linux-kernel - Re: [PATCH 06/24] HWPOISON: abort on failed unmap

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Message-ID: <20091202132819.GC13277@localhost>
Date:	Wed, 2 Dec 2009 21:28:19 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/24] HWPOISON: abort on failed unmap

On Wed, Dec 02, 2009 at 09:11:50PM +0800, Andi Kleen wrote:
> >  	 * Now take care of user space mappings.
> > +	 * Abort on fail: __remove_from_page_cache() assumes unmapped page.
> >  	 */
> > -	hwpoison_user_mappings(p, pfn, trapno);
> > +	if (hwpoison_user_mappings(p, pfn, trapno) != SWAP_SUCCESS) {
> > +		res = -EBUSY;
> > +		goto out;
> 
> It would be good to print something in this case.

OK.

> Did you actually see it during testing?

Perhaps not.

> Or maybe loop forever in the unmapper.

!SWAP_SUCCESS should be rare, so not necessary to loop forever?

Thanks,
Fengguang

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