From: Hugh Dickins Date: Fri, 23 Jun 2006 09:03:45 +0000 (-0700) Subject: [PATCH] fix update_mmu_cache in fremap.c X-Git-Tag: v2.6.18-rc1~1081^2~166 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=668e0d8f1a02fd75f1c1e8142a6b08455914242c;p=linux-2.6 [PATCH] fix update_mmu_cache in fremap.c There are two calls to update_mmu_cache in fremap.c, both defective. The one in install_page needs to be accompanied by lazy_mmu_prot_update (some other cleanup time, move that into ia64 update_mmu_cache itself); and the one in install_file_pte should be removed since the pte is not present. Signed-off-by: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/fremap.c b/mm/fremap.c index 9f381e58bf..21b7d0cbc9 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -83,6 +83,7 @@ int install_page(struct mm_struct *mm, struct vm_area_struct *vma, page_add_file_rmap(page); pte_val = *pte; update_mmu_cache(vma, addr, pte_val); + lazy_mmu_prot_update(pte_val); err = 0; unlock: pte_unmap_unlock(pte, ptl); @@ -114,7 +115,13 @@ int install_file_pte(struct mm_struct *mm, struct vm_area_struct *vma, set_pte_at(mm, addr, pte, pgoff_to_pte(pgoff)); pte_val = *pte; - update_mmu_cache(vma, addr, pte_val); + /* + * We don't need to run update_mmu_cache() here because the "file pte" + * being installed by install_file_pte() is not a real pte - it's a + * non-present entry (like a swap entry), noting what file offset should + * be mapped there when there's a fault (in a non-linear vma where + * that's not obvious). + */ pte_unmap_unlock(pte, ptl); err = 0; out: