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Date:   Mon, 15 Oct 2018 16:35:29 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Dmitry Vyukov <dvyukov@google.com>,
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        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] mm/kasan: make quarantine_lock a raw_spinlock_t
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On Sat, 13 Oct 2018 15:50:58 +0200 Peter Zijlstra <peterz@infradead.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?