[PATCH] ksm: add update_mmu_cache() when changing pte mapping.

[Izik Eidus]

This patch add update_mmu_cache() call right after set_pte_at_notify()
Without this function ksm is probably broken for powerpc and sparc archs.

(Noticed by Hugh Dickins)

Signed-off-by: Izik Eidus <ieidus@xxxxxxxxxx>
---
 mm/ksm.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/ksm.c b/mm/ksm.c
index f7edac3..e8d16eb 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -719,6 +719,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *oldpage,
 	flush_cache_page(vma, addr, pte_pfn(*ptep));
 	ptep_clear_flush(vma, addr, ptep);
 	set_pte_at_notify(mm, addr, ptep, mk_pte(newpage, prot));
+	update_mmu_cache(vma, addr, pte);
 
 	page_remove_rmap(oldpage);
 	put_page(oldpage);
-- 
1.5.6.5

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