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x86: Don't generate cmpxchg8b_emu if CONFIG_X86_CMPXCHG64=y

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Conditionaly compile cmpxchg8b_emu.o and EXPORT_SYMBOL(cmpxchg8b_emu).

This reduces the kernel size a bit.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <4AC43E7E.1000600@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Eric Dumazet 2009-10-01 07:30:38 +02:00 committed by Ingo Molnar
parent d1716a60a8
commit 04edbdef02
2 changed files with 6 additions and 2 deletions
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2
arch/x86/kernel/i386_ksyms_32.c
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@ -15,8 +15,10 @@ EXPORT_SYMBOL(mcount);
* the export, but dont use it from C code, it is used
* by assembly code and is not using C calling convention!
*/
#ifndef CONFIG_X86_CMPXCHG64
extern void cmpxchg8b_emu(void);
EXPORT_SYMBOL(cmpxchg8b_emu);
#endif
/* Networking helper routines. */
EXPORT_SYMBOL(csum_partial_copy_generic);

6
arch/x86/lib/Makefile
View file

@ -15,8 +15,10 @@ ifeq ($(CONFIG_X86_32),y)
obj-y += atomic64_32.o
lib-y += checksum_32.o
lib-y += strstr_32.o
lib-y += semaphore_32.o string_32.o cmpxchg8b_emu.o
lib-y += semaphore_32.o string_32.o
ifneq ($(CONFIG_X86_CMPXCHG64),y)
lib-y += cmpxchg8b_emu.o
endif
lib-$(CONFIG_X86_USE_3DNOW) += mmx_32.o
else
obj-y += io_64.o iomap_copy_64.o