powerpc: Merge asm-ppc/kexec.h and asm-ppc64/kexec.h

Merge include/asm-ppc/kexec.h and include/asm-ppc64/kexec.h.

The only thing that's really changed is that we now allocate crash_notes
properly on PPC32. It's address is exported via sysfs, so it's not correct
for it to be a pointer.

I've also removed some of the "we don't use this" comments, because they're
wrong (or perhaps were referring only to arch code).
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>

arch/ppc/kernel/machine_kexec.c

@@ -32,7 +32,7 @@ const extern unsigned int relocate_new_kernel_size;
  * Provide a dummy crash_notes definition while crash dump arrives to ppc.
  * This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
  */
-void *crash_notes = NULL;
+note_buf_t crash_notes[NR_CPUS];
 
 void machine_shutdown(void)
 {

include/asm-ppc64/kexec.h → include/asm-powerpc/kexec.h

-#ifndef _PPC64_KEXEC_H
-#define _PPC64_KEXEC_H
+#ifndef _ASM_POWERPC_KEXEC_H
+#define _ASM_POWERPC_KEXEC_H
 
 /*
- * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
- * I.e. Maximum page that is mapped directly into kernel memory,
- * and kmap is not required.
+ * Maximum page that is mapped directly into kernel memory.
+ * XXX: Since we copy virt we can use any page we allocate
  */
-
-/* Maximum physical address we can use pages from */
-/* XXX: since we copy virt we can use any page we allocate */
 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
 
-/* Maximum address we can reach in physical address mode */
-/* XXX: I want to allow initrd in highmem.  otherwise set to rmo on lpar */
+/*
+ * Maximum address we can reach in physical address mode.
+ * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
+ */
 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
 
 /* Maximum address we can use for the control code buffer */
-/* XXX: unused today, ppc32 uses TASK_SIZE, probably left over from use_mm  */
+#ifdef __powerpc64__
 #define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
+#else
+/* TASK_SIZE, probably left over from use_mm ?? */
+#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
+#endif
 
-/* XXX: today we don't use this at all, althogh we have a static stack */
 #define KEXEC_CONTROL_CODE_SIZE 4096
 
 /* The native architecture */
+#ifdef __powerpc64__
 #define KEXEC_ARCH KEXEC_ARCH_PPC64
-
-#define MAX_NOTE_BYTES 1024
+#else
+#define KEXEC_ARCH KEXEC_ARCH_PPC
+#endif
 
 #ifndef __ASSEMBLY__
 
-typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
+#define MAX_NOTE_BYTES 1024
+typedef u32 note_buf_t[MAX_NOTE_BYTES / sizeof(u32)];
 
 extern note_buf_t crash_notes[];
 
+#ifdef __powerpc64__
 extern void kexec_smp_wait(void);	/* get and clear naca physid, wait for
 					  master to copy new code to 0 */
+#else
+struct kimage;
+extern void machine_kexec_simple(struct kimage *image);
+#endif
 
-#endif /* __ASSEMBLY__ */
-#endif /* _PPC_KEXEC_H */
-
+#endif /* ! __ASSEMBLY__ */
+#endif /* _ASM_POWERPC_KEXEC_H */

include/asm-ppc/kexec.h

-#ifndef _PPC_KEXEC_H
-#define _PPC_KEXEC_H
-
-#ifdef CONFIG_KEXEC
-
-/*
- * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
- * I.e. Maximum page that is mapped directly into kernel memory,
- * and kmap is not required.
- *
- * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
- * calculation for the amount of memory directly mappable into the
- * kernel memory space.
- */
-
-/* Maximum physical address we can use pages from */
-#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
-/* Maximum address we can reach in physical address mode */
-#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
-/* Maximum address we can use for the control code buffer */
-#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
-
-#define KEXEC_CONTROL_CODE_SIZE	4096
-
-/* The native architecture */
-#define KEXEC_ARCH KEXEC_ARCH_PPC
-
-#ifndef __ASSEMBLY__
-
-extern void *crash_notes;
-
-struct kimage;
-
-extern void machine_kexec_simple(struct kimage *image);
-
-#endif /* __ASSEMBLY__ */
-
-#endif /* CONFIG_KEXEC */
-
-#endif /* _PPC_KEXEC_H */