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libxc: Update rmb/wmb for x86.
Only the compiler needs to see the barriers; not the CPU. Signed-off-by: Keir Fraser <keir@xen.org>
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Keir Fraser committed
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+6
-4
@@ -69,14 +69,16 @@
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* DEFINITIONS FOR CPU BARRIERS
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*/
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#define xen_barrier() asm volatile ( "" : : : "memory")
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#if defined(__i386__)
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#define xen_mb() asm volatile ( "lock; addl $0,0(%%esp)" : : : "memory" )
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#define xen_rmb() asm volatile ( "lock; addl $0,0(%%esp)" : : : "memory" )
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#define xen_wmb() asm volatile ( "" : : : "memory")
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#define xen_rmb() xen_barrier()
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#define xen_wmb() xen_barrier()
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#elif defined(__x86_64__)
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#define xen_mb() asm volatile ( "mfence" : : : "memory")
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#define xen_rmb() asm volatile ( "lfence" : : : "memory")
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#define xen_wmb() asm volatile ( "" : : : "memory")
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#define xen_rmb() xen_barrier()
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#define xen_wmb() xen_barrier()
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#elif defined(__ia64__)
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#define xen_mb() asm volatile ("mf" ::: "memory")
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#define xen_rmb() asm volatile ("mf" ::: "memory")
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