| Date | Fri, 21 Feb 2020 14:34:38 +0100 | From | Peter Zijlstra <> | Subject | [PATCH v4 22/27] compiler: Simple READ/WRITE_ONCE() implementations |
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Because I need WRITE_ONCE_NOCHECK() and in anticipation of Will's READ_ONCE rewrite, provide __{READ,WRITE}_ONCE_SCALAR().
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> --- include/linux/compiler.h | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -289,6 +289,14 @@ unsigned long read_word_at_a_time(const __u.__val; \ }) +#define __READ_ONCE_SCALAR(x) \ + (*(const volatile typeof(x) *)&(x)) + +#define __WRITE_ONCE_SCALAR(x, val) \ +do { \ + *(volatile typeof(x) *)&(x) = val; \ +} while (0) + #endif /* __KERNEL__ */ /*
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