linux-kernel - Re: [PATCH 08 of 66] fix bad_page to show the real reason the page is bad

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Message-Id: <20101109120400.BC45.A69D9226@jp.fujitsu.com>
Date:	Tue,  9 Nov 2010 12:03:43 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 08 of 66] fix bad_page to show the real reason the page is bad

> From: Andrea Arcangeli <aarcange@...hat.com>
> 
> page_count shows the count of the head page, but the actual check is done on
> the tail page, so show what is really being checked.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> Acked-by: Rik van Riel <riel@...hat.com>
> Acked-by: Mel Gorman <mel@....ul.ie>
> ---
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5564,7 +5564,7 @@ void dump_page(struct page *page)
>  {
>  	printk(KERN_ALERT
>  	       "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
> -		page, page_count(page), page_mapcount(page),
> +		page, atomic_read(&page->_count), page_mapcount(page),
>  		page->mapping, page->index);
>  	dump_page_flags(page->flags);
>  }

Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>




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