Micro-optimize zrl_remove()

atomic_dec_32() should be a bit lighter than atomic_dec_32_nv().

Reviewed-by: Tino Reichardt <[email protected]>
Reviewed-by: Richard Yao <[email protected]>
Signed-off-by: Ryan Moeller <[email protected]>
Signed-off-by: Alexander Motin <[email protected]>
Closes #14200

Author: amotin

module/zfs/zrlock.c

@@ -106,16 +106,16 @@ zrl_add_impl(zrlock_t *zrl, const char *zc)
 void
 zrl_remove(zrlock_t *zrl)
 {
-	uint32_t n;
-
 #ifdef	ZFS_DEBUG
 	if (zrl->zr_owner == curthread) {
 		zrl->zr_owner = NULL;
 		zrl->zr_caller = NULL;
 	}
+	int32_t n = atomic_dec_32_nv((uint32_t *)&zrl->zr_refcount);
+	ASSERT3S(n, >=, 0);
+#else
+	atomic_dec_32((uint32_t *)&zrl->zr_refcount);
 #endif
-	n = atomic_dec_32_nv((uint32_t *)&zrl->zr_refcount);
-	ASSERT3S((int32_t)n, >=, 0);
 }
 
 int