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author | Ingo Molnar <mingo@kernel.org> | 2019-02-11 14:27:05 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2019-02-11 14:27:05 +0100 |
commit | 41b8687191cfd0326db03b0e82fb09d8c98ca641 (patch) | |
tree | a214babca0a181c67c25a615d608465a5f92f8c4 /scripts/atomic/fallbacks/dec_if_positive | |
parent | 49262de2270e09882d7bd8866a691cdd69ab32f6 (diff) | |
parent | bdf37b4dd35d2517cadc10735cd33022da7df133 (diff) |
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/dec_if_positive')
-rwxr-xr-x | scripts/atomic/fallbacks/dec_if_positive | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/scripts/atomic/fallbacks/dec_if_positive b/scripts/atomic/fallbacks/dec_if_positive new file mode 100755 index 000000000000..c52eacec43c8 --- /dev/null +++ b/scripts/atomic/fallbacks/dec_if_positive @@ -0,0 +1,15 @@ +cat <<EOF +static inline ${ret} +${atomic}_dec_if_positive(${atomic}_t *v) +{ + ${int} dec, c = ${atomic}_read(v); + + do { + dec = c - 1; + if (unlikely(dec < 0)) + break; + } while (!${atomic}_try_cmpxchg(v, &c, dec)); + + return dec; +} +EOF |