From 325f04dbca60a4cfe4ac25e7cf246edd07eb4c5f Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Tue, 29 Nov 2005 16:55:48 +0000 Subject: [PATCH] [PATCH] pfnmap: do_no_page BUG_ON again Use copy_user_highpage directly instead of cow_user_page in do_no_page: in the immediately following page_cache_release, and elsewhere, it is assuming that new_page is normal. If any VM_PFNMAP driver can get to do_no_page, it's just a BUG (but not in the case of do_anonymous_page). Signed-off-by: Hugh Dickins Signed-off-by: Linus Torvalds --- mm/memory.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/mm/memory.c b/mm/memory.c index ae259b6e5a2..5bfa52a9863 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2009,6 +2009,8 @@ static int do_no_page(struct mm_struct *mm, struct vm_area_struct *vma, int anon = 0; pte_unmap(page_table); + BUG_ON(vma->vm_flags & VM_PFNMAP); + if (vma->vm_file) { mapping = vma->vm_file->f_mapping; sequence = mapping->truncate_count; @@ -2041,7 +2043,7 @@ retry: page = alloc_page_vma(GFP_HIGHUSER, vma, address); if (!page) goto oom; - cow_user_page(page, new_page, address); + copy_user_highpage(page, new_page, address); page_cache_release(new_page); new_page = page; anon = 1; -- 2.20.1