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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