linux-kernel - Re: [PATCH 09/12] thp: introduce khugepaged_prealloc_page and khugepaged_alloc

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Date:	Wed, 12 Sep 2012 23:33:47 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	David Rientjes <rientjes@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 09/12] thp: introduce khugepaged_prealloc_page and
 khugepaged_alloc_page

On Wed, 12 Sep 2012, Hugh Dickins wrote:
> > @@ -1825,6 +1825,7 @@ static bool khugepaged_prealloc_page(struct page **hpage, bool *wait)
> >  			return false;
> > 
> >  		*wait = false;
> > +		*hpage = NULL;
> >  		khugepaged_alloc_sleep();
> >  	} else if (*hpage) {
> >  		put_page(*hpage);
> 
> The unshown line just below this is
> 
> 		*hpage = NULL;
> 
> I do wish you would take the "*hpage = NULL;" out of if and else blocks
> and place it once below both.

Hold on, I'm being unreasonable: that's an "else if", and I've no good
reason to request you to set *hpage = NULL when it's already NULL.
It would be okay if you did, but there's no reason for me to prefer it.

Hugh
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