p != %p\n",
+		       pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END)));
 		printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
 			fix_to_virt(FIX_BTMAP_BEGIN));
 		printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END):   %08lx\n",
@@ -304,28 +309,29 @@ void __init early_ioremap_init(void)
 
 void __init early_ioremap_clear(void)
 {
-	unsigned long *pgd;
+	pmd_t *pmd;
 
 	if (early_ioremap_debug)
 		printk(KERN_INFO "early_ioremap_clear()\n");
 
-	pgd = early_ioremap_pgd(fix_to_virt(FIX_BTMAP_BEGIN));
-	*pgd = 0;
-	paravirt_release_pt(__pa(pgd) >> PAGE_SHIFT);
+	pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
+	pmd_clear(pmd);
+	paravirt_release_pt(__pa(bm_pte) >> PAGE_SHIFT);
 	__flush_tlb_all();
 }
 
 void __init early_ioremap_reset(void)
 {
 	enum fixed_addresses idx;
-	unsigned long *pte, phys, addr;
+	unsigned long addr, phys;
+	pte_t *pte;
 
 	after_paging_init = 1;
 	for (idx = FIX_BTMAP_BEGIN; idx >= FIX_BTMAP_END; idx--) {
 		addr = fix_to_virt(idx);
 		pte = early_ioremap_pte(addr);
-		if (*pte & _PAGE_PRESENT) {
-			phys = *pte & PAGE_MASK;
+		if (pte_present(*pte)) {
+			phys = pte_val(*pte) & PAGE_MASK;
 			set_fixmap(idx, phys);
 		}
 	}
@@ -334,7 +340,8 @@ void __init early_ioremap_reset(void)
 static void __init __early_set_fixmap(enum fixed_addresses idx,
 				   unsigned long phys, pgprot_t flags)
 {
-	unsigned long *pte, addr = __fix_to_virt(idx);
+	unsigned long addr = __fix_to_virt(idx);
+	pte_t *pte;
 
 	if (idx >= __end_of_fixed_addresses) {
 		BUG();
@@ -342,9 +349,9 @@ static void __init __early_set_fixmap(enum fixed_addresses idx,
 	}
 	pte = early_ioremap_pte(addr);
 	if (pgprot_val(flags))
-		*pte = (phys & PAGE_MASK) | pgprot_val(flags);
+		set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
 	else
-		*pte = 0;
+		pte_clear(NULL, addr, pte);
 	__flush_tlb_one(addr);
 }
 

arch/x86/mm/pageattr.c

@@ -8,6 +8,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/mm.h>
+#include <linux/interrupt.h>
 
 #include <asm/e820.h>
 #include <asm/processor.h>
@@ -191,7 +192,7 @@ static inline pgprot_t static_protections(pgprot_t prot, unsigned long address)
  * or when the present bit is not set. Otherwise we would return a
  * pointer to a nonexisting mapping.
  */
-pte_t *lookup_address(unsigned long address, int *level)
+pte_t *lookup_address(unsigned long address, unsigned int *level)
 {
 	pgd_t *pgd = pgd_offset_k(address);
 	pud_t *pud;
@@ -252,10 +253,11 @@ static int
 try_preserve_large_page(pte_t *kpte, unsigned long address,
 			struct cpa_data *cpa)
 {
-	unsigned long nextpage_addr, numpages, pmask, psize, flags;
+	unsigned long nextpage_addr, numpages, pmask, psize, flags, addr;
 	pte_t new_pte, old_pte, *tmp;
 	pgprot_t old_prot, new_prot;
-	int level, do_split = 1;
+	int i, do_split = 1;
+	unsigned int level;
 
 	spin_lock_irqsave(&pgd_lock, flags);
 	/*
@@ -301,6 +303,19 @@ try_preserve_large_page(pte_t *kpte, unsigned long address,
 	pgprot_val(new_prot) |= pgprot_val(cpa->mask_set);
 	new_prot = static_protections(new_prot, address);
 
+	/*
+	 * We need to check the full range, whether
+	 * static_protection() requires a different pgprot for one of
+	 * the pages in the range we try to preserve:
+	 */
+	addr = address + PAGE_SIZE;
+	for (i = 1; i < cpa->numpages; i++, addr += PAGE_SIZE) {
+		pgprot_t chk_prot = static_protections(new_prot, addr);
+
+		if (pgprot_val(chk_prot) != pgprot_val(new_prot))
+			goto out_unlock;
+	}
+
 	/*
 	 * If there are no changes, return. maxpages has been updated
 	 * above:
@@ -335,23 +350,103 @@ out_unlock:
 	return do_split;
 }
 
