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

This reverts commit d0834a6c2c.

After revert of 5c0a85fad9 ("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 <kirill.shutemov@linux.intel.com>
Reported-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2016-06-24 14:49:48 -07:00 committed by Linus Torvalds
parent 315d09bf30
commit 06d8fbc7cf
1 changed files with 0 additions and 8 deletions
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8
mm/memory.c
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@ -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)