linux-kernel - Re: [PATCH v3 5/5] lib/test_sysctl: support testing of sysctl. boot parameter

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Date:   Wed, 13 May 2020 13:15:32 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-mm@...ck.org, Ivan Teterevkov <ivan.teterevkov@...anix.com>,
        Michal Hocko <mhocko@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Guilherme G . Piccoli" <gpiccoli@...onical.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v3 5/5] lib/test_sysctl: support testing of sysctl. boot
 parameter

On Wed, May 13, 2020 at 10:58:16AM +0200, Vlastimil Babka wrote:
> On 5/11/20 8:31 PM, Luis Chamberlain wrote:
> > On Mon, May 11, 2020 at 01:05:22PM +0200, Vlastimil Babka wrote:
> >> ----8<----
> >> From a999e993a89e521b152bbd4b1466f69e62879c30 Mon Sep 17 00:00:00 2001
> >> From: Vlastimil Babka <vbabka@...e.cz>
> >> Date: Mon, 11 May 2020 12:59:49 +0200
> >> Subject: [PATCH] lib/test_sysctl: support testing of sysctl. boot parameter -
> >>  fix
> >> 
> >> Skip the new test if boot_int sysctl is not present, otherwise, per Luis,
> >> "This would fail if someone uses this script to test an older kernel, and
> >> the scripts in selftests are supposed to work with older kernels."
> >> 
> >> Suggested-by: Luis Chamberlain <mcgrof@...nel.org>
> >> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
> >> ---
> >>  tools/testing/selftests/sysctl/sysctl.sh | 5 +++++
> >>  1 file changed, 5 insertions(+)
> >> 
> >> diff --git a/tools/testing/selftests/sysctl/sysctl.sh b/tools/testing/selftests/sysctl/sysctl.sh
> >> index ef6417b8067b..148704f465b5 100755
> >> --- a/tools/testing/selftests/sysctl/sysctl.sh
> >> +++ b/tools/testing/selftests/sysctl/sysctl.sh
> >> @@ -756,6 +756,11 @@ sysctl_test_0006()
> > 
> > You want to:
> > 
> >                                                                                 
> > # Kselftest framework requirement - SKIP code is 4.                             
> > ksft_skip=4 
> > 
> >>  sysctl_test_0007()
> >>  {
> >>  	TARGET="${SYSCTL}/boot_int"
> >> +	if [ ! -f $TARGET ]; then
> >> +		echo "Skipping test for $TARGET as it is not present ..."
> >> +		return 0
> >> +	fi
> > 
> > And return 4 instead.
> 
> If I return it from the function, nobody will care, AFAICS. If I 'exit
> $ksft_skip', is that correct if it's just a single test out of 7?

yes please do that.

  Luis