linux-kselftest.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: <Tim.Bird@sony.com>
To: <alexei.starovoitov@gmail.com>
Cc: <yang.lee@linux.alibaba.com>, <shuah@kernel.org>,
	<ast@kernel.org>, <daniel@iogearbox.net>, <andrii@kernel.org>,
	<kafai@fb.com>, <songliubraving@fb.com>, <yhs@fb.com>,
	<john.fastabend@gmail.com>, <kpsingh@kernel.org>,
	<linux-kselftest@vger.kernel.org>, <netdev@vger.kernel.org>,
	<bpf@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] selftests/bpf: use !E instead of comparing with NULL
Date: Tue, 13 Apr 2021 16:19:21 +0000	[thread overview]
Message-ID: <BN7PR13MB2499152182E86AD94A3B0E22FD4F9@BN7PR13MB2499.namprd13.prod.outlook.com> (raw)
In-Reply-To: <CAADnVQJJ03L5H11P0NYNC9kYy=YkQdWrbpytB2Jps8AuxgamFA@mail.gmail.com>

> -----Original Message-----
> From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
> 
> On Tue, Apr 13, 2021 at 9:10 AM <Tim.Bird@sony.com> wrote:
> >
> >
> >
> > > -----Original Message-----
> > > From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
> > >
> > > On Tue, Apr 13, 2021 at 2:52 AM Yang Li <yang.lee@linux.alibaba.com> wrote:
> > > >
> > > > Fix the following coccicheck warnings:
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:189:7-11: WARNING
> > > > comparing pointer to 0, suggest !E
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:361:7-11: WARNING
> > > > comparing pointer to 0, suggest !E
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:386:14-18: WARNING
> > > > comparing pointer to 0, suggest !E
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:402:14-18: WARNING
> > > > comparing pointer to 0, suggest !E
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:433:7-11: WARNING
> > > > comparing pointer to 0, suggest !E
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:534:14-18: WARNING
> > > > comparing pointer to 0, suggest !E
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:625:7-11: WARNING
> > > > comparing pointer to 0, suggest !E
> > > > ./tools/testing/selftests/bpf/progs/profiler.inc.h:767:7-11: WARNING
> > > > comparing pointer to 0, suggest !E
> > > >
> > > > Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> > > > Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
> > > > ---
> > > >  tools/testing/selftests/bpf/progs/profiler.inc.h | 22 +++++++++++-----------
> > > >  1 file changed, 11 insertions(+), 11 deletions(-)
> > > >
> > > > diff --git a/tools/testing/selftests/bpf/progs/profiler.inc.h b/tools/testing/selftests/bpf/progs/profiler.inc.h
> > > > index 4896fdf8..a33066c 100644
> > > > --- a/tools/testing/selftests/bpf/progs/profiler.inc.h
> > > > +++ b/tools/testing/selftests/bpf/progs/profiler.inc.h
> > > > @@ -189,7 +189,7 @@ static INLINE void populate_ancestors(struct task_struct* task,
> > > >  #endif
> > > >         for (num_ancestors = 0; num_ancestors < MAX_ANCESTORS; num_ancestors++) {
> > > >                 parent = BPF_CORE_READ(parent, real_parent);
> > > > -               if (parent == NULL)
> > > > +               if (!parent)
> > >
> > > Sorry, but I'd like the progs to stay as close as possible to the way
> > > they were written.
> > Why?
> >
> > > They might not adhere to kernel coding style in some cases.
> > > The code could be grossly inefficient and even buggy.
> > There would have to be a really good reason to accept
> > grossly inefficient and even buggy code into the kernel.
> >
> > Can you please explain what that reason is?
> 
> It's not the kernel. It's a test of bpf program.
That doesn't answer the question of why you don't want any changes.

Why would we not use kernel coding style guidelines and quality thresholds for
testing code?  This *is* going into the kernel source tree, where it will be
maintained and used by other developers.
 -- Tim



  reply	other threads:[~2021-04-13 16:19 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-13  9:52 [PATCH] selftests/bpf: use !E instead of comparing with NULL Yang Li
2021-04-13 15:17 ` Alexei Starovoitov
2021-04-13 16:10   ` Tim.Bird
2021-04-13 16:13     ` Alexei Starovoitov
2021-04-13 16:19       ` Tim.Bird [this message]
2021-04-13 16:26         ` Alexei Starovoitov
2021-04-13 16:32           ` Tim.Bird
2021-04-13 16:56             ` Alexei Starovoitov
2021-04-13 17:22               ` Tim.Bird

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=BN7PR13MB2499152182E86AD94A3B0E22FD4F9@BN7PR13MB2499.namprd13.prod.outlook.com \
    --to=tim.bird@sony.com \
    --cc=alexei.starovoitov@gmail.com \
    --cc=andrii@kernel.org \
    --cc=ast@kernel.org \
    --cc=bpf@vger.kernel.org \
    --cc=daniel@iogearbox.net \
    --cc=john.fastabend@gmail.com \
    --cc=kafai@fb.com \
    --cc=kpsingh@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-kselftest@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=shuah@kernel.org \
    --cc=songliubraving@fb.com \
    --cc=yang.lee@linux.alibaba.com \
    --cc=yhs@fb.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).