revert "proc: clear_refs: do not clear reserved pages"
Will Deacon [Wed, 25 Apr 2012 23:01:52 +0000 (16:01 -0700)]
Revert commit 85e72aa5384 ("proc: clear_refs: do not clear reserved
pages"), which was a quick fix suitable for -stable until ARM had been
moved over to the gate_vma mechanism:

https://lkml.org/lkml/2012/1/14/55

With commit f9d4861f ("ARM: 7294/1: vectors: use gate_vma for vectors user
mapping"), ARM does now use the gate_vma, so the PageReserved check can be
removed from the proc code.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Nicolas Pitre <nico@linaro.org>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/proc/task_mmu.c

index 2b9a760..2d60492 100644 (file)
@@ -597,9 +597,6 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
                if (!page)
                        continue;
 
-               if (PageReserved(page))
-                       continue;
-
                /* Clear accessed and referenced bits. */
                ptep_test_and_clear_young(vma, addr, pte);
                ClearPageReferenced(page);