From: Christoph Hellwig <hch@infradead.org>
To: Jes Sorensen <jes@wildopensource.com>
Cc: Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: returning non-ram via ->nopage, was Re: [patch] mspec driver for 2.6.12-rc2-mm3
Date: Mon, 25 Apr 2005 15:47:49 +0100 [thread overview]
Message-ID: <20050425144749.GA10093@infradead.org> (raw)
In-Reply-To: <yq03btftb9u.fsf@jaguar.mkp.net>
Jes has this shiny new IA64 uncached foo bar whizbang driver (see the patch
at http://marc.theaimsgroup.com/?l=linux-kernel&m=111416930927092&w=2),
which has a nopage routine that calls remap_pfn_range from ->nopage for
uncached memory that's not part of the mem map. Because ->nopage wants
to return a struct page * he's allocating a normal kernel page and actually
returns that one - to get the page he wants into the pagetables his does
all the pagetable manipulation himself before (See the glory details of
pagetable walks and modification inside a driver in the patch above).
I don't think these hacks are acceptable for a driver, especially as the
problem can easily be solved by calling remap_pfn_range in ->mmap - except
SGI also wants node locality..
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next parent reply other threads:[~2005-04-25 14:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <16987.39773.267117.925489@jaguar.mkp.net>
[not found] ` <20050412032747.51c0c514.akpm@osdl.org>
[not found] ` <yq07jj8123j.fsf@jaguar.mkp.net>
[not found] ` <20050413204335.GA17012@infradead.org>
[not found] ` <yq08y3bys4e.fsf@jaguar.mkp.net>
[not found] ` <20050424101615.GA22393@infradead.org>
[not found] ` <yq03btftb9u.fsf@jaguar.mkp.net>
2005-04-25 14:47 ` Christoph Hellwig [this message]
2005-04-26 22:14 ` Jes Sorensen
2005-04-27 15:53 ` Jeff Garzik
2005-04-27 15:55 ` Christoph Hellwig
2005-04-27 18:03 ` Jes Sorensen
2005-04-27 18:55 ` Russell King
2005-05-03 20:40 ` William Lee Irwin III
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