x86: Don't generate cmpxchg8b_emu if CONFIG_X86_CMPXCHG64=y (04edbdef) · Commits · 戴 / test

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>

arch/x86/kernel/i386_ksyms_32.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);

arch/x86/lib/Makefile

+4 −2

Original line number	Diff line number	Diff line
		@@ -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

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