mm: non-atomically mark page accessed during page cache allocation where possible -fix
Prabhakar Lad reported the following problem
I see following issue on DA850 evm,
git bisect points me to
commit id:
975c3a671f11279441006a29a19f55ccc15fb320
( mm: non-atomically mark page accessed during page cache allocation
where possible)
Unable to handle kernel paging request at virtual address
30e03501
pgd =
c68cc000
[
30e03501] *pgd=
00000000
Internal error: Oops: 1 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 1015 Comm: network.sh Not tainted
3.15.0-rc5-00323-g975c3a6 #9
task:
c70c4e00 ti:
c73d0000 task.ti:
c73d0000
PC is at init_page_accessed+0xc/0x24
LR is at shmem_write_begin+0x54/0x60
pc : [<
c0088aa0>] lr : [<
c00923e8>] psr:
20000013
sp :
c73d1d90 ip :
c73d1da0 fp :
c73d1d9c
r10:
c73d1dec r9 :
00000000 r8 :
00000000
r7 :
c73d1e6c r6 :
c694d7bc r5 :
ffffffe4 r4 :
c73d1dec
r3 :
c73d0000 r2 :
00000001 r1 :
00000000 r0 :
30e03501
Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Control:
0005317f Table:
c68cc000 DAC:
00000015
Process network.sh (pid: 1015, stack limit = 0xc73d01c0)
pagep is set but not pointing to anywhere valid as it's an uninitialised
stack variable. This patch is a fix to
mm-non-atomically-mark-page-accessed-during-page-cache-allocation-where-possible.patch
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reported-by: Prabhakar Lad <prabhakar.csengg@gmail.com>
Tested-by: Prabhakar Lad <prabhakar.csengg@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>