linux-kernel - Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter page

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Date:	Mon, 11 Jul 2016 14:17:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	chengang@...ndsoft.com.cn
Cc:	vbabka@...e.cz, mhocko@...e.com, kirill.shutemov@...ux.intel.com,
	mingo@...nel.org, dave.hansen@...ux.intel.com,
	dan.j.williams@...el.com, hannes@...xchg.org, jack@...e.cz,
	iamjoonsoo.kim@....com, jmarchan@...hat.com,
	dingel@...ux.vnet.ibm.com, oleg@...hat.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Chen Gang <gang.chen.5i5j@...il.com>
Subject: Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter
 page_mask usage

On Sun, 10 Jul 2016 01:17:05 +0800 chengang@...ndsoft.com.cn wrote:

> For a pure output parameter:
> 
>  - When callee fails, the caller should not assume the output parameter
>    is still valid.
> 
>  - And callee should not assume the pure output parameter must be
>    provided by caller -- caller has right to pass NULL when caller does
>    not care about it.

Sorry, I don't think this one is worth merging really.