linux-kernel - Re: [PATCH 7/8] mm: reinstate ZERO

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Date:	Tue, 8 Sep 2009 07:13:55 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nick Piggin <npiggin@...e.de>
cc:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 7/8] mm: reinstate ZERO_PAGE



On Tue, 8 Sep 2009, Nick Piggin wrote:
> 
> Without looking closely, why is it a big problem to have a
> !HAVE PTE SPECIAL case? Couldn't it just be a check for
> pfn == zero_pfn that is conditionally compiled away for pte
> special architectures anyway?

At least traditionally, there wasn't a single zero_pfn, but multiple (for 
VIPT caches that have performance issues with aliases). But yeah, we could 
check just the pfn number, and allow any architecture to do it.

			Linus
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