linux-kernel - RE: [PATCH] list: Prevent compiler reloads inside 'safe' list iteration

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Message-ID: <77ff4da6b0a7448c947af6de4fb43cdb@AcuMS.aculab.com>
Date:   Tue, 10 Mar 2020 15:05:57 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Marco Elver' <elver@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>
CC:     Chris Wilson <chris@...is-wilson.co.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] list: Prevent compiler reloads inside 'safe' list
 iteration

From: Marco Elver
> Sent: 10 March 2020 14:10
...
> FWIW, for writes we're already being quite generous, in that plain
> aligned writes up to word-size are assumed to be "atomic" with the
> default (conservative) config, i.e. marking such writes is optional.
> Although, that's a generous assumption that is not always guaranteed
> to hold (https://lore.kernel.org/lkml/20190821103200.kpufwtviqhpbuv2n@willie-the-truck/).

Remind me to start writing everything in assembler.

That and to mark all structure members 'volatile'.

	David

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