Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t

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To: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Date: Mon, 15 Oct 2018 16:35:29 -0700
Cc: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Clark Williams <williams@xxxxxxxxxx>, Alexander Potapenko <glider@xxxxxxxxxx>, kasan-dev <kasan-dev@xxxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-rt-users@xxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
In-reply-to: <20181013135058.GC4931@worktop.programming.kicks-ass.net>
References: <20181005163320.zkacovxvlih6blpp@linutronix.de> <CACT4Y+YoNCm=0C6PZtQR1V1j4QeQ0cFcJzpJF1hn34Oaht=jwg@mail.gmail.com> <20181009142742.ikh7xv2dn5skjjbe@linutronix.de> <CACT4Y+ZB38pKvT8+BAjDZ1t4ZjXQQKoya+ytXT+ASQxHUkWwnA@mail.gmail.com> <20181010092929.a5gd3fkkw6swco4c@linutronix.de> <CACT4Y+agGPSTZ-8A8r8haSeRM8UpRYMAF8BC4A87yeM9nvpP6w@mail.gmail.com> <20181010095343.6qxved3owi6yokoa@linutronix.de> <CACT4Y+ZpMjYBPS0GHP0AsEJZZmDjwV9DJBiVUzYKBnD+r9W4+A@mail.gmail.com> <20181010214945.5owshc3mlrh74z4b@linutronix.de> <20181012165655.f067886428a394dc7fbae7af@linux-foundation.org> <20181013135058.GC4931@worktop.programming.kicks-ass.net>

On Sat, 13 Oct 2018 15:50:58 +0200 Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> The whole raw_spinlock_t is for RT, no other reason.

Oh.  I never realised that.

Is this documented anywhere?  Do there exist guidelines which tell
non-rt developers and reviewers when it should be used?

Follow-Ups:
- Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t
  - From: Peter Zijlstra

References:
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Sebastian Andrzej Siewior
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Dmitry Vyukov
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Sebastian Andrzej Siewior
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Dmitry Vyukov
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Sebastian Andrzej Siewior
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Dmitry Vyukov
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Sebastian Andrzej Siewior
- Re: [PATCH] kasan: convert kasan/quarantine_lock to raw_spinlock
  - From: Dmitry Vyukov
- [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t
  - From: Sebastian Andrzej Siewior
- Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t
  - From: Andrew Morton
- Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t
  - From: Peter Zijlstra

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