Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter page_mask usage

From	Andrew Morton <akpm@linux-foundation.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter page_mask usage
Date	2016-07-11 23:20 +0200
Message-ID	<rTQMp-41w-9@gated-at.bofh.it> (permalink)
References	<rT4eK-5W3-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Sun, 10 Jul 2016 01:17:05 +0800 chengang@emindsoft.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.

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Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter  page_mask usage Andrew Morton <akpm@linux-foundation.org> - 2016-07-11 23:20 +0200
  Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter  page_mask usage Chen Gang <chengang@emindsoft.com.cn> - 2016-07-12 19:10 +0200
    Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter  page_mask usage Michal Hocko <mhocko@kernel.org> - 2016-07-13 10:00 +0200
      Re: [PATCH] mm: gup: Re-define follow_page_mask output parameter  page_mask usage Chen Gang <chengang@emindsoft.com.cn> - 2016-07-17 02:20 +0200

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