+static LIST_HEAD(page_pool);
+static unsigned long pool_size, pool_pages, pool_low;
+static unsigned long pool_used, pool_failed, pool_refill;
+
+static void cpa_fill_pool(void)
+{
+	struct page *p;
+	gfp_t gfp = GFP_KERNEL;
+
+	/* Do not allocate from interrupt context */
+	if (in_irq() || irqs_disabled())
+		return;
+	/*
+	 * Check unlocked. I does not matter when we have one more
+	 * page in the pool. The bit lock avoids recursive pool
+	 * allocations:
+	 */
+	if (pool_pages >= pool_size || test_and_set_bit_lock(0, &pool_refill))
+		return;
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+	/*
+	 * We could do:
+	 * gfp = in_atomic() ? GFP_ATOMIC : GFP_KERNEL;
+	 * but this fails on !PREEMPT kernels
+	 */
+	gfp =  GFP_ATOMIC | __GFP_NORETRY | __GFP_NOWARN;
+#endif
+
+	while (pool_pages < pool_size) {
+		p = alloc_pages(gfp, 0);
+		if (!p) {
+			pool_failed++;
+			break;
+		}
+		spin_lock_irq(&pgd_lock);
+		list_add(&p->lru, &page_pool);
+		pool_pages++;
+		spin_unlock_irq(&pgd_lock);
+	}
+	clear_bit_unlock(0, &pool_refill);
+}
+
+#define SHIFT_MB		(20 - PAGE_SHIFT)
+#define ROUND_MB_GB		((1 << 10) - 1)
+#define SHIFT_MB_GB		10
+#define POOL_PAGES_PER_GB	16
+
+void __init cpa_init(void)
+{
+	struct sysinfo si;
+	unsigned long gb;
+
+	si_meminfo(&si);
+	/*
+	 * Calculate the number of pool pages:
+	 *
+	 * Convert totalram (nr of pages) to MiB and round to the next
+	 * GiB. Shift MiB to Gib and multiply the result by
+	 * POOL_PAGES_PER_GB:
+	 */
+	gb = ((si.totalram >> SHIFT_MB) + ROUND_MB_GB) >> SHIFT_MB_GB;
+	pool_size = POOL_PAGES_PER_GB * gb;
+	pool_low = pool_size;
+
+	cpa_fill_pool();
+	printk(KERN_DEBUG
+	       "CPA: page pool initialized %lu of %lu pages preallocated\n",
+	       pool_pages, pool_size);
+}
+
 static int split_large_page(pte_t *kpte, unsigned long address)
 {
 	unsigned long flags, pfn, pfninc = 1;
-	gfp_t gfp_flags = GFP_KERNEL;
 	unsigned int i, level;
 	pte_t *pbase, *tmp;
 	pgprot_t ref_prot;
 	struct page *base;
 
-#ifdef CONFIG_DEBUG_PAGEALLOC
-	gfp_flags = GFP_ATOMIC | __GFP_NOWARN;
-#endif
-	base = alloc_pages(gfp_flags, 0);
-	if (!base)
+	/*
+	 * Get a page from the pool. The pool list is protected by the
+	 * pgd_lock, which we have to take anyway for the split
+	 * operation:
+	 */
+	spin_lock_irqsave(&pgd_lock, flags);
+	if (list_empty(&page_pool)) {
+		spin_unlock_irqrestore(&pgd_lock, flags);
 		return -ENOMEM;
+	}
+
+	base = list_first_entry(&page_pool, struct page, lru);
+	list_del(&base->lru);
+	pool_pages--;
+
+	if (pool_pages < pool_low)
+		pool_low = pool_pages;
 
-	spin_lock_irqsave(&pgd_lock, flags);
 	/*
 	 * Check for races, another CPU might have split this page
 	 * up for us already:
@@ -396,17 +491,24 @@ static int split_large_page(pte_t *kpte, unsigned long address)
 	base = NULL;
 
 out_unlock:
+	/*
+	 * If we dropped out via the lookup_address check under
+	 * pgd_lock then stick the page back into the pool:
+	 */
+	if (base) {
+		list_add(&base->lru, &page_pool);
+		pool_pages++;
+	} else
+		pool_used++;
 	spin_unlock_irqrestore(&pgd_lock, flags);
 
