linux-kernel - linux-next: build failure after merge of the drm-misc tree

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Date:   Mon, 2 Nov 2020 12:43:27 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Intel Graphics <intel-gfx@...ts.freedesktop.org>,
        DRI <dri-devel@...ts.freedesktop.org>
Cc:     Christian König <christian.koenig@....com>,
        Joerg Roedel <jroedel@...e.de>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the drm-misc tree

Hi all,

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@...b.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@...b.auug.org.au>
---
 include/linux/swiotlb.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 513913ff7486..ed9de7855d3b 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -5,6 +5,9 @@
 #include <linux/dma-direction.h>
 #include <linux/init.h>
 #include <linux/types.h>
+#ifndef CONFIG_SWIOTLB
+#include <linux/limits.h>
+#endif
 
 struct device;
 struct page;
-- 
2.28.0

-- 
Cheers,
Stephen Rothwell

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