diff options
| author |   Ingo Molnar <mingo@kernel.org> | 2018-05-14 09:02:14 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-05-14 09:02:14 +0200 |
| commit | dfd5c3ea641b1697333e5f6704e4e5dddfafe86b (patch) | |
| tree | 5eab12757acaec0f7ff07a48f4b66140b78eb969 /include/linux/wait_bit.h | |
| parent | sched/core: Don't schedule threads on pre-empted vCPUs (diff) | |
| parent | Linux 4.17-rc5 (diff) | |
Merge tag 'v4.17-rc5' into sched/core, to pick up fixes and dependencies
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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 */ |