-	if (base)
-		__free_pages(base, 0);
-
 	return 0;
 }
 
 static int __change_page_attr(unsigned long address, struct cpa_data *cpa)
 {
-	int level, do_split, err;
+	int do_split, err;
+	unsigned int level;
 	struct page *kpte_page;
 	pte_t *kpte;
 
@@ -598,7 +700,7 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
 	 * Check whether we really changed something:
 	 */
 	if (!cpa.flushtlb)
-		return ret;
+		goto out;
 
 	/*
 	 * No need to flush, when we did not set any of the caching
@@ -617,6 +719,8 @@ static int change_page_attr_set_clr(unsigned long addr, int numpages,
 	else
 		cpa_flush_all(cache);
 
+out:
+	cpa_fill_pool();
 	return ret;
 }
 
@@ -770,6 +874,12 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
 	 * but that can deadlock->flush only current cpu:
 	 */
 	__flush_tlb_all();
+
+	/*
+	 * Try to refill the page pool here. We can do this only after
+	 * the tlb flush.
+	 */
+	cpa_fill_pool();
 }
 #endif
 

arch/x86/power/Makefile

-obj-$(CONFIG_PM)		+= cpu.o
-obj-$(CONFIG_HIBERNATION)	+= swsusp.o suspend.o
+obj-$(CONFIG_PM_SLEEP)		+= cpu_$(BITS).o
+obj-$(CONFIG_HIBERNATION)	+= hibernate_$(BITS).o hibernate_asm_$(BITS).o

arch/x86/kernel/suspend_64.c → arch/x86/power/cpu_64.c

 /*
- * Suspend support specific for i386.
+ * Suspend and hibernation support for x86-64
  *
  * Distribute under GPLv2
  *
+ * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
  * Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
  * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
  */
@@ -14,9 +15,6 @@
 #include <asm/pgtable.h>
 #include <asm/mtrr.h>
 
-/* References to section boundaries */
-extern const void __nosave_begin, __nosave_end;
-
 static void fix_processor_context(void);
 
 struct saved_context saved_context;
@@ -166,155 +164,3 @@ static void fix_processor_context(void)
                 loaddebug(&current->thread, 7);
 	}
 }
-
-#ifdef CONFIG_HIBERNATION
-/* Defined in arch/x86_64/kernel/suspend_asm.S */
-extern int restore_image(void);
-
-/*
- * Address to jump to in the last phase of restore in order to get to the image
- * kernel's text (this value is passed in the image header).
- */
-unsigned long restore_jump_address;
-
-/*
- * Value of the cr3 register from before the hibernation (this value is passed
- * in the image header).
- */
-unsigned long restore_cr3;
-
-pgd_t *temp_level4_pgt;
-
-void *relocated_restore_code;
-
-static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
-{
-	long i, j;
-
-	i = pud_index(address);
-	pud = pud + i;
-	for (; i < PTRS_PER_PUD; pud++, i++) {
-		unsigned long paddr;
-		pmd_t *pmd;
-
-		paddr = address + i*PUD_SIZE;
-		if (paddr >= end)
-			break;
-
-		pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
-		if (!pmd)
-			return -ENOMEM;
-		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
-		for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
-			unsigned long pe;
-
-			if (paddr >= end)
-				break;
-			pe = __PAGE_KERNEL_LARGE_EXEC | paddr;
-			pe &= __supported_pte_mask;
-			set_pmd(pmd, __pmd(pe));
-		}
-	}
-	return 0;
-}
-
-static int set_up_temporary_mappings(void)
-{
-	unsigned long start, end, next;
-	int error;
-
-	temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
-	if (!temp_level4_pgt)
-		return -ENOMEM;
-
-	/* It is safe to reuse the original kernel mapping */
-	set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
-		init_level4_pgt[pgd_index(__START_KERNEL_map)]);
-
-	/* Set up the direct mapping from scratch */
-	start = (unsigned long)pfn_to_kaddr(0);
-	end = (unsigned long)pfn_to_kaddr(end_pfn);
-
-	for (; start < end; start = next) {
-		pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
-		if (!pud)
-			return -ENOMEM;
-		next = start + PGDIR_SIZE;
-		if (next > end)
-			next = end;
-		if ((error = res_phys_pud_init(pud, __pa(start), __pa(next))))
-			return error;
-		set_pgd(temp_level4_pgt + pgd_index(start),
-			mk_kernel_pgd(__pa(pud)));
-	}
-	return 0;
-}
-
-int swsusp_arch_resume(void)
-{
-	int error;
-
-	/* We have got enough memory and from now on we cannot recover */
-	if ((error = set_up_temporary_mappings()))
-		return error;
-
-	relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
-	if (!relocated_restore_code)
-		return -ENOMEM;
-	memcpy(relocated_restore_code, &core_restore_code,
-	       &restore_registers - &core_restore_code);
-
-	restore_image();
-	return 0;
-}
-
-/*
- *	pfn_is_nosave - check if given pfn is in the 'nosave' section
- */
-
-int pfn_is_nosave(unsigned long pfn)
-{
-	unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
-	unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
-	return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
-}
-
-struct restore_data_record {
-	unsigned long jump_address;
-	unsigned long cr3;
-	unsigned long magic;
-};
-
-#define RESTORE_MAGIC	0x0123456789ABCDEFUL
-
-/**
- *	arch_hibernation_header_save - populate the architecture specific part
- *		of a hibernation image header
- *	@addr: address to save the data at
- */
-int arch_hibernation_header_save(void *addr, unsigned int max_size)
-{
-	struct restore_data_record *rdr = addr;
-
-	if (max_size < sizeof(struct restore_data_record))
-		return -EOVERFLOW;
-	rdr->jump_address = restore_jump_address;
-	rdr->cr3 = restore_cr3;
-	rdr->magic = RESTORE_MAGIC;
-	return 0;
-}
-
-/**
- *	arch_hibernation_header_restore - read the architecture specific data
- *		from the hibernation image header
- *	@addr: address to read the data from
- */
-int arch_hibernation_header_restore(void *addr)
-{
-	struct restore_data_record *rdr = addr;
-
-	restore_jump_address = rdr->jump_address;
-	restore_cr3 = rdr->cr3;
-	return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
-}
-#endif /* CONFIG_HIBERNATION */

