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Commit d338c73c authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Ingo Molnar
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x86: add memory clobber to save/loadsegment 



Add "memory" clobbers to savesegment and loadsegment, since they can
affect memory accesses and we never want the compiler to reorder them
with respect to memory references.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent bea41808

include/asm-x86/system.h

+2 −2
Original line number Diff line number Diff line
@@ -153,14 +153,14 @@ extern void load_gs_index(unsigned); 
		     "jmp 2b\n"			\

		     ".previous\n"		\

		     _ASM_EXTABLE(1b,3b)	\

		     : :"r" (value), "r" (0))

		     : :"r" (value), "r" (0) : "memory")





/*

 * Save a segment register away

 */

#define savesegment(seg, value)				\

	asm volatile("mov %%" #seg ",%0":"=rm" (value))

	asm("mov %%" #seg ",%0":"=rm" (value) : : "memory")



static inline unsigned long get_limit(unsigned long segment)

{