linux-kernel - Re: [PATCH V3 0/4] Reducing parameters of alloc

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Message-ID: <CA+55aFyLWFYzLkE3orkxKsGciq5eUEtcJE5L0uypNZFcW3h2HQ@mail.gmail.com>
Date:	Tue, 6 Jan 2015 20:53:19 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>
Subject: Re: [PATCH V3 0/4] Reducing parameters of alloc_pages* family of functions

On Mon, Jan 5, 2015 at 8:01 AM, Vlastimil Babka <vbabka@...e.cz> wrote:
>
> Hm, nope. The !CONFIG_COMPACTION variant of try_to_compact_pages() is static
> inline that returns COMPACT_CONTINUE, which is defined in compaction.h.
> Another solution is to add a "forward" declaration (not actually followed later
> by a full definition) of struct alloc_context into compaction.h. Seems to work
> here, but I'm not sure if such thing is allowed?

We do forward struct declarations quite often (well, _relatively_
often) in order to avoid nasty circular header includes, and sometimes
just to avoid unnecessarily many header includes.

See for example

    git grep '\<struct [a-zA-Z_0-9]*;'

it's not exactly rare.

So it's fine.

                        Linus
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