linux-kernel - Re: [PATCH] mm, arch: Complete pagefault

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Message-Id: <20111005143907.09283b14.akpm@linux-foundation.org>
Date:	Wed, 5 Oct 2011 14:39:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] mm, arch: Complete pagefault_disable abstraction

On Wed, 05 Oct 2011 15:09:29 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> Currently we already have pagefault_{disable,enable}() but they're
> nothing more than a glorified preempt_{disable,enable}().

That's not very accurate or useful.  Unlike preempt_disable(),
pagefault_disable() will raise the preempt count when CONFIG_PREEMPT=n.
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