arch/x86/power/suspend.c → arch/x86/power/hibernate_32.c

 /*
- * Suspend support specific for i386 - temporary page tables
+ * Hibernation support specific for i386 - temporary page tables
  *
  * Distribute under GPLv2
  *
@@ -13,7 +13,7 @@
 #include <asm/page.h>
 #include <asm/pgtable.h>
 
-/* Defined in arch/i386/power/swsusp.S */
+/* Defined in hibernate_asm_32.S */
 extern int restore_image(void);
 
 /* References to section boundaries */
@@ -23,7 +23,7 @@ extern const void __nosave_begin, __nosave_end;
 pgd_t *resume_pg_dir;
 
 /* The following three functions are based on the analogous code in
- * arch/i386/mm/init.c
+ * arch/x86/mm/init_32.c
  */
 
 /*

arch/x86/power/hibernate_64.c

+/*
+ * Hibernation support for x86-64
+ *
+ * Distribute under GPLv2
+ *
+ * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
+ * Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
+ */
+
+#include <linux/smp.h>
+#include <linux/suspend.h>
+#include <asm/proto.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/mtrr.h>
+
+/* References to section boundaries */
+extern const void __nosave_begin, __nosave_end;
+
+/* Defined in hibernate_asm_64.S */
+extern int restore_image(void);
+
+/*
+ * Address to jump to in the last phase of restore in order to get to the image
+ * kernel's text (this value is passed in the image header).
+ */
+unsigned long restore_jump_address;
+
+/*
+ * Value of the cr3 register from before the hibernation (this value is passed
+ * in the image header).
+ */
+unsigned long restore_cr3;
+
+pgd_t *temp_level4_pgt;
+
+void *relocated_restore_code;
+
+static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
+{
+	long i, j;
+
+	i = pud_index(address);
+	pud = pud + i;
+	for (; i < PTRS_PER_PUD; pud++, i++) {
+		unsigned long paddr;
+		pmd_t *pmd;
+
+		paddr = address + i*PUD_SIZE;
+		if (paddr >= end)
+			break;
+
+		pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
+		if (!pmd)
+			return -ENOMEM;
+		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
+		for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
+			unsigned long pe;
+
+			if (paddr >= end)
+				break;
+			pe = __PAGE_KERNEL_LARGE_EXEC | paddr;
+			pe &= __supported_pte_mask;
+			set_pmd(pmd, __pmd(pe));
+		}
+	}
+	return 0;
+}
+
+static int set_up_temporary_mappings(void)
+{
+	unsigned long start, end, next;
+	int error;
+
+	temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
+	if (!temp_level4_pgt)
+		return -ENOMEM;
+
+	/* It is safe to reuse the original kernel mapping */
+	set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
+		init_level4_pgt[pgd_index(__START_KERNEL_map)]);
+
+	/* Set up the direct mapping from scratch */
+	start = (unsigned long)pfn_to_kaddr(0);
+	end = (unsigned long)pfn_to_kaddr(end_pfn);
+
+	for (; start < end; start = next) {
+		pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
+		if (!pud)
+			return -ENOMEM;
+		next = start + PGDIR_SIZE;
+		if (next > end)
+			next = end;
+		if ((error = res_phys_pud_init(pud, __pa(start), __pa(next))))
+			return error;
+		set_pgd(temp_level4_pgt + pgd_index(start),
+			mk_kernel_pgd(__pa(pud)));
+	}
+	return 0;
+}
+
+int swsusp_arch_resume(void)
+{
+	int error;
+
+	/* We have got enough memory and from now on we cannot recover */
+	if ((error = set_up_temporary_mappings()))
+		return error;
+
