linux-kernel - Re: [PATCH V4 1/7] mm: memcontrol: add helper of memcg_get_e

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Message-ID: <20210812085823.GC2867@lst.de>
Date:   Thu, 12 Aug 2021 10:58:23 +0200
From:   Christoph Hellwig <hch@....de>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Dan Schatzberg <schatzberg.dan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH V4 1/7] mm: memcontrol: add helper of memcg_get_e_css

On Fri, Aug 06, 2021 at 04:02:56PM +0800, Ming Lei wrote:
> And helper of memcg_get_e_css() so that the consumer needn't to
> call cgroup_get_e_css(cgroup, &memory_cgrp_subsys) directly, since
> &memory_cgrp_subsys has to be used in case that MEMCG is enabled.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Ming Lei <ming.lei@...hat.com>
> ---
>  include/linux/memcontrol.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index bfe5c486f4ad..741852addbd7 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -1101,6 +1101,11 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
>  						gfp_t gfp_mask,
>  						unsigned long *total_scanned);
>  
> +static inline
> +struct cgroup_subsys_state *memcg_get_e_css(struct cgroup_subsys_state *css)

Please avoid this totally weird placement of the static and inline
specifiers.