Commit d2af12ae authored Jun 23, 2009 by Tim Abbott Committed by Sam Ravnborg Jun 26, 2009

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



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>

parent 73f1d939

include/linux/linkage.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -21,6 +21,15 @@
		#define __page_aligned_data __section(.data.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
		* untouched by the compiler by keeping them live until the end.