linux-kernel - Re: [PATCHv4 29/39] thp: move maybe_pmd_mkwrite() out of mk_huge

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Date:	Wed, 22 May 2013 07:56:59 -0700
From:	Dave Hansen <dave@...1.net>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 29/39] thp: move maybe_pmd_mkwrite() out of mk_huge_pmd()

On 05/22/2013 07:37 AM, Kirill A. Shutemov wrote:
> Dave Hansen wrote:
>> On 05/11/2013 06:23 PM, Kirill A. Shutemov wrote:
>>> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
>>>
>>> It's confusing that mk_huge_pmd() has sematics different from mk_pte()
>>> or mk_pmd().
>>>
>>> Let's move maybe_pmd_mkwrite() out of mk_huge_pmd() and adjust
>>> prototype to match mk_pte().
>>
>> Was there a motivation to do this beyond adding consistency?  Do you use
>> this later or something?
> 
> I spent some time on debugging problem caused by this inconsistency, so at
> that point I was motivated to fix it. :)

A little anecdote that this bit you in practice to help indicate this
isn't just random code churn would be nice.

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