* [PATCH] selftests/vm: fix errno handling in mrelease_test
@ 2022-07-04 17:26 Adam Sindelar
0 siblings, 0 replies; only message in thread
From: Adam Sindelar @ 2022-07-04 17:26 UTC (permalink / raw)
To: Andrew Morton
Cc: linux-mm, Adam Sindelar, Adam Sindelar, David Vernet, kernel-team
mrelease_test should return KSFT_SKIP when process_mrelease is not
defined, but due to a perror call consuming the errno, it returns
KSFT_FAIL.
This patch decides the exit code before calling perror.
Signed-off-by: Adam Sindelar <adam@wowsignal.io>
---
tools/testing/selftests/vm/mrelease_test.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/vm/mrelease_test.c b/tools/testing/selftests/vm/mrelease_test.c
index 96671c2f7d48..bdf49a0af3f6 100644
--- a/tools/testing/selftests/vm/mrelease_test.c
+++ b/tools/testing/selftests/vm/mrelease_test.c
@@ -100,8 +100,10 @@ int main(void)
/* Test a wrong pidfd */
if (!syscall(__NR_process_mrelease, -1, 0) || errno != EBADF) {
+ /* perror overwrites errno, so this line must be first */
+ res = errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL;
perror("process_mrelease with wrong pidfd");
- exit(errno == ENOSYS ? KSFT_SKIP : KSFT_FAIL);
+ exit(res);
}
/* Start the test with 1MB child memory allocation */
--
2.35.1
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