Add new HEAD_TEXT_SECTION macro. (c80d471a) · Commits · 戴 / test

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>

include/asm-generic/vmlinux.lds.h

+3 −1

Original line number	Diff line number	Diff line
		#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 \

include/linux/init.h

+3 −1

Original line number	Diff line number	Diff line
		@@ -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

include/linux/section-names.h

0 → 100644

+6 −0

Original line number	Diff line number	Diff line
		#ifndef __LINUX_SECTION_NAMES_H
		#define __LINUX_SECTION_NAMES_H

		#define HEAD_TEXT_SECTION .head.text

		#endif /* !__LINUX_SECTION_NAMES_H */

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