asm/rwonce: Remove smp_read_barrier_depends() invocation
Alpha overrides __READ_ONCE() directly, so there's no need to use smp_read_barrier_depends() in the core code. This also means that __READ_ONCE() can be relied upon to provide dependency ordering. Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Will Deacon <will@kernel.org>
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@ -40,24 +40,16 @@
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/*
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* Use __READ_ONCE() instead of READ_ONCE() if you do not require any
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* atomicity or dependency ordering guarantees. Note that this may result
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* in tears!
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* atomicity. Note that this may result in tears!
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*/
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#ifndef __READ_ONCE
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#define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
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#endif
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#define __READ_ONCE_SCALAR(x) \
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({ \
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__unqual_scalar_typeof(x) __x = __READ_ONCE(x); \
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smp_read_barrier_depends(); \
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(typeof(x))__x; \
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})
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#define READ_ONCE(x) \
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({ \
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compiletime_assert_rwonce_type(x); \
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__READ_ONCE_SCALAR(x); \
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__READ_ONCE(x); \
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})
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#define __WRITE_ONCE(x, val) \
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@ -84,12 +76,9 @@ unsigned long __read_once_word_nocheck(const void *addr)
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*/
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#define READ_ONCE_NOCHECK(x) \
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({ \
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unsigned long __x; \
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compiletime_assert(sizeof(x) == sizeof(__x), \
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compiletime_assert(sizeof(x) == sizeof(unsigned long), \
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"Unsupported access size for READ_ONCE_NOCHECK()."); \
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__x = __read_once_word_nocheck(&(x)); \
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smp_read_barrier_depends(); \
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(typeof(x))__x; \
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(typeof(x))__read_once_word_nocheck(&(x)); \
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})
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static __no_kasan_or_inline
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