linux-kernel - Re: hexagon: build error in -next due to 'mm: memcontrol: per-lruvec stats infrastructure'

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Date:   Mon, 19 Jun 2017 11:47:17 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Guenter Roeck <private@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: hexagon: build error in -next due to 'mm: memcontrol: per-lruvec
 stats infrastructure'

On Sat, Jun 17, 2017 at 08:37:21AM -0700, Guenter Roeck wrote:
> On Fri, Jun 16, 2017 at 01:37:21PM -0700,  wrote:
> > On Fri, 16 Jun 2017 16:15:23 -0400 Johannes Weiner <hannes@...xchg.org> wrote:
> > 
> > > In any case, memcontrol.h doesn't/shouldn't need hardirq.h. When that
> > > include is removed, the below patch compiles on: x86 allno, x86_64
> > > allno, and my regular x86_64 config:
> > > 
> > > ---
> > > Subject: mm-memcontrol-per-lruvec-stats-infrastructure-fix-4
> > 
> > Did you try x86_64 allmodconfig?  I'm getting a mess:
> > 
> > In file included from ./include/linux/mm.h:1032,
> >                  from ./include/linux/highmem.h:7,
> >                  from ./include/linux/bio.h:21,
> >                  from ./include/linux/writeback.h:205,
> >                  from ./include/linux/memcontrol.h:28,
> >                  from ./include/linux/swap.h:8,
> >                  from ./include/linux/suspend.h:4,
> >                  from arch/x86/kernel/asm-offsets.c:12:
> > ./include/linux/vmstat.h: In function 'lruvec_page_state':
> > ./include/linux/vmstat.h:362: error: implicit declaration of function 'mem_cgroup_disabled'
> > ./include/linux/vmstat.h:365: error: dereferencing pointer to incomplete type
> > ./include/linux/vmstat.h:365: error: type defaults to 'int' in declaration of 'type name'
> > ...
> > 
> > Presumably because we have memcontrol.h indirectly including mm.h which
> > includes vmstat.h (from a stupid place) and with this patch we have
> > vmstat.h including memcontrol.h.
> > 
> 
> How about the following ? Seems to be less invasive, and it fixes the
> immediate problem.
> 
> Guenter
> 
> ---
> From 3aa278a36b5f71ff64b28e0cea05182fbcaa72e6 Mon Sep 17 00:00:00 2001
> From: Guenter Roeck <linux@...ck-us.net>
> Date: Sat, 17 Jun 2017 08:15:57 -0700
> Subject: [PATCH] hexagon: Fix build error caused by include file order
> 
> hexagon builds fail with the following error message.
> In file included from ./include/linux/memcontrol.h:30:0,
>                  from ./include/linux/swap.h:8,
> 		 from ./arch/hexagon/include/asm/pgtable.h:27,
> 		from ./include/linux/mm.h:70,
> 		from arch/hexagon/kernel/asm-offsets.c:28:
> ./include/linux/vmstat.h: In function '__inc_zone_page_state':
> ./include/linux/vmstat.h:294:2: error:
> 	implicit declaration of function 'page_zone'
> 
> Drop unnecessary includes from header files and add missing
> includes to source files to fix the problem.
> 
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Fixes: fb6646f52c45 ("mm: memcontrol: per-lruvec stats infrastructure")
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

If they're not needed, all the better. Thanks!

Acked-by: Johannes Weiner <hannes@...xchg.org>