linux-kernel - Re: [PATCH v3 05/12] Export __get_user_pages

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Message-ID: <20100117154605.GB27123@infradead.org>
Date:	Sun, 17 Jan 2010 10:46:05 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	kvm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, avi@...hat.com, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, hpa@...or.com,
	riel@...hat.com, cl@...ux-foundation.org
Subject: Re: [PATCH v3 05/12] Export __get_user_pages_fast.

On Tue, Jan 05, 2010 at 04:12:47PM +0200, Gleb Natapov wrote:
> KVM will use it to try and find a page without falling back to slow
> gup. That is why get_user_pages_fast() is not enough.

Btw, it seems like currently is declared unconditionally in linux/mm.h
but only implemented by x86, and you code using it needs ifdefs for
that.  I think you should just introduce a stub that always returns
an error here.

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