From: Andrew Morton <akpm@linux-foundation.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Dmitry Vyukov <dvyukov@google.com>,
Clark Williams <williams@redhat.com>,
Alexander Potapenko <glider@google.com>,
kasan-dev <kasan-dev@googlegroups.com>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-users@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t
Date: Fri, 12 Oct 2018 16:56:55 -0700 [thread overview]
Message-ID: <20181012165655.f067886428a394dc7fbae7af@linux-foundation.org> (raw)
In-Reply-To: <20181010214945.5owshc3mlrh74z4b@linutronix.de>
On Wed, 10 Oct 2018 23:49:45 +0200 Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> On 2018-10-10 11:57:41 [+0200], Dmitry Vyukov wrote:
> > Yes. Clark's patch looks good to me. Probably would be useful to add a
> > comment as to why raw spinlock is used (otherwise somebody may
> > refactor it back later).
>
> If you really insist, I could add something but this didn't happen so
> far. git's changelog should provide enough information why to why it was
> changed.
Requiring code readers to look up changelogs in git is rather user-hostile.
There are several reasons for using raw_*, so an explanatory comment at
each site is called for.
However it would be smarter to stop "using raw_* for several reasons".
Instead, create a differently named variant for each such reason. ie, do
/*
* Nice comment goes here. It explains all the possible reasons why -rt
* might use a raw_spin_lock when a spin_lock could otherwise be used.
*/
#define raw_spin_lock_for_rt raw_spinlock
Then use raw_spin_lock_for_rt() at all such sites.
next prev parent reply other threads:[~2018-10-12 23:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-18 15:29 [PATCH RT] rt: convert mm/kasan/quarantine_lock to raw_spinlock Clark Williams
2018-09-18 20:34 ` kbuild test robot
2018-10-05 16:37 ` Sebastian Andrzej Siewior
2018-10-18 9:04 ` [kbuild-all] " Rong Chen
2018-10-05 16:30 ` [PATCH] kasan: convert kasan/quarantine_lock " Sebastian Andrzej Siewior
2018-10-05 16:33 ` Sebastian Andrzej Siewior
2018-10-08 0:47 ` Clark Williams
2018-10-08 9:15 ` Dmitry Vyukov
2018-10-09 14:27 ` Sebastian Andrzej Siewior
2018-10-10 8:25 ` Dmitry Vyukov
2018-10-10 9:29 ` Sebastian Andrzej Siewior
2018-10-10 9:45 ` Dmitry Vyukov
2018-10-10 9:53 ` Sebastian Andrzej Siewior
2018-10-10 9:57 ` Dmitry Vyukov
2018-10-10 21:49 ` [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t Sebastian Andrzej Siewior
2018-10-11 8:03 ` Dmitry Vyukov
2018-10-12 23:56 ` Andrew Morton [this message]
2018-10-13 13:50 ` Peter Zijlstra
2018-10-15 23:35 ` Andrew Morton
2018-10-19 10:58 ` Peter Zijlstra
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