linux-kernel - Re: [PATCH] [13/16] HWPOISON: The high level memory error handler in the VM v4

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Date:	Mon, 1 Jun 2009 20:46:58 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"hugh@...itas.com" <hugh@...itas.com>,
	"riel@...hat.com" <riel@...hat.com>,
	"chris.mason@...cle.com" <chris.mason@...cle.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH] [13/16] HWPOISON: The high level memory error handler
	in the VM v4

On Mon, Jun 01, 2009 at 07:16:41PM +0800, Nick Piggin wrote:
> On Fri, May 29, 2009 at 11:35:39PM +0200, Andi Kleen wrote:
> > +	mapping = page_mapping(p);
> > +	if (!PageDirty(p) && !PageWriteback(p) &&
> > +	    !PageAnon(p) && !PageSwapBacked(p) &&
> > +	    mapping && mapping_cap_account_dirty(mapping)) {
> 
> Haven't had another good look at this yet, but if you hold the
> page locked, and have done a wait_on_page_writeback, then
> PageWriteback == true is a kernel bug.

Right, we can eliminate the PageWriteback() test when there is a
wait_on_page_writeback().
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