linux-kernel - Re: [RFC][PATCH] kmap_atomic

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Message-Id: <1255040942.17055.21.camel@laptop>
Date:	Fri, 09 Oct 2009 00:29:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"hugh.dickins" <hugh.dickins@...cali.co.uk>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [RFC][PATCH] kmap_atomic_push

On Thu, 2009-10-08 at 23:12 +0100, David Howells wrote:
> Do we have any code that uses two slots and then calls more code that
> ultimately requires further slots?  In other words, do we need more than two
> slots?

I can think of code that does a lot more than that, suppose you have
both KM_USER[01], get an interrupt that takes KM_IRQ[01], take an NMI
that takes KM_NMI.

Maybe we can stack the SOFTIRQ ones in as well ;-)

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