asm-generic: guard smp_store_release/load_acquire
Allow architectures to override smp_store_release and smp_load_acquire by guarding the defines in asm-generic/barrier.h with ifndef directives. This is in preparation to reusing asm-generic/barrier.h on architectures which have their own definition of these macros. Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
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