Revert "mm: disable fault around on emulated access bit architecture"

This reverts commit d0834a6c2c5b0c76cfb806bd7dba6556d8b4edbb.

After revert of 5c0a85fad949 ("mm: make faultaround produce old ptes")
faultaround doesn't have dependencies on hardware accessed bit, so let's
revert this one too.

Link: http://lkml.kernel.org/r/1465893750-44080-3-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <[email protected]>
Reported-by: "Huang, Ying" <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Vinayak Menon <[email protected]>
Cc: Dave Hansen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/memory.c b/mm/memory.c
index 61fe7e7b56bf9f38753f260ffe5c44a0ff4cacb4..cd1f29e4897e3e5207071ed9cccabc55f86e6a87 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2898,16 +2898,8 @@ void do_set_pte(struct vm_area_struct *vma, unsigned long address,
        update_mmu_cache(vma, address, pte);
 }
 
-/*
- * If architecture emulates "accessed" or "young" bit without HW support,
- * there is no much gain with fault_around.
- */
 static unsigned long fault_around_bytes __read_mostly =
-#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
-       PAGE_SIZE;
-#else
        rounddown_pow_of_two(65536);
-#endif
 
 #ifdef CONFIG_DEBUG_FS
 static int fault_around_bytes_get(void *data, u64 *val)