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Subject[PATCH] selftest/vm: clarify error statement in gup_test
Date
Print two possible reasons /sys/kernel/debug/gup_test
cannot be opened to help users of this test diagnose
failures.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: stable@vger.kernel.org # 5.15+
---
tools/testing/selftests/vm/gup_test.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/vm/gup_test.c b/tools/testing/selftests/vm/gup_test.c
index fe043f67798b0..c496bcefa7a0e 100644
--- a/tools/testing/selftests/vm/gup_test.c
+++ b/tools/testing/selftests/vm/gup_test.c
@@ -205,7 +205,9 @@ int main(int argc, char **argv)

gup_fd = open("/sys/kernel/debug/gup_test", O_RDWR);
if (gup_fd == -1) {
- perror("open");
+ perror("failed to open /sys/kernel/debug/gup_test");
+ printf("check if CONFIG_GUP_TEST is enabled in kernel config\n");
+ printf("check if debugfs is mounted at /sys/kernel/debug\n");
exit(1);
}

--
2.24.1
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