Hi Michael,

On Mon, 2 Nov 2020 05:19:06 -0500 "Michael S. Tsirkin" <mst@redhat.com> wrote:
>
> On Mon, Nov 02, 2020 at 12:43:27PM +1100, Stephen Rothwell wrote:
> > 
> > After merging the drm-misc tree, today's linux-next build (arm
> > multi_v7_defconfig) failed like this:
> > 
> > In file included from drivers/gpu/drm/nouveau/nouveau_ttm.c:26:
> > include/linux/swiotlb.h: In function 'swiotlb_max_mapping_size':
> > include/linux/swiotlb.h:99:9: error: 'SIZE_MAX' undeclared (first use in this function)
> >    99 |  return SIZE_MAX;
> >       |         ^~~~~~~~
> > include/linux/swiotlb.h:7:1: note: 'SIZE_MAX' is defined in header '<stdint.h>'; did you forget to '#include <stdint.h>'?
> >     6 | #include <linux/init.h>
> >   +++ |+#include <stdint.h>
> >     7 | #include <linux/types.h>
> > include/linux/swiotlb.h:99:9: note: each undeclared identifier is reported only once for each function it appears in
> >    99 |  return SIZE_MAX;
> >       |         ^~~~~~~~
> > 
> > Caused by commit
> > 
> >   abe420bfae52 ("swiotlb: Introduce swiotlb_max_mapping_size()")
> > 
> > but only exposed by commit
> > 
> >   4dbafbd30aef ("drm/nouveu: fix swiotlb include")
> > 
> > I applied the following fix for today:
> > 
> > From: Stephen Rothwell <sfr@canb.auug.org.au>
> > Date: Mon, 2 Nov 2020 12:34:57 +1100
> > Subject: [PATCH] swiotlb: using SIZE_MAX needs limits.h included
> > 
> > Fixes: abe420bfae52 ("swiotlb: Introduce swiotlb_max_mapping_size()")
> > Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>  
> 
> Acked-by: Michael S. Tsirkin <mst@redhat.com>
> 
> I guess it makes sense to pick this up for this release directly.
> I'll merge this unless there are any objections.

Christoph is right that the include should not be conditional.  But I
have not tested that that does not introduce some other problems.

-- 
Cheers,
Stephen Rothwell