Commit 06d8fbc7 authored Jun 24, 2016 by Kirill A. Shutemov Committed by Linus Torvalds Jun 24, 2016

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: 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>

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)

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