From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Dave Jones <davej@codemonkey.org.uk>
Cc: Jamie Lokier <jamie@shareable.org>, Gerd Knorr <kraxel@suse.de>,
Linus Torvalds <torvalds@transmeta.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andi Kleen <ak@suse.de>
Subject: Re: [patch] vesafb fix
Date: 15 Jul 2003 19:06:41 +0100 [thread overview]
Message-ID: <1058292400.3845.59.camel@dhcp22.swansea.linux.org.uk> (raw)
In-Reply-To: <20030715175358.GB15505@suse.de>
On Maw, 2003-07-15 at 18:53, Dave Jones wrote:
> > The latter failed because it's not suitably aligned - i.e. there was a
> > problem in th logic which splits non-power-of-two regions.
> > Is that fixed these days?
>
> Better would be to use change_page_attr to manipulate PAT bits.
> We then wouldn't have to worry at all about alignment, running out
> of MTRRs, or collisions with other MTRRs.
Not all the MTRR using chips use PAT - but its certainly a start. The
base algorithm for allocating MTRRs as efficiently as sanely possible
is already in the kernel btw - or pretty close to it - its used by
the Winchip code to cover RAM with out of order store.
next prev parent reply other threads:[~2003-07-15 17:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-15 14:10 [patch] vesafb fix Gerd Knorr
2003-07-15 17:35 ` Jamie Lokier
2003-07-15 17:53 ` Dave Jones
2003-07-15 18:06 ` Alan Cox [this message]
2003-07-15 18:22 ` Dave Jones
2003-07-15 18:46 ` Alan Cox
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