linux-kernel - [PATCH 5.5 27/56] driver core: Fix test_async_driver

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Message-Id: <20200130183614.066118554@linuxfoundation.org>
Date:   Thu, 30 Jan 2020 19:38:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 5.5 27/56] driver core: Fix test_async_driver_probe if NUMA is disabled

From: Guenter Roeck <linux@...ck-us.net>

commit 264d25275a46fce5da501874fa48a2ae5ec571c8 upstream.

Since commit 57ea974fb871 ("driver core: Rewrite test_async_driver_probe
to cover serialization and NUMA affinity"), running the test with NUMA
disabled results in warning messages similar to the following.

test_async_driver test_async_driver.12: NUMA node mismatch -1 != 0

If CONFIG_NUMA=n, dev_to_node(dev) returns -1, and numa_node_id()
returns 0. Both are widely used, so it appears risky to change return
values. Augment the check with IS_ENABLED(CONFIG_NUMA) instead
to fix the problem.

Cc: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Fixes: 57ea974fb871 ("driver core: Rewrite test_async_driver_probe to cover serialization and NUMA affinity")
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Cc: stable <stable@...r.kernel.org>
Acked-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Link: https://lore.kernel.org/r/20191127202453.28087-1-linux@roeck-us.net
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/base/test/test_async_driver_probe.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/base/test/test_async_driver_probe.c
+++ b/drivers/base/test/test_async_driver_probe.c
@@ -44,7 +44,8 @@ static int test_probe(struct platform_de
 	 * performing an async init on that node.
 	 */
 	if (dev->driver->probe_type == PROBE_PREFER_ASYNCHRONOUS) {
-		if (dev_to_node(dev) != numa_node_id()) {
+		if (IS_ENABLED(CONFIG_NUMA) &&
+		    dev_to_node(dev) != numa_node_id()) {
 			dev_warn(dev, "NUMA node mismatch %d != %d\n",
 				 dev_to_node(dev), numa_node_id());
 			atomic_inc(&warnings);