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Introduce proper compiler barrier

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Define barrier() as optimization barrier and replace (potentially
unreliable) asm("") fences.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Jan Kiszka 2010-06-25 16:56:49 +02:00 • committed by Aurelien Jarno
parent 1e29a009e3
commit 1d93f0f03d
2 changed files with 6 additions and 2 deletions
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3
qemu-barrier.h
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@ -4,4 +4,7 @@
/* FIXME: arch dependant, x86 version */
#define smp_wmb() asm volatile("" ::: "memory")
/* Compiler barrier */
#define barrier() asm volatile("" ::: "memory")
#endif