[PATCH 1/2] section garbage collection for i386

[Denys Vlasenko <vda.linux@googlemail.com>]

Hi Sam,

This patch is preparatory: it adds a few KEEP() directives where
I forgot them in previous patch set, adds comments which explains
places where KEEP() is definitely not needed, and fixes i386 vdso generation
in an "obviously safe" way.

Please apply.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
--
vda

diff -urpN linux-2.6.23-rc4.gc4/arch/i386/kernel/vsyscall.lds.S linux-2.6.23-rc4.gc5/arch/i386/kernel/vsyscall.lds.S
--- linux-2.6.23-rc4.gc4/arch/i386/kernel/vsyscall.lds.S	2007-07-09 00:32:17.000000000 +0100
+++ linux-2.6.23-rc4.gc5/arch/i386/kernel/vsyscall.lds.S	2007-09-12 19:47:17.000000000 +0100
@@ -23,10 +23,10 @@ SECTIONS
      is insufficient, ld -shared will barf.  Just increase it here.  */
   . = VDSO_PRELINK_asm + 0x400;
 
-  .text           : { *(.text) }		:text =0x90909090
+  .text           : { *(.text) *(.text.*) }	:text =0x90909090
   .note		  : { *(.note.*) }		:text :note
   .eh_frame_hdr   : { *(.eh_frame_hdr) }	:text :eh_frame_hdr
-  .eh_frame       : { KEEP (*(.eh_frame)) }	:text
+  .eh_frame       : { KEEP(*(.eh_frame)) }	:text
   .dynamic        : { *(.dynamic) }		:text :dynamic
   .useless        : {
   	*(.got.plt) *(.got)
diff -urpN linux-2.6.23-rc4.gc4/include/asm-generic/vmlinux.lds.h linux-2.6.23-rc4.gc5/include/asm-generic/vmlinux.lds.h
--- linux-2.6.23-rc4.gc4/include/asm-generic/vmlinux.lds.h	2007-09-12 19:46:32.000000000 +0100
+++ linux-2.6.23-rc4.gc5/include/asm-generic/vmlinux.lds.h	2007-09-12 19:47:17.000000000 +0100
@@ -169,6 +169,7 @@
 #define SCHED_TEXT							\
 		ALIGN_FUNCTION();					\
 		VMLINUX_SYMBOL(__sched_text_start) = .;			\
+		/* No need to KEEP */					\
 		*(.sched.text)						\
 		VMLINUX_SYMBOL(__sched_text_end) = .;
 
@@ -177,12 +178,14 @@
 #define LOCK_TEXT							\
 		ALIGN_FUNCTION();					\
 		VMLINUX_SYMBOL(__lock_text_start) = .;			\
+		/* No need to KEEP */					\
 		*(.spinlock.text)					\
 		VMLINUX_SYMBOL(__lock_text_end) = .;
 
 #define KPROBES_TEXT							\
 		ALIGN_FUNCTION();					\
 		VMLINUX_SYMBOL(__kprobes_text_start) = .;		\
+		/* No need to KEEP */					\
 		*(.kprobes.text)					\
 		VMLINUX_SYMBOL(__kprobes_text_end) = .;
 
@@ -228,14 +231,16 @@
 	. = ALIGN(8);							\
 	__bug_table : AT(ADDR(__bug_table) - LOAD_OFFSET) {		\
 		__start___bug_table = .;				\
-		*(__bug_table)						\
+		/* Support for BUG() */					\
+		KEEP(*(__bug_table))					\
 		__stop___bug_table = .;					\
 	}
 
 #define NOTES								\
 	.notes : AT(ADDR(.notes) - LOAD_OFFSET) {			\
 		VMLINUX_SYMBOL(__start_notes) = .;			\
-		*(.note.*)						\
+		/* For /sys/kernel/notes */				\
+		KEEP(*(.note.*))					\
 		VMLINUX_SYMBOL(__stop_notes) = .;			\
 	}