linux-kernel - Re: [PATCH -V3 5/8] hugetlbfs: Add memcg control files for hugetlbfs

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Message-Id: <20120314043530.d6f3d424.akpm@linux-foundation.org>
Date:	Wed, 14 Mar 2012 04:35:30 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.com, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH -V3 5/8] hugetlbfs: Add memcg control files for
 hugetlbfs

On Wed, 14 Mar 2012 16:40:58 +0530 "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:

> > 
> > > +int mem_cgroup_hugetlb_file_init(struct hstate *h, int idx);
> > 
> > 
> > No, please put it in a header file.  Always.  Where both callers and
> > the implementation see the same propotype.
> > 
> > > +#else
> > > +static int mem_cgroup_hugetlb_file_init(struct hstate *h, int idx)
> > > +{
> > > +	return 0;
> > > +}
> > > +#endif
> > 
> > So this will go into the same header file.
> > 
> 
> I was not sure whether i want to put mem_cgroup_hugetlb_file_init in
> linux/memcontrol.h .

The above is a declaration, not the definition (implementation).

> Ideally i want to have that in mm/hugetlb.c and in
> linux/hugetlb.h. That would require me to make mem_cgroup_read and
> others non static and move few #defines to memcontrol.h. That would
> involve larger code movement which i didn't want to do. ? What do you
> suggest ? Just move mem_cgroup_hugetlb_file_init to memcontrol.h ?

In memcontrol.h:

#ifdef CONFIG_FOO
extern int mem_cgroup_hugetlb_file_init(struct hstate *h, int idx);
#else
static inline int mem_cgroup_hugetlb_file_init(struct hstate *h, int idx)
{
	return 0;
}
#endif

?
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