File: dec_if_positive

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cat <<EOF
static __always_inline ${ret}
${arch}${atomic}_dec_if_positive(${atomic}_t *v)
{
	${int} dec, c = ${arch}${atomic}_read(v);

	do {
		dec = c - 1;
		if (unlikely(dec < 0))
			break;
	} while (!${arch}${atomic}_try_cmpxchg(v, &c, dec));

	return dec;
}
EOF