+	relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
+	if (!relocated_restore_code)
+		return -ENOMEM;
+	memcpy(relocated_restore_code, &core_restore_code,
+	       &restore_registers - &core_restore_code);
+
+	restore_image();
+	return 0;
+}
+
+/*
+ *	pfn_is_nosave - check if given pfn is in the 'nosave' section
+ */
+
+int pfn_is_nosave(unsigned long pfn)
+{
+	unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
+	unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
+	return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+}
+
+struct restore_data_record {
+	unsigned long jump_address;
+	unsigned long cr3;
+	unsigned long magic;
+};
+
+#define RESTORE_MAGIC	0x0123456789ABCDEFUL
+
+/**
+ *	arch_hibernation_header_save - populate the architecture specific part
+ *		of a hibernation image header
+ *	@addr: address to save the data at
+ */
+int arch_hibernation_header_save(void *addr, unsigned int max_size)
+{
+	struct restore_data_record *rdr = addr;
+
+	if (max_size < sizeof(struct restore_data_record))
+		return -EOVERFLOW;
+	rdr->jump_address = restore_jump_address;
+	rdr->cr3 = restore_cr3;
+	rdr->magic = RESTORE_MAGIC;
+	return 0;
+}
+
+/**
+ *	arch_hibernation_header_restore - read the architecture specific data
+ *		from the hibernation image header
+ *	@addr: address to read the data from
+ */
+int arch_hibernation_header_restore(void *addr)
+{
+	struct restore_data_record *rdr = addr;
+
+	restore_jump_address = rdr->jump_address;
+	restore_cr3 = rdr->cr3;
+	return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
+}

arch/x86/power/swsusp.S → arch/x86/power/hibernate_asm_32.S

 .text
 
-/* Originally gcc generated, modified by hand
- *
+/*
  * This may not use any stack, nor any variable that is not "NoSave":
  *
  * Its rewriting one kernel image with another. What is stack in "old"

arch/x86/kernel/suspend_asm_64.S → arch/x86/power/hibernate_asm_64.S

-/* Copyright 2004,2005 Pavel Machek <pavel@suse.cz>, Andi Kleen <ak@suse.de>, Rafael J. Wysocki <rjw@sisk.pl>
+/*
+ * Hibernation support for x86-64
  *
  * Distribute under GPLv2.
  *
+ * Copyright 2007 Rafael J. Wysocki <rjw@sisk.pl>
+ * Copyright 2005 Andi Kleen <ak@suse.de>
+ * Copyright 2004 Pavel Machek <pavel@suse.cz>
+ *
  * swsusp_arch_resume must not use any stack or any nonlocal variables while
  * copying pages:
  *

arch/x86/xen/mmu.c

@@ -58,7 +58,7 @@
 
 xmaddr_t arbitrary_virt_to_machine(unsigned long address)
 {
-	int level;
+	unsigned int level;
 	pte_t *pte = lookup_address(address, &level);
 	unsigned offset = address & PAGE_MASK;
 
@@ -71,7 +71,7 @@ void make_lowmem_page_readonly(void *vaddr)
 {
 	pte_t *pte, ptev;
 	unsigned long address = (unsigned long)vaddr;
-	int level;
+	unsigned int level;
 
 	pte = lookup_address(address, &level);
 	BUG_ON(pte == NULL);
@@ -86,7 +86,7 @@ void make_lowmem_page_readwrite(void *vaddr)
 {
 	pte_t *pte, ptev;
 	unsigned long address = (unsigned long)vaddr;
-	int level;
+	unsigned int level;
 
 	pte = lookup_address(address, &level);
 	BUG_ON(pte == NULL);

arch/x86/xen/time.c

@@ -217,17 +217,17 @@ unsigned long long xen_sched_clock(void)
 /* Get the CPU speed from Xen */
 unsigned long xen_cpu_khz(void)
 {
-	u64 cpu_khz = 1000000ULL << 32;
+	u64 xen_khz = 1000000ULL << 32;
 	const struct vcpu_time_info *info =
 		&HYPERVISOR_shared_info->vcpu_info[0].time;
 
