X-Git-Url: http://git.monstr.eu/?a=blobdiff_plain;f=mm%2Fmprotect.c;h=e3309fcf586bbf89207a468d57517ac3dcbb9ddd;hb=9c897096bbabaca1ad042a35cc1ef441d809ddc8;hp=58b629bb70de3024aba118000f83f52dd92e6d95;hpb=ee95f4059a833839bf52972191b2d4c3d3cec552;p=linux-2.6-microblaze.git

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 58b629bb70de..e3309fcf586b 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -84,6 +84,11 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 				if (!page || PageKsm(page))
 					continue;
 
+				/* Also skip shared copy-on-write pages */
+				if (is_cow_mapping(vma->vm_flags) &&
+				    page_mapcount(page) != 1)
+					continue;
+
 				/* Avoid TLB flush if possible */
 				if (pte_protnone(oldpte))
 					continue;