linux-kernel - Re: [PATCH] cgroup: define empty cftype structure for !CONFIG

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Message-ID: <87094d9f-c6eb-567c-74d9-ff00e4ae5b3c@fb.com>
Date:   Fri, 21 Apr 2017 15:56:36 -0600
From:   Jens Axboe <axboe@...com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Paolo Valente <paolo.valente@...aro.org>,
        Tejun Heo <tj@...nel.org>, "Li Zefan" <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Daniel Mack <daniel@...que.org>,
        Ingo Molnar <mingo@...nel.org>, <cgroups@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cgroup: define empty cftype structure for !CONFIG_CGROUPS

On 04/21/2017 03:41 PM, Arnd Bergmann wrote:
> There is a new forward declaration for two global cftype arrays, but
> that fails to build when CONFIG_CGROUPS is disabled:
> 
> In file included from /git/arm-soc/block/bfq-iosched.c:105:0:
> block/bfq-iosched.h:820:22: error: array type has incomplete element type 'struct cftype'
>  extern struct cftype bfq_blkcg_legacy_files[];
>  extern struct cftype bfq_blkg_files[];
> 
> This adds an empty definition for the type to make it build again.

This was already fixed up yesterday:

http://git.kernel.dk/cgit/linux-block/commit/?h=for-4.12/block&id=659b3394eb67a5e274d7e7348633b508510a5c8f

-- 
Jens Axboe