From: Andi Kleen <ak@suse.de>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: Matthew Wilcox <matthew@wil.cx>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] ioremap_cached()
Date: Thu, 30 Mar 2006 22:27:53 +0200 [thread overview]
Message-ID: <200603302227.53343.ak@suse.de> (raw)
In-Reply-To: <D3AB1B22-E33B-409F-BF54-2F6FD071337A@kernel.crashing.org>
On Thursday 30 March 2006 22:21, Kumar Gala wrote:
>
> On Mar 30, 2006, at 2:17 PM, Andi Kleen wrote:
>
> > On Thursday 30 March 2006 22:14, Matthew Wilcox wrote:
> >
> >> I think you misunderstood. The right interface to call, that should
> >> work everywhere, should be the simple, obvious one. ioremap(). That
> >> effectively is what everyone gets anyway (since they test on x86).
> >> So change the *definition* of ioremap() to be uncached. Then we
> >> can add
> >> ioremap_wc() and ioremap_cached() for these special purpose mappings.
> >
> > That would break all the current users who do ioremap on memory
> > and want it cached.
>
> What's an example of this? I ask since on powerpc ioremap() is
> always _PAGE_NO_CACHE.
ACPI, IPMI, DMI, ... I bet there are more. It's needed every time
a driver needs to look for some firmware table because it might
not be mapped.
-Andi
next prev parent reply other threads:[~2006-03-30 20:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-30 16:41 [PATCH] ioremap_cached() Matthew Wilcox
2006-03-30 18:27 ` Andi Kleen
2006-03-30 19:34 ` Matthew Wilcox
2006-03-30 19:50 ` Andi Kleen
2006-03-30 20:14 ` Matthew Wilcox
2006-03-30 20:17 ` Andi Kleen
2006-03-30 20:21 ` Kumar Gala
2006-03-30 20:27 ` Andi Kleen [this message]
2006-03-31 11:20 ` Arjan van de Ven
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