-	do_div(cpu_khz, info->tsc_to_system_mul);
+	do_div(xen_khz, info->tsc_to_system_mul);
 	if (info->tsc_shift < 0)
-		cpu_khz <<= -info->tsc_shift;
+		xen_khz <<= -info->tsc_shift;
 	else
-		cpu_khz >>= info->tsc_shift;
+		xen_khz >>= info->tsc_shift;
 
-	return cpu_khz;
+	return xen_khz;
 }
 
 /*

drivers/acpi/bus.c

@@ -31,6 +31,7 @@
 #include <linux/pm.h>
 #include <linux/device.h>
 #include <linux/proc_fs.h>
+#include <linux/acpi.h>
 #ifdef CONFIG_X86
 #include <asm/mpspec.h>
 #endif
@@ -39,9 +40,6 @@
 
 #define _COMPONENT		ACPI_BUS_COMPONENT
 ACPI_MODULE_NAME("bus");
-#ifdef	CONFIG_X86
-extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
-#endif
 
 struct acpi_device *acpi_root;
 struct proc_dir_entry *acpi_root_dir;
@@ -653,8 +651,6 @@ void __init acpi_early_init(void)
 
 #ifdef CONFIG_X86
 	if (!acpi_ioapic) {
-		extern u8 acpi_sci_flags;
-
 		/* compatible (0) means level (3) */
 		if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 			acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
@@ -664,7 +660,6 @@ void __init acpi_early_init(void)
 		acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 					 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 	} else {
-		extern int acpi_sci_override_gsi;
 		/*
 		 * now that acpi_gbl_FADT is initialized,
 		 * update it with result from INT_SRC_OVR parsing

drivers/lguest/page_tables.c

@@ -178,8 +178,8 @@ static void release_pte(pte_t pte)
 
 static void check_gpte(struct lg_cpu *cpu, pte_t gpte)
 {
-	if ((pte_flags(gpte) & (_PAGE_PWT|_PAGE_PSE))
-	    || pte_pfn(gpte) >= cpu->lg->pfn_limit)
+	if ((pte_flags(gpte) & _PAGE_PSE) ||
+	    pte_pfn(gpte) >= cpu->lg->pfn_limit)
 		kill_guest(cpu, "bad page table entry");
 }
 

include/asm-x86/acpi.h

@@ -89,6 +89,10 @@ extern int acpi_pci_disabled;
 extern int acpi_skip_timer_override;
 extern int acpi_use_timer_override;
 
+extern u8 acpi_sci_flags;
+extern int acpi_sci_override_gsi;
+void acpi_pic_sci_set_trigger(unsigned int, u16);
+
 static inline void disable_acpi(void)
 {
 	acpi_disabled = 1;

include/asm-x86/cacheflush.h

@@ -44,6 +44,8 @@ int set_memory_np(unsigned long addr, int numpages);
 
 void clflush_cache_range(void *addr, unsigned int size);
 
+void cpa_init(void);
+
 #ifdef CONFIG_DEBUG_RODATA
 void mark_rodata_ro(void);
 #endif

include/asm-x86/geode.h

@@ -206,12 +206,17 @@ static inline u16 geode_mfgpt_read(int timer, u16 reg)
 	return inw(base + reg + (timer * 8));
 }
 
-extern int __init geode_mfgpt_detect(void);
 extern int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable);
 extern int geode_mfgpt_set_irq(int timer, int cmp, int irq, int enable);
-extern int geode_mfgpt_alloc_timer(int timer, int domain, struct module *owner);
+extern int geode_mfgpt_alloc_timer(int timer, int domain);
 
 #define geode_mfgpt_setup_irq(t, c, i) geode_mfgpt_set_irq((t), (c), (i), 1)
 #define geode_mfgpt_release_irq(t, c, i) geode_mfgpt_set_irq((t), (c), (i), 0)
 
+#ifdef CONFIG_GEODE_MFGPT_TIMER
+extern int __init mfgpt_timer_setup(void);
+#else
+static inline int mfgpt_timer_setup(void) { return 0; }
+#endif
+
 #endif

include/asm-x86/page_32.h

@@ -48,7 +48,6 @@ typedef unsigned long	pgprotval_t;
 typedef unsigned long	phys_addr_t;
 
 typedef union { pteval_t pte, pte_low; } pte_t;
-typedef pte_t boot_pte_t;
 
