Hi all, After merging the powerpc tree, today's linux-next build (powerpc64 allnoconfig) failed like this: arch/powerpc/mm/book3s64/pgtable.c: In function 'flush_partition': arch/powerpc/mm/book3s64/pgtable.c:216:3: error: implicit declaration of function 'radix__flush_all_lpid_guest'; did you mean 'radix__flush_all_lpid'? [-Werror=implicit-function-declaration] 216 | radix__flush_all_lpid_guest(lpid); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ | radix__flush_all_lpid Caused by commit 99161de3a283 ("powerpc/64s/radix: tidy up TLB flushing code") radix__flush_all_lpid_guest() is only declared for CONFIG_PPC_RADIX_MMU which is not set for this build. I am not sure why this did not show up earlier (maybe a Kconfig change?). I added the following hack for today. From: Stephen Rothwell Date: Mon, 30 Sep 2019 10:09:17 +1000 Subject: [PATCH] powerpc/64s/radix: fix for "tidy up TLB flushing code" and !CONFIG_PPC_RADIX_MMU Signed-off-by: Stephen Rothwell --- arch/powerpc/include/asm/book3s/64/tlbflush-radix.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h index 4ce795d30377..ca8db193ae38 100644 --- a/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h +++ b/arch/powerpc/include/asm/book3s/64/tlbflush-radix.h @@ -35,6 +35,10 @@ static inline void radix__flush_all_lpid(unsigned int lpid) { WARN_ON(1); } +static inline void radix__flush_all_lpid_guest(unsigned int lpid) +{ + WARN_ON(1); +} #endif extern void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, -- 2.23.0.rc1 -- Cheers, Stephen Rothwell