From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reported-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 8 --------
1 file changed, 8 deletions(-)
diff -puN mm/memory.c~revert-mm-disable-fault-around-on-emulated-access-bit-architecture mm/memory.c
--- a/mm/memory.c~revert-mm-disable-fault-around-on-emulated-access-bit-architecture
+++ a/mm/memory.c
@@ -2898,16 +2898,8 @@ void do_set_pte(struct vm_area_struct *v
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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