x86 instructions lfence and sfence are rarely needed, thus we want
the cmm_smp_rmb/cmm_smp_wmb macros to be simple compiler barriers.
So, let the per-arch files override the default definitions in
arch/generic.h.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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