linux-kernel - Re: [PATCH] mm: unhide vmstat_text definition for CONFIG

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Message-ID: <20160516073144.GA23146@dhcp22.suse.cz>
Date:	Mon, 16 May 2016 09:31:44 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Joonsoo Kim <iamjoonsoo.kim@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: unhide vmstat_text definition for CONFIG_SMP

On Wed 11-05-16 10:32:11, Christoph Lameter wrote:
> Subject: Do not build vmstat_refresh if there is no procfs support
> 
> It makes no sense to build functionality into the kernel that
> cannot be used and causes build issues.
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>
> 
> Index: linux/mm/vmstat.c
> ===================================================================
> --- linux.orig/mm/vmstat.c
> +++ linux/mm/vmstat.c
> @@ -1358,7 +1358,6 @@ static const struct file_operations proc
>  	.llseek		= seq_lseek,
>  	.release	= seq_release,
>  };
> -#endif /* CONFIG_PROC_FS */
> 
>  #ifdef CONFIG_SMP
>  static struct workqueue_struct *vmstat_wq;

This doesn't work because it makes the whole vmstat_wq depend on
CONFIG_PROC_FS. Which is obviously bad because we both rely on doing the
periodic sync even when counters are not exported to the userspace and
it wound't compile anyway...
-- 
Michal Hocko
SUSE Labs