linux-kernel - Re: [PATCHv2] mm/migrate: clean up useless code in migrate_vma_collect

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Date:   Fri, 16 Aug 2019 21:21:02 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     Ralph Campbell <rcampbell@...dia.com>, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Jan Kara <jack@...e.cz>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] mm/migrate: clean up useless code in
 migrate_vma_collect_pmd()

On Thu, Aug 15, 2019 at 03:40:21PM -0400, Jerome Glisse wrote:
> On Thu, Aug 15, 2019 at 12:23:44PM -0700, Ralph Campbell wrote:
> [...]
> > 
> > I don't understand. The only use of "pfn" I see is in the "else"
> > clause above where it is set just before using it.
> 
> Ok i managed to confuse myself with mpfn and probably with old
> version of the code. Sorry for reading too quickly. Can we move
> unsigned long pfn; into the else { branch so that there is no
> more confusion to its scope.
Looks better, I will update v3.

Thanks,
	Pingfan