linux-kernel - Re: [PATCH 2/3] perpuc: check pcpu_first_chunk and pcpu_reserved

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Message-ID: <20150722142900.GA1737@dhcp-17-102.nay.redhat.com>
Date:	Wed, 22 Jul 2015 22:29:00 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	cl@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] perpuc: check pcpu_first_chunk and
 pcpu_reserved_chunk to avoid handling them twice

On 07/22/15 at 09:52am, Tejun Heo wrote:
> Hello,
> 
> On Wed, Jul 22, 2015 at 08:03:57AM +0800, Baoquan He wrote:
> > Yes, dyn_size can't be zero. But in pcpu_setup_first_chunk(), the local
> > variable dyn_size could be zero caused by below code:
> > 
> > if (ai->reserved_size) {
> >                 schunk->free_size = ai->reserved_size;
> >                 pcpu_reserved_chunk = schunk;
> >                 pcpu_reserved_chunk_limit = ai->static_size +
> > ai->reserved_size;
> >         } else {
> >                 schunk->free_size = dyn_size;
> >                 dyn_size = 0;                   /* dynamic area covered
> > */
> >         }
> > 
> > So if no reserved_size dyn_size is assigned to zero, and is checked to
> > see if dchunk need be created in below code:
> 
> Hmmm... but then pcpu_reserved_chunk is NULL so there still is no
> duplicate on the list, no?

Yes, you are quite right. I was mistaken. So NACK this patch.

Thanks a lot.
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