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Commit 06d8fbc7 authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Linus Torvalds
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Revert "mm: disable fault around on emulated access bit architecture" 

This reverts commit d0834a6c.

After revert of 5c0a85fa ("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: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: default avatar"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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 315d09bf

mm/memory.c

+0 −8
Original line number Diff line number Diff line
@@ -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)