linux-kernel - Re: [PATCH] mm/ksm.c - Fix compile warnings (PS ignore my formatting in previous email)

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Date:	Wed, 04 Nov 2009 16:58:59 +0530
From:	askb <askb23@...il.com>
To:	wharms@....de
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mm/ksm.c - Fix compile warnings (PS ignore my
 formatting in previous email)

On Wed, 2009-11-04 at 10:57 +0100, walter harms wrote:
> 
> askb schrieb:
> > Found the compiler warning on linux-next: 	
> > 
> > mm/ksm.c: In function ‘ksm_scan_thread’:
> > mm/ksm.c:1083: warning: ‘page2[0u]’ may be used uninitialized in this
> > function
> > mm/ksm.c:1083: note: ‘page2[0u]’ was declared here
> > 
> > fix for the above warning:
> > 
> > Signed-off-by: Anil SB <askb23@...il.com>
> > 
> > diff --git a/mm/ksm.c b/mm/ksm.c
> > index bef1af4..2ea0fd3 100644
> > --- a/mm/ksm.c
> > +++ b/mm/ksm.c
> > @@ -1080,7 +1080,7 @@ static void stable_tree_append(struct rmap_item *rmap_item,
> >   */
> >  static void cmp_and_merge_page(struct page *page, struct rmap_item *rmap_item)
> >  {
> > -	struct page *page2[1];
> > +	struct page *page2[1] = {NULL};
> >  	struct rmap_item *tree_rmap_item;
> >  	unsigned int checksum;
> >  	int err;
> > 
> > 
> 
> a 1 element array looks strange, did you look what kind of magic is here used ?
> 
>>From my understanding, it is used for place holder to check and return
an identical page from stable_tree_search(). Can we do with a double
indirection to struct page instead of the above? 
PS point me in the right direction.

Regards.

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