From 3dece370ecc7c6152b3fdd21c6de28179f6e643d Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Fri, 21 Jan 2011 08:49:56 +0100 Subject: [PATCH] mm: System without MMU do not need pte_mkwrite The patch "thp: export maybe_mkwrite" (commit 14fd403f2146) breaks systems without MMU. Error log: CC arch/microblaze/mm/init.o In file included from include/linux/mman.h:14, from arch/microblaze/mm/consistent.c:24: include/linux/mm.h: In function 'maybe_mkwrite': include/linux/mm.h:482: error: implicit declaration of function 'pte_mkwrite' include/linux/mm.h:482: error: incompatible types in assignment Signed-off-by: Michal Simek CC: Andrea Arcangeli Reviewed-by: Rik van Riel CC: Andrew Morton CC: Ingo Molnar Signed-off-by: Linus Torvalds --- include/linux/mm.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 956a35532f47..f6385fc17ad4 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -470,6 +470,7 @@ static inline void set_compound_order(struct page *page, unsigned long order) page[1].lru.prev = (void *)order; } +#ifdef CONFIG_MMU /* * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when * servicing faults for write access. In the normal case, do always want @@ -482,6 +483,7 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) pte = pte_mkwrite(pte); return pte; } +#endif /* * Multiple processes may "see" the same page. E.g. for untouched -- 2.39.5