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| author |   Ingo Molnar <mingo@kernel.org> | 2019-02-11 14:27:05 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-02-11 14:27:05 +0100 |
| commit | 41b8687191cfd0326db03b0e82fb09d8c98ca641 (patch) | |
| tree | a214babca0a181c67c25a615d608465a5f92f8c4 /scripts/atomic/fallbacks/try_cmpxchg | |
| parent | futex: Convert futex_pi_state.refcount to refcount_t (diff) | |
| parent | locking/atomics: Fix out-of-tree build (diff) | |
| download | linux-dev-41b8687191cfd0326db03b0e82fb09d8c98ca641.tar.xz linux-dev-41b8687191cfd0326db03b0e82fb09d8c98ca641.zip | |
Merge branch 'locking/atomics' into locking/core, to pick up WIP commits
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'scripts/atomic/fallbacks/try_cmpxchg')
| -rwxr-xr-x | scripts/atomic/fallbacks/try_cmpxchg | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/scripts/atomic/fallbacks/try_cmpxchg b/scripts/atomic/fallbacks/try_cmpxchg new file mode 100755 index 000000000000..4ed85e2f5378 --- /dev/null +++ b/scripts/atomic/fallbacks/try_cmpxchg @@ -0,0 +1,11 @@ +cat <<EOF +static inline bool +${atomic}_try_cmpxchg${order}(${atomic}_t *v, ${int} *old, ${int} new) +{ + ${int} r, o = *old; + r = ${atomic}_cmpxchg${order}(v, o, new); + if (unlikely(r != o)) + *old = r; + return likely(r == o); +} +EOF |