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Date:   Thu, 7 May 2020 22:17:21 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Linux Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Ira Weiny <ira.weiny@intel.com>
Subject: linux-next: build failure after merge of the akpm-current tree
Message-ID: <20200507221721.0330271c@canb.auug.org.au>
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Hi all,

After merging the akpm-current tree, today's linux-next build (arm
collie_defconfig and many others) failed like this:

arch/arm/mm/dma-mapping.c: In function 'dma_cache_maint_page':
arch/arm/mm/dma-mapping.c:892:6: error: implicit declaration of function 'k=
unmap_high' [-Werror=3Dimplicit-function-declaration]
      kunmap_high(page);
      ^
arch/arm/mm/flush.c: In function '__flush_dcache_page':
arch/arm/mm/flush.c:221:6: error: implicit declaration of function 'kunmap_=
high' [-Werror=3Dimplicit-function-declaration]
      kunmap_high(page + i);
      ^

Caused by commit

  6b66ab470b4d ("arch/kunmap: remove duplicate kunmap implementations")

kunmap_high() is now only declared when CONFIG_HIGHMEM is defined.

--=20
Cheers,
Stephen Rothwell

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