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From: Alan Cox <>
To: Dave Jones <>
Cc: Jamie Lokier <>, Gerd Knorr <>,
	Linus Torvalds <>,
	Linux Kernel Mailing List <>,
	Andi Kleen <>
Subject: Re: [patch] vesafb fix
Date: 15 Jul 2003 19:06:41 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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.

  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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