The patch titled Subject: tools/testing/selftests/sysctl/sysctl.sh: ignore diff output on verify_diff_w() has been added to the -mm tree. Its filename is test_sysctl-ignore-diff-output-on-verify_diff_w.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/test_sysctl-ignore-diff-output-on-verify_diff_w.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/test_sysctl-ignore-diff-output-on-verify_diff_w.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Luis Chamberlain <mcgrof@xxxxxxxxxx> Subject: tools/testing/selftests/sysctl/sysctl.sh: ignore diff output on verify_diff_w() When verify_diff_w() is used we care about the result, not the verbose output, and although we use -q, that still gives us a chatty message about if the files differ or not. Since verify_diff_w() uses stdinput the chatty message says whether or not "-" matches the target file, and this just seems rather odd. Better to just ignore that messsage all together, what we really care about i sthe results, the return value and we check for that. Link: http://lkml.kernel.org/r/20190320222831.8243-4-mcgrof@xxxxxxxxxx Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx> Acked-by: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Eric Sandeen <sandeen@xxxxxxxxxx> Cc: Eric Sandeen <sandeen@xxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- tools/testing/selftests/sysctl/sysctl.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/tools/testing/selftests/sysctl/sysctl.sh~test_sysctl-ignore-diff-output-on-verify_diff_w +++ a/tools/testing/selftests/sysctl/sysctl.sh @@ -179,7 +179,7 @@ verify() verify_diff_w() { - echo "$TEST_STR" | diff -q -w -u - $1 + echo "$TEST_STR" | diff -q -w -u - $1 > /dev/null return $? } _ Patches currently in -mm which might be from mcgrof@xxxxxxxxxx are test_sysctl-remove-superfluous-test_reqs.patch test_sysctl-load-module-before-testing-for-it.patch test_sysctl-ignore-diff-output-on-verify_diff_w.patch test_sysctl-allow-graceful-use-on-older-kernels.patch