On Wed, 30 Mar 2022 21:52:57 +0000 Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx> wrote:
> 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@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # 5.15+
>
> ...
>
> --- 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);
> }
Thanks. I don't think this is -stable material...
