linux-kernel - Re: [PATCH -mm 3/3] page-cgroup: fix flags definition

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Message-ID: <20140625065844.GC10223@dhcp22.suse.cz>
Date:	Wed, 25 Jun 2014 08:58:44 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	akpm@...ux-foundation.org, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH -mm 3/3] page-cgroup: fix flags definition

On Tue 24-06-14 20:33:06, Vladimir Davydov wrote:
> Since commit a9ce315aaec1f ("mm: memcontrol: rewrite uncharge API"),

I guess the sha comes from linux-next. Andrew will probably just fold
this into mm-memcontrol-rewrite-uncharge-api.patch but the sha should be
removed otherwise.

> PCG_* flags are used as bit masks, but they are still defined in a enum
> as bit numbers. Fix it.
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>

Acked-by: Michal Hocko <mhocko@...e.cz>

> ---
>  include/linux/page_cgroup.h |   12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/page_cgroup.h b/include/linux/page_cgroup.h
> index fb60e4a466c0..9065a61345a1 100644
> --- a/include/linux/page_cgroup.h
> +++ b/include/linux/page_cgroup.h
> @@ -1,12 +1,10 @@
>  #ifndef __LINUX_PAGE_CGROUP_H
>  #define __LINUX_PAGE_CGROUP_H
>  
> -enum {
> -	/* flags for mem_cgroup */
> -	PCG_USED,	/* This page is charged to a memcg */
> -	PCG_MEM,	/* This page holds a memory charge */
> -	PCG_MEMSW,	/* This page holds a memory+swap charge */
> -};
> +/* flags for mem_cgroup */
> +#define PCG_USED	0x01	/* This page is charged to a memcg */
> +#define PCG_MEM		0x02	/* This page holds a memory charge */
> +#define PCG_MEMSW	0x04	/* This page holds a memory+swap charge */
>  
>  struct pglist_data;
>  
> @@ -44,7 +42,7 @@ struct page *lookup_cgroup_page(struct page_cgroup *pc);
>  
>  static inline int PageCgroupUsed(struct page_cgroup *pc)
>  {
> -	return test_bit(PCG_USED, &pc->flags);
> +	return !!(pc->flags & PCG_USED);
>  }
>  #else /* !CONFIG_MEMCG */
>  struct page_cgroup;
> -- 
> 1.7.10.4
> 

-- 
Michal Hocko
SUSE Labs
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