diff options
| author | David S. Miller <davem@davemloft.net> | 2018-02-19 18:46:11 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-02-19 18:46:11 -0500 |
| commit | f5c0c6f4299f870f074235fbf552ecf957fc249c (patch) | |
| tree | 6b46b9c0b271185b6f98fab350c3891042e729b1 /Documentation/atomic_bitops.txt | |
| parent | 26736a08ee0fb89a4f09bfb2c9f0805028ff63aa (diff) | |
| parent | 79c0ef3e85c015b0921a8fd5dd539d1480e9cd6c (diff) | |
| download | linux-f5c0c6f4299f870f074235fbf552ecf957fc249c.tar.bz2 | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'Documentation/atomic_bitops.txt')
| -rw-r--r-- | Documentation/atomic_bitops.txt | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/atomic_bitops.txt b/Documentation/atomic_bitops.txt index 5550bfdcce5f..be70b32c95d9 100644 --- a/Documentation/atomic_bitops.txt +++ b/Documentation/atomic_bitops.txt @@ -58,7 +58,12 @@ Like with atomic_t, the rule of thumb is: - RMW operations that have a return value are fully ordered. -Except for test_and_set_bit_lock() which has ACQUIRE semantics and + - RMW operations that are conditional are unordered on FAILURE, + otherwise the above rules apply. In the case of test_and_{}_bit() operations, + if the bit in memory is unchanged by the operation then it is deemed to have + failed. + +Except for a successful test_and_set_bit_lock() which has ACQUIRE semantics and clear_bit_unlock() which has RELEASE semantics. Since a platform only has a single means of achieving atomic operations |