linux-kernel - Re: [PATCH] x86_64/__iowrite32_copy: don't use string move for PIO writes

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Message-ID: <20090709231957.GC1469@ucw.cz>
Date:	Fri, 10 Jul 2009 01:19:57 +0200
From:	Pavel Machek <pavel@....cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"John A. Gregor" <john.gregor@...gic.com>,
	ralph.campbell@...gic.com, linux-kernel@...r.kernel.org,
	johng@...mond.mv.qlogic.com
Subject: Re: [PATCH] x86_64/__iowrite32_copy: don't use string move for PIO
	writes


> - the current code is fine as long as it doesn't cross from cached to
>   uncached memory, which it never should in any kind of sensible driver;

Should we add a comment somewhere saying that is not permitted (and why)?

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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