 #endif	/* __ASSEMBLY__ */
 #endif	/* CONFIG_X86_PAE */

include/asm-x86/pgtable.h

@@ -255,7 +255,7 @@ enum {
  * NOTE: the return type is pte_t but if the pmd is PSE then we return it
  * as a pte too.
  */
-extern pte_t *lookup_address(unsigned long address, int *level);
+extern pte_t *lookup_address(unsigned long address, unsigned int *level);
 
 /* local pte updates need not use xchg for locking */
 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)

include/asm-x86/pgtable_32.h

@@ -52,10 +52,6 @@ void paging_init(void);
 #define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
 #define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
 
-#define TWOLEVEL_PGDIR_SHIFT	22
-#define BOOT_USER_PGD_PTRS (__PAGE_OFFSET >> TWOLEVEL_PGDIR_SHIFT)
-#define BOOT_KERNEL_PGD_PTRS (1024-BOOT_USER_PGD_PTRS)
-
 /* Just any arbitrary offset to the start of the vmalloc VM area: the
  * current 8MB value just means that there will be a 8MB "hole" after the
  * physical memory until the kernel virtual memory starts.  That means that

include/linux/compiler-gcc4.h

@@ -5,15 +5,6 @@
 /* These definitions are for GCC v4.x.  */
 #include <linux/compiler-gcc.h>
 
-#ifdef CONFIG_FORCED_INLINING
-# undef inline
-# undef __inline__
-# undef __inline
-# define inline			inline		__attribute__((always_inline))
-# define __inline__		__inline__	__attribute__((always_inline))
-# define __inline		__inline	__attribute__((always_inline))
-#endif
-
 #define __used			__attribute__((__used__))
 #define __must_check 		__attribute__((warn_unused_result))
 #define __compiler_offsetof(a,b) __builtin_offsetof(a,b)

init/Kconfig

@@ -587,7 +587,7 @@ config COMPAT_BRK
 	  disabled, and can be overriden runtime by setting
 	  /proc/sys/kernel/randomize_va_space to 2.
 
-	  On non-ancient distros (post-2000 ones) Y is usually a safe choice.
+	  On non-ancient distros (post-2000 ones) N is usually a safe choice.
 
 config BASE_FULL
 	default y

init/main.c

@@ -558,7 +558,6 @@ asmlinkage void __init start_kernel(void)
 	preempt_disable();
 	build_all_zonelists();
 	page_alloc_init();
-	enable_debug_pagealloc();
 	printk(KERN_NOTICE "Kernel command line: %s\n", boot_command_line);
 	parse_early_param();
 	parse_args("Booting kernel", static_command_line, __start___param,
@@ -614,6 +613,7 @@ asmlinkage void __init start_kernel(void)
 	vfs_caches_init_early();
 	cpuset_init_early();
 	mem_init();
+	enable_debug_pagealloc();
 	cpu_hotplug_init();
 	kmem_cache_init();
 	setup_per_cpu_pageset();

lib/Kconfig.debug

@@ -465,20 +465,6 @@ config FRAME_POINTER
 	  some architectures or if you use external debuggers.
 	  If you don't debug the kernel, you can say N.
 
-config FORCED_INLINING
-	bool "Force gcc to inline functions marked 'inline'"
-	depends on DEBUG_KERNEL
-	default y
-	help
-	  This option determines if the kernel forces gcc to inline the functions
-	  developers have marked 'inline'. Doing so takes away freedom from gcc to
-	  do what it thinks is best, which is desirable for the gcc 3.x series of
-	  compilers. The gcc 4.x series have a rewritten inlining algorithm and
-	  disabling this option will generate a smaller kernel there. Hopefully
-	  this algorithm is so good that allowing gcc4 to make the decision can
-	  become the default in the future, until then this option is there to
-	  test gcc for this.
-
 config BOOT_PRINTK_DELAY
 	bool "Delay each boot printk message by N milliseconds"
 	depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY

lib/vsprintf.c

@@ -26,6 +26,9 @@
 #include <asm/page.h>		/* for PAGE_SIZE */
 #include <asm/div64.h>
 
