diff options
| author | Sumit Semwal <sumit.semwal@linaro.org> | 2016-05-17 15:10:09 +0000 |
|---|---|---|
| committer | Sumit Semwal <sumit.semwal@linaro.org> | 2016-05-17 15:10:09 +0000 |
| commit | 99e17f8a0421fd1958bdee92e7e66c22b89d9556 (patch) | |
| tree | 15cacceadb018151ac80cd34c786cef5818d614d /include/asm-generic/bitops/lock.h | |
| parent | 914edc40eafa0dabf561bf29c8e768a4b636e7f5 (diff) | |
| parent | 08e85b5fa9b0d262c8d69709088ec7fbbab2ad28 (diff) | |
Merge branch 'android-hikey-linaro-4.4' of https://android.googlesource.com/kernel/hikey-linaro into clang-4.4android-hikey-linaro-4.4-clang
Diffstat (limited to 'include/asm-generic/bitops/lock.h')
| -rw-r--r-- | include/asm-generic/bitops/lock.h | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/include/asm-generic/bitops/lock.h b/include/asm-generic/bitops/lock.h index c30266e94806..8ef0ccbf8167 100644 --- a/include/asm-generic/bitops/lock.h +++ b/include/asm-generic/bitops/lock.h @@ -29,16 +29,16 @@ do { \ * @nr: the bit to set * @addr: the address to start counting from * - * This operation is like clear_bit_unlock, however it is not atomic. - * It does provide release barrier semantics so it can be used to unlock - * a bit lock, however it would only be used if no other CPU can modify - * any bits in the memory until the lock is released (a good example is - * if the bit lock itself protects access to the other bits in the word). + * A weaker form of clear_bit_unlock() as used by __bit_lock_unlock(). If all + * the bits in the word are protected by this lock some archs can use weaker + * ops to safely unlock. + * + * See for example x86's implementation. */ #define __clear_bit_unlock(nr, addr) \ do { \ - smp_mb(); \ - __clear_bit(nr, addr); \ + smp_mb__before_atomic(); \ + clear_bit(nr, addr); \ } while (0) #endif /* _ASM_GENERIC_BITOPS_LOCK_H_ */ |