linux-kernel - Re: [PATCH] - Mapping ACPI tables as CACHED

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Message-id: <alpine.LFD.2.00.1012162149370.20940@x980>
Date:	Thu, 16 Dec 2010 21:54:44 -0500 (EST)
From:	Len Brown <lenb@...nel.org>
To:	Jack Steiner <steiner@....com>
Cc:	hpa@...or.com, Henrique de Moraes Holschuh <hmh@....eng.br>,
	tony.luck@...il.com, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, gbeshers@....com
Subject: Re: [PATCH] - Mapping ACPI tables as CACHED

> I'll bet we can improve the boot sequence so that
> some of the stuff we do before we have cached mappings
> we can do with cached mappings...

Nope, that is a losing bet...

The early mappings are temporary, but they are cached,
for they use __pgprot(__PAGE_KERNEL_IO), which is 
(__PAGE_KERNEL | _PAGE_IOMAP)

rather than __pgprot(__PAGE_KERNEL_IO_NOCACHE) or its variants.

We just need to update the permanent mappings to match.

cheers,
Len Brown, Intel Open Source Technology Center

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