linux-kernel - Re: [PATCH 1/3] mm: print out information of file affected by memory error

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Date:	Thu, 25 Oct 2012 16:34:49 -0400
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Andi Kleen <andi.kleen@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>,
	Akira Fujita <a-fujita@...jp.nec.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/3] mm: print out information of file affected by memory error

Hi Jan,

Thank you for taking time for the review.

On Thu, Oct 25, 2012 at 09:32:49PM +0200, Jan Kara wrote:
> On Thu 25-10-12 11:12:47, Naoya Horiguchi wrote:
> > Printing out the information about which file can be affected by a
> > memory error in generic_error_remove_page() is helpful for user to
> > estimate the impact of the error.
> > 
> > Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> > ---
> >  mm/truncate.c | 8 +++++++-
> >  1 file changed, 7 insertions(+), 1 deletion(-)
> > 
> > diff --git v3.7-rc2.orig/mm/truncate.c v3.7-rc2/mm/truncate.c
> > index d51ce92..df0c6ab7 100644
> > --- v3.7-rc2.orig/mm/truncate.c
> > +++ v3.7-rc2/mm/truncate.c
> > @@ -151,14 +151,20 @@ int truncate_inode_page(struct address_space *mapping, struct page *page)
> >   */
> >  int generic_error_remove_page(struct address_space *mapping, struct page *page)
> >  {
> > +	int ret;
> > +	struct inode *inode = mapping->host;
> > +
>   This will oops if mapping == NULL. Currently the only caller seems to
> check beforehand but still, it's better keep the code as robust as it it.

OK. Adding a comment about it will be helpful for that purpose.

Thanks,
Naoya
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