linux-kernel - Re: [PATCH] mm, highmem: remove useless virtual variable in page_address

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Message-ID: <20130426002107.GA3075@lge.com>
Date:	Fri, 26 Apr 2013 09:21:07 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH] mm, highmem: remove useless virtual variable in
 page_address_map

On Thu, Apr 25, 2013 at 03:00:57PM -0700, Andrew Morton wrote:
> On Mon, 22 Apr 2013 17:26:28 +0900 Joonsoo Kim <iamjoonsoo.kim@....com> wrote:
> 
> > We can get virtual address without virtual field.
> > So remove it.
> > 
> > ...
> >
> > --- a/mm/highmem.c
> > +++ b/mm/highmem.c
> > @@ -320,7 +320,6 @@ EXPORT_SYMBOL(kunmap_high);
> >   */
> >  struct page_address_map {
> >  	struct page *page;
> > -	void *virtual;
> >  	struct list_head list;
> >  };
> >  
> > @@ -362,7 +361,10 @@ void *page_address(const struct page *page)
> >  
> >  		list_for_each_entry(pam, &pas->lh, list) {
> >  			if (pam->page == page) {
> > -				ret = pam->virtual;
> > +				int nr;
> > +
> > +				nr = pam - page_address_map;
> 
> Doesn't compile.  Presumably you meant page_address_maps.
> 
> I'll drop this - please resend if/when it has been runtime tested.

Sorry for that.
I'll resend when it has been runtime tested.

Thanks.

> 
> 
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