linux-kernel - [PATCH] selftests: cgroup: fix test_zswap error path and meaningless check

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Date:   Tue, 12 Sep 2023 10:38:00 +0200
From:   Domenico Cerasuolo <cerasuolodomenico@...il.com>
To:     dan.carpenter@...aro.org, akpm@...ux-foundation.org,
        kernel-team@...a.com, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc:     Domenico Cerasuolo <cerasuolodomenico@...il.com>
Subject: [PATCH] selftests: cgroup: fix test_zswap error path and meaningless check

Replace destruction paths with simple returns before the test cgroup is
created, there is nothing to free or destroy at that point.

Remove pointless check, stored_pages is a size_t and cannot be < 0.

Fixes: a549f9f31561 ("selftests: cgroup: add test_zswap with no kmem bypass test")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Domenico Cerasuolo <cerasuolodomenico@...il.com>
---
 tools/testing/selftests/cgroup/test_zswap.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/cgroup/test_zswap.c b/tools/testing/selftests/cgroup/test_zswap.c
index 49def87a909b..5257106776d5 100644
--- a/tools/testing/selftests/cgroup/test_zswap.c
+++ b/tools/testing/selftests/cgroup/test_zswap.c
@@ -178,10 +178,10 @@ static int test_no_kmem_bypass(const char *root)
 
 	/* Set up test memcg */
 	if (cg_write(root, "cgroup.subtree_control", "+memory"))
-		goto out;
+		return KSFT_FAIL;
 	test_group = cg_name(root, "kmem_bypass_test");
 	if (!test_group)
-		goto out;
+		return KSFT_FAIL;
 
 	/* Spawn memcg child and wait for it to allocate */
 	set_min_free_kb(min_free_kb_low);
@@ -208,8 +208,6 @@ static int test_no_kmem_bypass(const char *root)
 		free(trigger_allocation);
 		if (get_zswap_stored_pages(&stored_pages))
 			break;
-		if (stored_pages < 0)
-			break;
 		/* If memory was pushed to zswap, verify it belongs to memcg */
 		if (stored_pages > stored_pages_threshold) {
 			int zswapped = cg_read_key_long(test_group, "memory.stat", "zswapped ");
-- 
2.34.1