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From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Wed, 5 Jan 2022 14:51:05 -0800
Message-ID: <CAHk-=wggCHypiukgs2_tm-00r2xaAkG8MQjuZtSNoG_umg7Rrg@mail.gmail.com>
Subject: Re: [PATCH 02/10] exit: Add and use make_task_dead.
To:     Al Viro <viro@zeniv.linux.org.uk>
Cc:     "Eric W. Biederman" <ebiederm@xmission.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Alexey Gladkov <legion@kernel.org>,
        Kyle Huey <me@kylehuey.com>, Oleg Nesterov <oleg@redhat.com>,
        Kees Cook <keescook@chromium.org>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Chris Zankel <chris@zankel.net>,
        Max Filippov <jcmvbkbc@gmail.com>
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On Wed, Jan 5, 2022 at 1:53 PM Al Viro <viro@zeniv.linux.org.uk> wrote:
>
> On Wed, Jan 05, 2022 at 02:46:10PM -0600, Eric W. Biederman wrote:
> >
> > Being in assembly it did not have anything after the name do_exit so it
> > hid from my regex "[^A-Za-z0-9_]do_exit[^A-Za-z0-9]".  Thank you for
> > finding that.
>
> Umm...  What's wrong with '\<do_exit\>'?

Christ people, you both make it so complicated.

If you want to search for 'do_exit', just do

        git grep -w do_exit

where that '-w' does exactly that "word boundary" thing.

I thought everybody knew about this, because it's such a common thing
to do - checking my shell history, more than a third of my "git grep"
uses use '-w', exactly because it's very convenient for identifier
lookup

But yes, in more complex cases where you have other parts to the
pattern (ie you're not looking *just* for a single word), by all means
use '\<' and/or '\>'.

                 Linus