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Date: Thu, 16 Jul 2015 14:41:52 +0100
From: Mark Brown <broonie@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
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On Thu, Jul 16, 2015 at 11:05:11AM +0100, Build bot for Mark Brown wrote:

Today's linux-next fails to build an arm64 allnoconfig due to "mm: make
GUP handle pfn mapping unless FOLL_GET is requested" which causes:

> 	arm64-allnoconfig
> ../mm/gup.c:51:4: error: implicit declaration of function 'update_mmu_cache' [-Werror=implicit-function-declaration]

The update_mmu_cache() function is defined unconditionally in
asm/tlbflush.h so there is presumably some path of conditional
inclusions which causes it not to get declared in an allnoconfig - I
didn't chase that down yet.

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