mm, hwpoison: release page on PageHWPoison() in __do_fault()

It seems we forget to release page after detecting HW error.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/iommu/omap-iommu-debug.c: fix decimal permissions

These should have been octal.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/fmc/fmc-write-eeprom.c: fix decimal permissions

This 444 should have been octal.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm, thp: fix infinite loop on memcg OOM

Masayoshi Mizuma reported a bug with the hang of an application under
the memcg limit.  It happens on write-protection fault to huge zero page

If we successfully allocate a huge page to replace zero page but hit the
memcg limit we need to split the zero page with split_huge_page_pmd()
and fallback to small pages.

The other part of the problem is that VM_FAULT_OOM has special meaning
in do_huge_pmd_wp_page() context.  __handle_mm_fault() expects the page
to be split if it sees VM_FAULT_OOM and it will will retry page fault
handling.  This causes an infinite loop if the page was not split.

do_huge_pmd_wp_zero_page_fallback() can return VM_FAULT_OOM if it failed
to allocate one small page, so fallback to small pages will not help.

The solution for this part is to replace VM_FAULT_OOM with
VM_FAULT_FALLBACK is fallback required.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
memcg: change oom_info_lock to mutex

Kirill has reported the following:

  Task in /test killed as a result of limit of /test
  memory: usage 10240kB, limit 10240kB, failcnt 51
  memory+swap: usage 10240kB, limit 10240kB, failcnt 0
  kmem: usage 0kB, limit 18014398509481983kB, failcnt 0
  Memory cgroup stats for /test:

  BUG: sleeping function called from invalid context at kernel/cpu.c:68
  in_atomic(): 1, irqs_disabled(): 0, pid: 66, name: memcg_test
  2 locks held by memcg_test/66:
   #0:  (memcg_oom_lock#2){+.+...}, at: [<ffffffff81131014>] pagefault_out_of_memory+0x14/0x90
   #1:  (oom_info_lock){+.+...}, at: [<ffffffff81197b2a>] mem_cgroup_print_oom_info+0x2a/0x390
  CPU: 2 PID: 66 Comm: memcg_test Not tainted 3.14.0-rc1-dirty #745
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS Bochs 01/01/2011
  Call Trace:
    __might_sleep+0x16a/0x210
    get_online_cpus+0x1c/0x60
    mem_cgroup_read_stat+0x27/0xb0
    mem_cgroup_print_oom_info+0x260/0x390
    dump_header+0x88/0x251
    ? trace_hardirqs_on+0xd/0x10
    oom_kill_process+0x258/0x3d0
    mem_cgroup_oom_synchronize+0x656/0x6c0
    ? mem_cgroup_charge_common+0xd0/0xd0
    pagefault_out_of_memory+0x14/0x90
    mm_fault_error+0x91/0x189
    __do_page_fault+0x48e/0x580
    do_page_fault+0xe/0x10
    page_fault+0x22/0x30

which complains that mem_cgroup_read_stat cannot be called from an atomic
context but mem_cgroup_print_oom_info takes a spinlock.  Change
oom_info_lock to a mutex.

This was introduced by 947b3dd1a84b ("memcg, oom: lock
mem_cgroup_print_oom_info").

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Reported-by: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
ipc,mqueue: remove limits for the amount of system-wide queues

Commit 93e6f119c0ce ("ipc/mqueue: cleanup definition names and
locations") added global hardcoded limits to the amount of message
queues that can be created.  While these limits are per-namespace,
reality is that it ends up breaking userspace applications.
Historically users have, at least in theory, been able to create up to
INT_MAX queues, and limiting it to just 1024 is way too low and dramatic
for some workloads and use cases.  For instance, Madars reports:

 "This update imposes bad limits on our multi-process application.  As
  our app uses approaches that each process opens its own set of queues
  (usually something about 3-5 queues per process).  In some scenarios
  we might run up to 3000 processes or more (which of-course for linux
  is not a problem).  Thus we might need up to 9000 queues or more.  All
  processes run under one user."

Other affected users can be found in launchpad bug #1155695:
  https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/1155695

Instead of increasing this limit, revert it entirely and fallback to the
original way of dealing queue limits -- where once a user's resource
limit is reached, and all memory is used, new queues cannot be created.

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Reported-by: Madars Vitolins <m@silodev.com>
Acked-by: Doug Ledford <dledford@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Cc: <stable@vger.kernel.org>	[3.5+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Makefile: fix extra parenthesis typo when CC_STACKPROTECTOR_REGULAR is enabled

An extra parenthesis typo introduced in 19952a92037e ("stackprotector:
Unify the HAVE_CC_STACKPROTECTOR logic between architectures") is
causing the following error when CONFIG_CC_STACKPROTECTOR_REGULAR is
enabled:

  Makefile:608: Cannot use CONFIG_CC_STACKPROTECTOR: -fstack-protector not supported by compiler
  Makefile:608: *** missing separator.  Stop.

Signed-off-by: Fathi Boudra <fathi.boudra@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
MAINTAINERS: update L: misuses

L: lines are for the email addresses of traditional mailing lists.
W: lines are for URLs.

Convert two L: misuses to W: links.

Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Makefile: fix build with make 3.80 again

According to Documentation/Changes, make 3.80 is still being supported
for building the kernel, hence make files must not make (unconditional)
use of features introduced only in newer versions.  Commit 8779657d29c0
("stackprotector: Introduce CONFIG_CC_STACKPROTECTOR_STRONG") however
introduced an "else ifdef" construct which make 3.80 doesn't understand.

Also correct a warning message still referencing the old config option
name.

Apart from that I question the use of "ifdef" here (but it was used that
way already prior to said commit): ifeq (,y) would seem more to the
point.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Michal Marek <mmarek@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
MAINTAINERS: change mailing list address for Altera UART drivers

The nios2-dev list has been moved to the RocketBoards infrastructure, so
adjust the address accordingly.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Merge branch 'akpm' (patches from Andrew Morton)

Merge misc fixes from Andrew Morton.

* emailed patches from Andrew Morton akpm@linux-foundation.org>:
  MAINTAINERS: change mailing list address for Altera UART drivers
  Makefile: fix build with make 3.80 again
  MAINTAINERS: update L: misuses
  Makefile: fix extra parenthesis typo when CC_STACKPROTECTOR_REGULAR is enabled
  ipc,mqueue: remove limits for the amount of system-wide queues
  memcg: change oom_info_lock to mutex
  mm, thp: fix infinite loop on memcg OOM
  drivers/fmc/fmc-write-eeprom.c: fix decimal permissions
  drivers/iommu/omap-iommu-debug.c: fix decimal permissions
  mm, hwpoison: release page on PageHWPoison() in __do_fault()