static inline int arch_futex_atomic_op_inuser()

in include/asm/futex.h [29:70]

• 35 lines of code
• 11 McCabe index (conditional complexity)

static inline int arch_futex_atomic_op_inuser(int op, u32 oparg, int *oval,
		u32 __user *uaddr)
{
	u32 oldval, newval, prev;
	int ret;

	do {
		ret = get_user(oldval, uaddr);

		if (ret) break;

		switch (op) {
		case FUTEX_OP_SET:
			newval = oparg;
			break;
		case FUTEX_OP_ADD:
			newval = oldval + oparg;
			break;
		case FUTEX_OP_OR:
			newval = oldval | oparg;
			break;
		case FUTEX_OP_ANDN:
			newval = oldval & ~oparg;
			break;
		case FUTEX_OP_XOR:
			newval = oldval ^ oparg;
			break;
		default:
			ret = -ENOSYS;
			break;
		}

		if (ret) break;

		ret = futex_atomic_cmpxchg_inatomic(&prev, uaddr, oldval, newval);
	} while (!ret && prev != oldval);

	if (!ret)
		*oval = oldval;

	return ret;
}