linux-kernel - Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock

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Date:   Mon, 15 Oct 2018 16:35:29 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Clark Williams <williams@...hat.com>,
        Alexander Potapenko <glider@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t

On Sat, 13 Oct 2018 15:50:58 +0200 Peter Zijlstra <peterz@...radead.org> 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?