linux-kernel - linux-next: build warning after merge of the drm-msm tree

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Date:   Mon, 21 Sep 2020 13:16:24 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <seanpaul@...omium.org>
Cc:     Jordan Crouse <jcrouse@...eaurora.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: linux-next: build warning after merge of the drm-msm tree

Hi all,

After merging the drm-msm tree, today's linux-next build (arm
multi_v7_defconfig) produced this warning:

In file included from include/linux/bitops.h:5,
                 from include/linux/kernel.h:12,
                 from include/linux/ascii85.h:11,
                 from drivers/gpu/drm/msm/adreno/adreno_gpu.c:9:
drivers/gpu/drm/msm/adreno/adreno_gpu.c: In function 'adreno_iommu_create_address_space':
include/linux/bits.h:36:11: warning: right shift count is negative [-Wshift-count-negative]
   36 |   (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
      |           ^~
include/linux/bits.h:38:31: note: in expansion of macro '__GENMASK'
   38 |  (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
      |                               ^~~~~~~~~
drivers/gpu/drm/msm/adreno/adreno_gpu.c:212:11: note: in expansion of macro 'GENMASK'
  212 |   start & GENMASK(48, 0), size);
      |           ^~~~~~~

Introduced by commit

  e3c64c7221f6 ("drm/msm: Set the global virtual address range from the IOMMU domain")

-- 
Cheers,
Stephen Rothwell

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