linux-kernel - Re: [PATCH] mm: mmap: Check all failures before set values

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Message-ID: <COL130-W94C27965E980E171892A4B9610@phx.gbl>
Date:	Wed, 26 Aug 2015 05:33:42 +0800
From:	Chen Gang <xili_gchen_5257@...mail.com>
To:	Michal Hocko <mhocko@...nel.org>, Chen Gang <gang.chen.5i5j@...com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"riel@...hat.com" <riel@...hat.com>,
	"sasha.levin@...cle.com" <sasha.levin@...cle.com>,
	"gang.chen.5i5j@...il.com" <gang.chen.5i5j@...il.com>,
	Linux Memory <linux-mm@...ck.org>,
	kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: mmap: Check all failures before set values

On 8/25/15 19:35, Michal Hocko wrote:
>
> OK, I guess I understand what you mean. You are certainly right that a
> partial initialization for the failure case is not nice in general. I
> was just objecting that the callers are supposed to free the vma in
> the failure case so any partial initialization doesn't matter in this
> particular case.
>
> Your patch would be more sensible if the failure case was more
> likely. But this function is used for special mappings (vdso, temporary
> vdso stack) which are created early in the process life time so both
> failure paths are highly unlikely. If this was a part of a larger
> changes where the function would be used elsewhere I wouldn't object at
> all.
>

OK.

> The reason I am skeptical about such changes in general is that
> the effect is very marginal while it increases chances of the code
> conflicts.
>
> But as I've said, if others feel this is worthwhile I will not object.
>

OK, I can understand.


Thanks.
--
Chen Gang

Open, share, and attitude like air, water, and life which God blessed