linux-kernel - [PATCH 2/2] Revert "mm: disable fault around on emulated access bit architecture"

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Date:	Tue, 14 Jun 2016 11:42:30 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	"Huang, Ying" <ying.huang@...el.com>,
	Michal Hocko <mhocko@...e.com>,
	Minchan Kim <minchan@...nel.org>,
	Vinayak Menon <vinmenon@...eaurora.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 2/2] 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.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 mm/memory.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index 61fe7e7b56bf..cd1f29e4897e 100644
--- 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)
-- 
2.8.1