x86, vmlinux.lds: unify first part of initdata

32-bit:

 - Move definition of __init_begin outside output_section
   because it covers more than one section
 - Move ALIGN() for end-of-section inside .smp_locks output section.
   Same effect but the intent is better documented that
   we need both start and end aligned.

64-bit:

 - Move ALIGN() outside output section in .init.setup
 - Deleted unused __smp_alt_* symbols

None of the above should result in any functional change.

[ Impact: refactor and unify linker script ]
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Tim Abbott <tabbott@MIT.EDU>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1240991249-27117-9-git-send-email-sam@ravnborg.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/vmlinux.lds.S

@@ -231,6 +231,67 @@ SECTIONS
 
 #endif /* CONFIG_X86_64 */
 
+	/* init_task */
+	. = ALIGN(THREAD_SIZE);
+	.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
+		*(.data.init_task)
+	}
+#ifdef CONFIG_X86_64
+	 :data.init
+#endif
+
+	/*
+	 * smp_locks might be freed after init
+	 * start/end must be page aligned
+	 */
+	. = ALIGN(PAGE_SIZE);
+	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
+		__smp_locks = .;
+		*(.smp_locks)
+		__smp_locks_end = .;
+		. = ALIGN(PAGE_SIZE);
+	}
+
+	/* Init code and data - will be freed after init */
+	. = ALIGN(PAGE_SIZE);
+	__init_begin = .; /* paired with __init_end */
+	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
+		_sinittext = .;
+		INIT_TEXT
+		_einittext = .;
+	}
+
+	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
+		INIT_DATA
+	}
+
+	. = ALIGN(16);
+	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
+		__setup_start = .;
+		*(.init.setup)
+		__setup_end = .;
+	}
+	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
+		__initcall_start = .;
+		INITCALLS
+		__initcall_end = .;
+	}
+
+	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
+		__con_initcall_start = .;
+		*(.con_initcall.init)
+		__con_initcall_end = .;
+	}
+
+	.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
+		__x86_cpu_dev_start = .;
+		*(.x86_cpu_dev.init)
+		__x86_cpu_dev_end = .;
+	}
+
+	SECURITY_INIT
+
+
 #ifdef CONFIG_X86_32
 # include "vmlinux_32.lds.S"
 #else

arch/x86/kernel/vmlinux_32.lds.S

-	/* init_task */
-	. = ALIGN(THREAD_SIZE);
-	.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
-		*(.data.init_task)
-	}
-
-	. = ALIGN(PAGE_SIZE);
-	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
-		/* might get freed after init */
-		__smp_locks = .;
-		*(.smp_locks)
-		__smp_locks_end = .;
-	}
-	/* will be freed after init
-	 * Following ALIGN() is required to make sure no other data falls on the
-	 * same page where __smp_alt_end is pointing as that page might be freed
-	 * after boot. Always make sure that ALIGN() directive is present after
-	 * the section which contains __smp_alt_end.
-	 */
-	. = ALIGN(PAGE_SIZE);
-
-	/* Init code and data - will be freed after init */
-	. = ALIGN(PAGE_SIZE);
-	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
-		__init_begin = .;
-		_sinittext = .;
-		INIT_TEXT
-		_einittext = .;
-	}
-
-	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
-		INIT_DATA
-	}
-
-	. = ALIGN(16);
-	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
-		__setup_start = .;
-		*(.init.setup)
-		__setup_end = .;
-	}
-	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
-		__initcall_start = .;
-		INITCALLS
-		__initcall_end = .;
-	}
-
-	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
-		__con_initcall_start = .;
-		*(.con_initcall.init)
-		__con_initcall_end = .;
-	}
-
-	.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
-		__x86_cpu_dev_start = .;
-		*(.x86_cpu_dev.init)
-		__x86_cpu_dev_end = .;
-	}
-
-	SECURITY_INIT
-
 	. = ALIGN(4);
 	.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
 		__alt_instructions = .;

arch/x86/kernel/vmlinux_64.lds.S

-	/* init_task */
-	.data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
-		. = ALIGN(THREAD_SIZE);
-		*(.data.init_task)
-	} :data.init
-
-	.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
-		/* might get freed after init */
-		. = ALIGN(PAGE_SIZE);
-		__smp_alt_begin = .;
-		__smp_locks = .;
-		*(.smp_locks)
-		__smp_locks_end = .;
-		. = ALIGN(PAGE_SIZE);
-		__smp_alt_end = .;
-	}
-
-	/* Init code and data */
-	. = ALIGN(PAGE_SIZE);
-	__init_begin = .;	/* paired with __init_end */
-	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
-		_sinittext = .;
-		INIT_TEXT
-		_einittext = .;
-	}
-
-	.init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
-		__initdata_begin = .;
-		INIT_DATA
-		__initdata_end = .;
-	}
-
-	.init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
-		. = ALIGN(16);
-		__setup_start = .;
-		*(.init.setup)
-		__setup_end = .;
-	}
-
-	.initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
-		__initcall_start = .;
-		INITCALLS
-		__initcall_end = .;
-	}
-
-	.con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
-		__con_initcall_start = .;
-		*(.con_initcall.init)
-		__con_initcall_end = .;
-	}
-
-	.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
-		__x86_cpu_dev_start = .;
-		*(.x86_cpu_dev.init)
-		__x86_cpu_dev_end = .;
-	}
-
-	SECURITY_INIT
-
 	. = ALIGN(8);
 	.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
 		__parainstructions = .;