scripts/atomic/fallbacks/dec_if_positive at v5.2 · tjh.dev/kernel

tjh.dev / kernel

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

kernel / scripts / atomic / fallbacks / dec_if_positive

at v5.2 15 lines 235 B view raw

 1cat <<EOF
 2static inline ${ret}
 3${atomic}_dec_if_positive(${atomic}_t *v)
 4{
 5	${int} dec, c = ${atomic}_read(v);
 6
 7	do {
 8		dec = c - 1;
 9		if (unlikely(dec < 0))
10			break;
11	} while (!${atomic}_try_cmpxchg(v, &c, dec));
12
13	return dec;
14}
15EOF