On Tue, Feb 12, 2008 at 06:46:54PM -0800, Andrew Morton wrote:
quoted text
> > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> > --- a/include/linux/memcontrol.h
> > +++ b/include/linux/memcontrol.h
> > @@ -20,9 +20,6 @@
> >  #ifndef _LINUX_MEMCONTROL_H
> >  #define _LINUX_MEMCONTROL_H
> >  
> > -#include <linux/rcupdate.h>
> > -#include <linux/mm.h>
> > -
> >  struct mem_cgroup;
> >  struct page_cgroup;
> >  struct page;
> 
> This really should have been in a separate patch and extensively tested.
> 
> Have we checked that every file which directly or indirectly includes
> memcontrol.h does not have an requirement for rcupdate.h and mm.h, where
> that requirement was satisfied only via this nested inclusion?  For all
> architectures and for all config selections?  Think not.
> 
> Sadly, removal of nested includes is a *big* deal, and it takes quite a lot
> of time to get it all shaken down.
> 
> If we can confirm that all files (.c and .h) which include memcontrol.h
> also directly include rcupdate.h and mm.h then we're _probably_ ok (modulo
> ordering issues).
> 
> Otherwise we should perhaps be taking a second look at how to fix the sparc
> problem.

I've run allmodconfig builds on a bunch of target, FWIW (essentially the
same patch).  Note that these includes are recent addition caused by
added inline function that had since then become a define.  So while I
agree with your comments in general, in _this_ case it's pretty safe.

Commit that had done it is 3062fc67dad01b1d2a15d58c709eff946389eca4
and switch to #define is 60c12b1202a60eabb1c61317e5d2678fcea9893f (BTW,
that warranted mentioning in changelog of the latter).
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