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Date: Sun, 18 Nov 2001 18:04:16 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: Horst von Brand <vonbrand@sleipnir.valparaiso.cl>
cc: Andrea Arcangeli <andrea@suse.de>, <ehrhardt@mathematik.uni-ulm.de>,
        <linux-kernel@vger.kernel.org>
Subject: Re: VM-related Oops: 2.4.15pre1 
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On Sun, 18 Nov 2001, Horst von Brand wrote:
> Linus Torvalds <torvalds@transmeta.com> said:
> > And nope, not really. It does use plain stores to page->flags, and I agree
> > that it is ugly, but if the page was locked before calling it, all the
> > stores will be with the PG_lock bit set - and even plain stores _are_
> > documented to be atomic on x86 (and on all other reasonable architectures
> > too).
>
> Even unaligned stores?

Actually, even unaligned stores (which page->flags is NOT) are atomic,
even if Intel strongly discourages them (for performance reasons if no
others) and there tends to be documentation that doesn't guarantee it.

		Linus

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