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

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Date:	Fri, 16 Oct 2015 15:21:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Vladimir Davydov <vdavydov@...tuozzo.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, 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 Oct 2015 15:12:23 -0700 (PDT) Hugh Dickins <hughd@...gle.com> wrote:

> > > --- 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>
> > >  
> 
> Are you expecting to use mem_cgroup_from_kmem() from other places
> in future?  Seems possible; but at present it's called from only
> one place, and (given how memcontrol.h has somehow managed to avoid
> including mm.h all these years), I thought it would be nice to avoid
> it for just this;

Yes, I was wondering about that.  I figured that anything which
includes memcontrol.h is already including mm.h and gcc is pretty
efficient with handling the #ifdef FOO_H_INCLUDED guards.

> and fixed my build with the patch below last night.
> Whatever you all think best: just wanted to point out an alternative.

Yes, that's neater - let's go that way.
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