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[2/4] selftests/cgroup: fix clang warnings: uninitialized fd variable

Message ID 20240503035105.93280-3-jhubbard@nvidia.com (mailing list archive)
State Accepted
Commit 0515089418d064000b7f375257c10107d3ad0c7f
Headers show
Series selftests/cgroups: fix clang build failures, warnings | expand

Commit Message

John Hubbard May 3, 2024, 3:51 a.m. UTC 
First of all, in order to build with clang at all, one must first apply
Valentin Obst's build fix for LLVM [1]. Once that is done, then when
building with clang, via:

    make LLVM=1 -C tools/testing/selftests

...clang warns about fd being used uninitialized, in
test_memcg_reclaim()'s error handling path.

Fix this by initializing fd to -1.

[1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@valentinobst.de/

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---
 tools/testing/selftests/cgroup/test_memcontrol.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Comments

Roman Gushchin May 3, 2024, 5:54 p.m. UTC | #1 
On Thu, May 02, 2024 at 08:51:03PM -0700, John Hubbard wrote:
> First of all, in order to build with clang at all, one must first apply
> Valentin Obst's build fix for LLVM [1]. Once that is done, then when
> building with clang, via:
> 
>     make LLVM=1 -C tools/testing/selftests
> 
> ...clang warns about fd being used uninitialized, in
> test_memcg_reclaim()'s error handling path.
> 
> Fix this by initializing fd to -1.
> 
> [1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@valentinobst.de/
> 
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>

Reviewed-by: Roman Gushchin <roman.gushchin@linux.dev>
diff mbox series

Patch

diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
index c7c9572003a8..a97832b0c1cd 100644
--- a/tools/testing/selftests/cgroup/test_memcontrol.c
+++ b/tools/testing/selftests/cgroup/test_memcontrol.c
@@ -716,7 +716,9 @@  static bool reclaim_until(const char *memcg, long goal)
  */
 static int test_memcg_reclaim(const char *root)
 {
-	int ret = KSFT_FAIL, fd, retries;
+	int ret = KSFT_FAIL;
+	int fd = -1;
+	int retries;
 	char *memcg;
 	long current, expected_usage;