UPSTREAM arch: mm: pass userspace fault flag to generic fault handler
authorPrashant Gaikwad <pgaikwad@nvidia.com>
Mon, 12 Aug 2013 10:39:13 +0000 (15:39 +0530)
committerDan Willemsen <dwillemsen@nvidia.com>
Sat, 14 Sep 2013 20:44:01 +0000 (13:44 -0700)
commitaf141cc49eb867c7f885052b29006de44c6d19e9
treee21792858af267f39061fd56fe19f255e9b742d8
parentaaf289f838d57bc2670447d2b9fafa88c85fb025
UPSTREAM arch: mm: pass userspace fault flag to generic fault handler

Unlike global OOM handling, memory cgroup code will invoke the OOM killer
in any OOM situation because it has no way of telling faults occuring in
kernel context - which could be handled more gracefully - from
user-triggered faults.

Pass a flag that identifies faults originating in user space from the
architecture-specific fault handlers to generic code so that memcg OOM
handling can be improved.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: azurIt <azurit@pobox.sk>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
(cherry picked from commit 407c454cb0ac6e68ca66974da787a71118cfef84)

Conflicts:

arch/arc/mm/fault.c
arch/arm64/mm/fault.c
arch/metag/mm/fault.c
arch/parisc/mm/fault.c

Change-Id: Iee53942737627be8dd8e2e325b5ba87fe85d6814
Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Reviewed-on: http://git-master/r/266410
GVS: Gerrit_Virtual_Submit
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
29 files changed:
arch/alpha/mm/fault.c
arch/arc/mm/fault.c
arch/arm/mm/fault.c
arch/arm64/mm/fault.c
arch/avr32/mm/fault.c
arch/cris/mm/fault.c
arch/frv/mm/fault.c
arch/hexagon/mm/vm_fault.c
arch/ia64/mm/fault.c
arch/m32r/mm/fault.c
arch/m68k/mm/fault.c
arch/metag/mm/fault.c
arch/microblaze/mm/fault.c
arch/mips/mm/fault.c
arch/mn10300/mm/fault.c
arch/openrisc/mm/fault.c
arch/parisc/mm/fault.c
arch/powerpc/mm/fault.c
arch/s390/mm/fault.c
arch/score/mm/fault.c
arch/sh/mm/fault.c
arch/sparc/mm/fault_32.c
arch/sparc/mm/fault_64.c
arch/tile/mm/fault.c
arch/um/kernel/trap.c
arch/unicore32/mm/fault.c
arch/x86/mm/fault.c
arch/xtensa/mm/fault.c
include/linux/mm.h