x86, vmlinux.lds: unify remaining parts

32 bit:
- explicit page align .bss
- move ALING() out of .brk output section
- discard *(.eh_frame)

64 bit:
- move ALIGN() out of .bss output section
- move ALIGN() out of .brk output section
- use a dedicated section to define _end

[ Impact: unify and fix section alignments in linker script ]
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Tim Abbott <tabbott@MIT.EDU>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1240991249-27117-13-git-send-email-sam@ravnborg.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/vmlinux.lds.S

@@ -359,12 +359,34 @@ SECTIONS
 	/* use another section data.init2, see PERCPU_VADDR() above */
 #endif
 
+	/* BSS */
+	. = ALIGN(PAGE_SIZE);
+	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
+		__bss_start = .;
+		*(.bss.page_aligned)
+		*(.bss)
+		. = ALIGN(4);
+		__bss_stop = .;
+	}
 
-#ifdef CONFIG_X86_32
-# include "vmlinux_32.lds.S"
-#else
-# include "vmlinux_64.lds.S"
-#endif
+	. = ALIGN(PAGE_SIZE);
+	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
+		__brk_base = .;
+		. += 64 * 1024;		/* 64k alignment slop space */
+		*(.brk_reservation)	/* areas brk users have reserved */
+		__brk_limit = .;
+	}
+
+	.end : AT(ADDR(.end) - LOAD_OFFSET) {
+		_end = .;
+	}
+
+	/* Sections to be discarded */
+	/DISCARD/ : {
+		*(.exitcall.exit)
+		*(.eh_frame)
+		*(.discard)
+	}
 
         STABS_DEBUG
         DWARF_DEBUG

arch/x86/kernel/vmlinux_32.lds.S

-	/* BSS */
-	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
-		__bss_start = .;
-		*(.bss.page_aligned)
-		*(.bss)
-		. = ALIGN(4);
-		__bss_stop = .;
-	}
-
-	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
-		. = ALIGN(PAGE_SIZE);
-		__brk_base = .;
-		. += 64 * 1024;		/* 64k alignment slop space */
-		*(.brk_reservation)	/* areas brk users have reserved */
-		__brk_limit = .;
-	}
-
-	.end : AT(ADDR(.end) - LOAD_OFFSET) {
-		_end = . ;
-	}
-
-	/* Sections to be discarded */
-	/DISCARD/ : {
-		*(.exitcall.exit)
-		*(.discard)
-	}

arch/x86/kernel/vmlinux_64.lds.S

-	.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
-		. = ALIGN(PAGE_SIZE);
-		__bss_start = .;		/* BSS */
-		*(.bss.page_aligned)
-		*(.bss)
-		__bss_stop = .;
-	}
-
-	.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
-		. = ALIGN(PAGE_SIZE);
-		__brk_base = .;
-		. += 64 * 1024;		/* 64k alignment slop space */
-		*(.brk_reservation)	/* areas brk users have reserved */
-		__brk_limit = .;
-	}
-
-	_end = . ;
-
-	/* Sections to be discarded */
-	/DISCARD/ : {
-		*(.exitcall.exit)
-		*(.eh_frame)
-		*(.discard)
-	}