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Add new macros for page-aligned data and bss sections.

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This patch is preparation for replacing most uses of
".bss.page_aligned" and ".data.page_aligned" in the kernel with
macros, so that the section name can later be changed without having
to touch a lot of the kernel.

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 ".data.foo".

Signed-off-by: Tim Abbott <tabbott@ksplice.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Tim Abbott 2009-06-23 19:59:35 -04:00 committed by Sam Ravnborg
parent 73f1d9391a
commit d2af12aead
1 changed files with 9 additions and 0 deletions
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9
include/linux/linkage.h
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@ -21,6 +21,15 @@
#define __page_aligned_data __section(.data.page_aligned) __aligned(PAGE_SIZE) #define __page_aligned_data __section(.data.page_aligned) __aligned(PAGE_SIZE)
#define __page_aligned_bss __section(.bss.page_aligned) __aligned(PAGE_SIZE) #define __page_aligned_bss __section(.bss.page_aligned) __aligned(PAGE_SIZE)
/*
* For assembly routines.
*
* Note when using these that you must specify the appropriate
* alignment directives yourself
*/
#define __PAGE_ALIGNED_DATA .section ".data.page_aligned", "aw"
#define __PAGE_ALIGNED_BSS .section ".bss.page_aligned", "aw"
/* /*
* This is used by architectures to keep arguments on the stack * This is used by architectures to keep arguments on the stack
* untouched by the compiler by keeping them live until the end. * untouched by the compiler by keeping them live until the end.