From 419d8c96dbfa558f00e623023917d0a5afc46129 Mon Sep 17 00:00:00 2001 From: Michel Lespinasse Date: Thu, 10 Feb 2011 15:01:33 -0800 Subject: mlock: do not munlock pages in __do_fault() If the page is going to be written to, __do_page needs to break COW. However, the old page (before breaking COW) was never mapped mapped into the current pte (__do_fault is only called when the pte is not present), so vmscan can't have marked the old page as PageMlocked due to being mapped in __do_fault's VMA. Therefore, __do_fault() does not need to worry about clearing PageMlocked() on the old page. Signed-off-by: Michel Lespinasse Reviewed-by: KAMEZAWA Hiroyuki Acked-by: Hugh Dickins Cc: Rik van Riel Cc: Andrea Arcangeli Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memory.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'mm/memory.c') diff --git a/mm/memory.c b/mm/memory.c index 32df03cf13a5..8e8c18324863 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3051,12 +3051,6 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma, goto out; } charged = 1; - /* - * Don't let another task, with possibly unlocked vma, - * keep the mlocked page. - */ - if (vma->vm_flags & VM_LOCKED) - clear_page_mlock(vmf.page); copy_user_highpage(page, vmf.page, address, vma); __SetPageUptodate(page); } else { -- cgit v1.2.3