linux-kernel - Re: [PATCH 3/3] memcg: simplify and inline __mem_cgroup_from

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Message-ID: <20151016143629.GE19597@dhcp22.suse.cz>
Date:	Fri, 16 Oct 2015 16:36:30 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Vladimir Davydov <vdavydov@...tuozzo.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] memcg: simplify and inline __mem_cgroup_from_kmem

On Fri 16-10-15 16:17:26, Kirill A. Shutemov wrote:
[...]

I've just encountered the same while updating mmotm git tree. Thanks for
the fix. All other configs which I am testing are good as well.

> virt_to_head_page() is defined in <linux/mm.h> but you don't include it,
> and the commit breaks build for me (on v4.3-rc5-mmotm-2015-10-15-15-20).
> 
>   CC      arch/x86/kernel/asm-offsets.s
> In file included from /home/kas/linux/mm/include/linux/swap.h:8:0,
>                  from /home/kas/linux/mm/include/linux/suspend.h:4,
>                  from /home/kas/linux/mm/arch/x86/kernel/asm-offsets.c:12:
> /home/kas/linux/mm/include/linux/memcontrol.h: In function âmem_cgroup_from_kmemâ:
> /home/kas/linux/mm/include/linux/memcontrol.h:841:9: error: implicit declaration of function âvirt_to_head_pageâ [-Werror=implicit-function-declaration]
>   page = virt_to_head_page(ptr);
>          ^
> /home/kas/linux/mm/include/linux/memcontrol.h:841:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
>   page = virt_to_head_page(ptr);
>        ^
> In file included from /home/kas/linux/mm/include/linux/suspend.h:8:0,
>                  from /home/kas/linux/mm/arch/x86/kernel/asm-offsets.c:12:
> /home/kas/linux/mm/include/linux/mm.h: At top level:
> /home/kas/linux/mm/include/linux/mm.h:452:28: error: conflicting types for âvirt_to_head_pageâ
>  static inline struct page *virt_to_head_page(const void *x)
>                             ^
> In file included from /home/kas/linux/mm/include/linux/swap.h:8:0,
>                  from /home/kas/linux/mm/include/linux/suspend.h:4,
>                  from /home/kas/linux/mm/arch/x86/kernel/asm-offsets.c:12:
> /home/kas/linux/mm/include/linux/memcontrol.h:841:9: note: previous implicit declaration of âvirt_to_head_pageâ was here
>   page = virt_to_head_page(ptr);
>          ^
> cc1: some warnings being treated as errors
> 
> The patch below fixes it for me (and for allmodconfig on x86-64), but I'm not
> sure if it have any side effects on other configurations.
> 
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 47677acb4516..e8e52e502c20 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -26,6 +26,7 @@
>  #include <linux/page_counter.h>
>  #include <linux/vmpressure.h>
>  #include <linux/eventfd.h>
> +#include <linux/mm.h>
>  #include <linux/mmzone.h>
>  #include <linux/writeback.h>
>  
> -- 
>  Kirill A. Shutemov
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
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> see: http://www.linux-mm.org/ .
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-- 
Michal Hocko
SUSE Labs
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