+/* Works only for digits and letters, but small and fast */
+#define TOLOWER(x) ((x) | 0x20)
+
 /**
  * simple_strtoul - convert a string to an unsigned long
  * @cp: The start of the string
@@ -41,17 +44,17 @@ unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
 		if (*cp == '0') {
 			base = 8;
 			cp++;
-			if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
+			if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) {
 				cp++;
 				base = 16;
 			}
 		}
 	} else if (base == 16) {
-		if (cp[0] == '0' && toupper(cp[1]) == 'X')
+		if (cp[0] == '0' && TOLOWER(cp[1]) == 'x')
 			cp += 2;
 	}
 	while (isxdigit(*cp) &&
-	       (value = isdigit(*cp) ? *cp-'0' : toupper(*cp)-'A'+10) < base) {
+	       (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) {
 		result = result*base + value;
 		cp++;
 	}
@@ -92,17 +95,17 @@ unsigned long long simple_strtoull(const char *cp,char **endp,unsigned int base)
 		if (*cp == '0') {
 			base = 8;
 			cp++;
-			if ((toupper(*cp) == 'X') && isxdigit(cp[1])) {
+			if ((TOLOWER(*cp) == 'x') && isxdigit(cp[1])) {
 				cp++;
 				base = 16;
 			}
 		}
 	} else if (base == 16) {
-		if (cp[0] == '0' && toupper(cp[1]) == 'X')
+		if (cp[0] == '0' && TOLOWER(cp[1]) == 'x')
 			cp += 2;
 	}
-	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
-	    ? toupper(*cp) : *cp)-'A'+10) < base) {
+	while (isxdigit(*cp)
+	 && (value = isdigit(*cp) ? *cp-'0' : TOLOWER(*cp)-'a'+10) < base) {
 		result = result*base + value;
 		cp++;
 	}
@@ -360,24 +363,25 @@ static noinline char* put_dec(char *buf, unsigned long long num)
 #define PLUS	4		/* show plus */
 #define SPACE	8		/* space if plus */
 #define LEFT	16		/* left justified */
-#define SPECIAL	32		/* 0x */
-#define LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */
+#define SMALL	32		/* Must be 32 == 0x20 */
+#define SPECIAL	64		/* 0x */
 
 static char *number(char *buf, char *end, unsigned long long num, int base, int size, int precision, int type)
 {
-	char sign,tmp[66];
-	const char *digits;
-	/* we are called with base 8, 10 or 16, only, thus don't need "g..."  */
-	static const char small_digits[] = "0123456789abcdefx"; /* "ghijklmnopqrstuvwxyz"; */
-	static const char large_digits[] = "0123456789ABCDEFX"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
+	/* we are called with base 8, 10 or 16, only, thus don't need "G..."  */
+	static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
+
+	char tmp[66];
+	char sign;
+	char locase;
 	int need_pfx = ((type & SPECIAL) && base != 10);
 	int i;
 
-	digits = (type & LARGE) ? large_digits : small_digits;
+	/* locase = 0 or 0x20. ORing digits or letters with 'locase'
+	 * produces same digits or (maybe lowercased) letters */
+	locase = (type & SMALL);
 	if (type & LEFT)
 		type &= ~ZEROPAD;
-	if (base < 2 || base > 36)
-		return NULL;
 	sign = 0;
 	if (type & SIGN) {
 		if ((signed long long) num < 0) {
@@ -404,7 +408,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
 		tmp[i++] = '0';
 	/* Generic code, for any base:
 	else do {
-		tmp[i++] = digits[do_div(num,base)];
+		tmp[i++] = (digits[do_div(num,base)] | locase);
 	} while (num != 0);
 	*/
 	else if (base != 10) { /* 8 or 16 */
@@ -412,7 +416,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
 		int shift = 3;
 		if (base == 16) shift = 4;
 		do {
-			tmp[i++] = digits[((unsigned char)num) & mask];
+			tmp[i++] = (digits[((unsigned char)num) & mask] | locase);
 			num >>= shift;
 		} while (num);
 	} else { /* base 10 */
@@ -444,7 +448,7 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
 		++buf;
 		if (base == 16) {
 			if (buf < end)
-				*buf = digits[16]; /* for arbitrary base: digits[33]; */
+				*buf = ('X' | locase);
 			++buf;
 		}
 	}
@@ -644,6 +648,7 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 				continue;
 
 			case 'p':
+				flags |= SMALL;
 				if (field_width == -1) {
 					field_width = 2*sizeof(void *);
 					flags |= ZEROPAD;
@@ -680,9 +685,9 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 				base = 8;
 				break;
 
-			case 'X':
-				flags |= LARGE;
 			case 'x':
+				flags |= SMALL;
+			case 'X':
 				base = 16;
 				break;