File: dec_unless_positive

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cat <<EOF
static __always_inline bool
${arch}${atomic}_dec_unless_positive(${atomic}_t *v)
{
	${int} c = ${arch}${atomic}_read(v);

	do {
		if (unlikely(c > 0))
			return false;
	} while (!${arch}${atomic}_try_cmpxchg(v, &c, c - 1));

	return true;
}
EOF