Commit b78b331a authored by Will Deacon's avatar Will Deacon

asm/rwonce: Allow __READ_ONCE to be overridden by the architecture

The meat and potatoes of READ_ONCE() is defined by the __READ_ONCE()
macro, which uses a volatile casts in an attempt to avoid tearing of
byte, halfword, word and double-word accesses. Allow this to be
overridden by the architecture code in the case that things like memory
barriers are also required.
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent e506ea45
......@@ -43,7 +43,9 @@
* atomicity or dependency ordering guarantees. Note that this may result
* in tears!
*/
#ifndef __READ_ONCE
#define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
#endif
#define __READ_ONCE_SCALAR(x) \
({ \
......
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