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| author | Wolfram Sang <wsa@the-dreams.de> | 2018-05-09 17:40:44 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2018-05-09 17:40:44 +0200 |
| commit | 4c0330208f6bfe5285bae239fdb2a7ec1ce1f78d (patch) | |
| tree | 257c871b0be4c7eafa0e6911ab596bfb0f51a104 /include/linux/wait_bit.h | |
| parent | 7781edaed63e9396fc913e0899cb197562e6f1a0 (diff) | |
| parent | 76aa3de7095f15af7300012cb29ea8ab93eec348 (diff) | |
Merge tag 'at24-4.17-rc5-fixes-for-wolfram' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into i2c/for-current
Single bug-fix for a regression introduced during the 4.17 merge window.
Diffstat (limited to 'include/linux/wait_bit.h')
| -rw-r--r-- | include/linux/wait_bit.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/wait_bit.h b/include/linux/wait_bit.h index 9318b2166439..2b0072fa5e92 100644 --- a/include/linux/wait_bit.h +++ b/include/linux/wait_bit.h @@ -305,4 +305,21 @@ do { \ __ret; \ }) +/** + * clear_and_wake_up_bit - clear a bit and wake up anyone waiting on that bit + * + * @bit: the bit of the word being waited on + * @word: the word being waited on, a kernel virtual address + * + * You can use this helper if bitflags are manipulated atomically rather than + * non-atomically under a lock. + */ +static inline void clear_and_wake_up_bit(int bit, void *word) +{ + clear_bit_unlock(bit, word); + /* See wake_up_bit() for which memory barrier you need to use. */ + smp_mb__after_atomic(); + wake_up_bit(word, bit); +} + #endif /* _LINUX_WAIT_BIT_H */ |