diff options
Diffstat (limited to 'scripts/atomic/fallbacks/dec_if_positive')
| -rwxr-xr-x | scripts/atomic/fallbacks/dec_if_positive | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/scripts/atomic/fallbacks/dec_if_positive b/scripts/atomic/fallbacks/dec_if_positive index 86bdced3428d..3459075d8674 100755 --- a/scripts/atomic/fallbacks/dec_if_positive +++ b/scripts/atomic/fallbacks/dec_if_positive @@ -1,3 +1,19 @@ +if /bin/sh ${ATOMICDIR}/chkdup.sh arch_${atomic}_dec_if_positive dec_if_positive +then +cat <<EOF +/** + * arch_${atomic}_dec_if_positive - Atomic decrement if old value is positive + * @v: pointer of type ${atomic}_t + * + * Atomically decrement @v with full ordering, but only if the original + * value is greater than zero, returning new value. Note that the desired + * new value will be returned even if the decrement did not occur, so that + * if the old value is -3, then there @v will not be decremented, but -4 + * will be returned. As a result, if the return value is non-negative, + * then the value was in fact decremented. + */ +EOF +fi cat <<EOF static __always_inline ${ret} arch_${atomic}_dec_if_positive(${atomic}_t *v) |