Commit 33f8c40a authored Sep 14, 2008 by Vegard Nossum Committed by Ingo Molnar Oct 13, 2008

x86: add memory clobber in switch_to()



Segment registers are reloaded, so we should add a memory clobber. The
generated assembly code is identical in my tests, but this doesn't mean
it is necessarily true for all configurations/compilers.

x86_64 already has the memory clobber.

Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 3e6de5a3

include/asm-x86/system.h

+4 −1

Original line number	Diff line number	Diff line
		@@ -64,7 +64,10 @@ do { \
		\
		/* regparm parameters for __switch_to(): */ \
		[prev] "a" (prev), \
		[next] "d" (next)); \
		[next] "d" (next) \
		\
		: /* reloaded segment registers */ \
		"memory"); \
		} while (0)

		/*