On Fri, 16 Oct 2015 15:12:23 -0700 (PDT) Hugh Dickins <[email protected]> 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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