luck/tmp_suning_uos_patched
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Add new HEAD_TEXT_SECTION macro.

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This patch is preparation for replacing all uses of ".head.text" or
".text.head" in the kernel with macros, so that the section name can
later be changed without having to touch a lot of the kernel.

Since some linker scripts do more complex things than referencing
HEAD_TEXT, we add a HEAD_TEXT_SECTION macro that just contains the
actual name.

I've defined HEAD_TEXT_SECTION in a new header,
include/linux/section-names.h, so that this section name only needs to
appear in one place.  I anticipate creating similar macro structures
for a number of other section names.

The long-term goal here is to be able to change the kernel's magic
section names to those that are compatible with -ffunction-sections
-fdata-sections.  This requires renaming all magic sections with names
of the form ".text.foo".

Signed-off-by: Tim Abbott <tabbott@mit.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tim Abbott 2009-04-25 22:10:56 -04:00 committed by Linus Torvalds
parent 0c8454f566
commit c80d471a47
3 changed files with 12 additions and 2 deletions
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4
include/asm-generic/vmlinux.lds.h
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@ -1,3 +1,5 @@
#include <linux/section-names.h>
#ifndef LOAD_OFFSET
#define LOAD_OFFSET 0
#endif
@ -331,7 +333,7 @@
#endif
/* Section used for early init (in .S files) */
#define HEAD_TEXT *(.head.text)
#define HEAD_TEXT *(HEAD_TEXT_SECTION)
/* init and exit section handling */
#define INIT_DATA \

4
include/linux/init.h
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@ -2,6 +2,8 @@
#define _LINUX_INIT_H
#include <linux/compiler.h>
#include <linux/section-names.h>
#include <linux/stringify.h>
/* These macros are used to mark some functions or
* initialized data (doesn't apply to uninitialized data)
@ -107,7 +109,7 @@
#define __memexitconst __section(.memexit.rodata)
/* For assembly routines */
#define __HEAD .section ".head.text","ax"
#define __HEAD .section __stringify(HEAD_TEXT_SECTION),"ax"
#define __INIT .section ".init.text","ax"
#define __FINIT .previous

6
include/linux/section-names.h Normal file
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@ -0,0 +1,6 @@
#ifndef __LINUX_SECTION_NAMES_H
#define __LINUX_SECTION_NAMES_H
#define HEAD_TEXT_SECTION .head.text
#endif /* !__LINUX_SECTION_NAMES_H */