linux-kernel - Re: [PATCH v2] mm/percpu: fix 'defined but not used' warning

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Date:   Tue, 14 Jul 2020 11:41:37 -0700
From:   Roman Gushchin <guro@...com>
To:     Bixuan Cui <cuibixuan@...wei.com>
CC:     Stephen Rothwell <sfr@...b.auug.org.au>,
        <akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linux-next@...r.kernel.org>,
        <john.wanghui@...wei.com>
Subject: Re: [PATCH v2] mm/percpu: fix 'defined but not used' warning

On Tue, Jul 14, 2020 at 09:46:18PM +0800, Bixuan Cui wrote:
> Gcc report the following warning without CONFIG_MEMCG_KMEM:
> 
> mm/percpu-internal.h:145:29: warning: 'pcpu_chunk_type' defined
> but not used [-Wunused-function]
>  static enum pcpu_chunk_type pcpu_chunk_type(struct pcpu_chunk *chunk)
>                              ^~~~~~~~~~~~~~~
> 
> Add 'inline' to pcpu_chunk_type(),pcpu_is_memcg_chunk() and
> pcpu_chunk_list() to clear warning.

Acked-by: Roman Gushchin <guro@...com>

Thank you!

> 
> Fixes: 26c99879ef01 ("mm: memcg/percpu: account percpu memory to memory cgroups")

The "fixes" tag is not valid: the patch is in the mm queue, so it doesn't
have a stable hash. Usually Andrew squashes such fixes into the original patch
on merging.

Thanks!