namespaces, pid_ns: fix leakage on fork() failure

Fork() failure post namespace creation for a child cloned with
CLONE_NEWPID leaks pid_namespace/mnt_cache due to proc being mounted
during creation, but not unmounted during cleanup.  Call
pid_ns_release_proc() during cleanup.

Signed-off-by: Mike Galbraith <efault@gmx.de>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Louis Rilling <louis.rilling@kerlabs.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

hugetlb: prevent BUG_ON in hugetlb_fault() -> hugetlb_cow()

66aebce747eaf ("hugetlb: fix race condition in hugetlb_fault()") added
code to avoid a race condition by elevating the page refcount in
hugetlb_fault() while calling hugetlb_cow().

However, one code path in hugetlb_cow() includes an assertion that the
page count is 1, whereas it may now also have the value 2 in this path.

The consensus is that this BUG_ON has served its purpose, so rather than
extending it to cover both cases, we just remove it.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Hillf Danton <dhillf@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <stable@vger.kernel.org> [3.0.29+, 3.2.16+, 3.3.3+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm: fix division by 0 in percpu_pagelist_fraction()

percpu_pagelist_fraction_sysctl_handler() has only considered -EINVAL as a
possible error from proc_dointvec_minmax().  If any other error is
returned, it would proceed to divide by zero since
percpu_pagelist_fraction wasn't getting initialized at any point.  For
example, writing 0 bytes into the proc file would trigger the issue.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

proc/pid/pagemap: correctly report non-present ptes and holes between vmas

Reset the current pagemap-entry if the current pte isn't present, or if
current vma is over.  Otherwise pagemap reports last entry again and
again.

non-present pte reporting was broken in commit v3.3-3738-g092b50b
("pagemap: introduce data structure for pagemap entry")

reporting for holes was broken in commit v3.3-3734-g5aaabe8
("pagemap: avoid splitting thp when reading /proc/pid/pagemap")

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Reported-by: Pavel Emelyanov <xemul@parallels.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/gpu/drm/gma500/mdfld_device.c: fix build

drivers/gpu/drm/gma500/mdfld_device.c:675: error: expected '}' before ';' token

Repairs "cdv: continue synching up with updated reference code".

Cc: Alan Cox <alan@linux.intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

pagemap.h: fix warning about possibly used before init var

Commit f56f821feb7b36223f309e0ec05986bb137ce418 (linux-next)

    "mm: extend prefault helpers to fault in more than PAGE_SIZE"

added in the new functions:

fault_in_multipages_writeable
fault_in_multipages_readable

However, we currently see:

  include/linux/pagemap.h:492: warning: 'ret' may be used uninitialized in this function
  include/linux/pagemap.h:492: note: 'ret' was declared here

Unlike a lot of gcc nags, this one appears somewhat legit.  i.e.  passing
in an invalid negative value of "size" does make it look like all the
conditionals in there would be bypassed and the uninitialized value would
be returned.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Merge remote-tracking branch 'dma-mapping/dma-mapping-next'

Conflicts:
arch/x86/include/asm/dma-mapping.h

Merge remote-tracking branch 'ep93xx/ep93xx-cleanup'

Merge remote-tracking branch 'arm-soc/for-next'

Conflicts:
arch/arm/mach-ixp2000/enp2611.c
arch/arm/mach-ixp2000/include/mach/platform.h
arch/arm/mach-ixp2000/ixdp2400.c
arch/arm/mach-ixp2000/ixdp2800.c
arch/arm/mach-ixp2000/ixdp2x01.c
arch/arm/mach-ixp2000/pci.c
arch/arm/mach-ixp23xx/include/mach/platform.h
arch/arm/mach-ixp23xx/ixdp2351.c
arch/arm/mach-ixp23xx/pci.c
arch/arm/mach-ixp23xx/roadrunner.c
arch/arm/mach-lpc32xx/common.c
drivers/mfd/ab5500-core.c
lib/Makefile

Merge remote-tracking branch 'gpio/gpio/next'

Merge remote-tracking branch 'modem-shm/for-next'

Conflicts:
drivers/Kconfig

Merge remote-tracking branch 'vhost/linux-next'

Conflicts:
drivers/net/virtio_net.c

Merge remote-tracking branch 'moduleh/for-sfr'

Merge remote-tracking branch 'tegra/for-next'

Merge remote-tracking branch 'pinctrl/for-next'

Conflicts:
Documentation/driver-model/devres.txt
drivers/pinctrl/core.c

Merge remote-tracking branch 'writeback/writeback-for-next'

Merge remote-tracking branch 'tmem/linux-next'

Merge remote-tracking branch 'char-misc/char-misc-next'

Merge remote-tracking branch 'staging/staging-next'

Conflicts:
drivers/Kconfig
drivers/Makefile
drivers/staging/android/Kconfig
drivers/staging/android/Makefile
drivers/staging/line6/driver.c

Merge remote-tracking branch 'usb/usb-next'

Conflicts:
drivers/input/tablet/wacom_wac.c
drivers/usb/core/inode.c
drivers/usb/host/ehci-tegra.c

Merge remote-tracking branch 'tty/tty-next'

Merge remote-tracking branch 'driver-core/driver-core-next'

Merge remote-tracking branch 'regmap/for-next'

Conflicts:
drivers/base/regmap/regmap.c

Merge remote-tracking branch 'drivers-x86/linux-next'

Merge remote-tracking branch 'workqueues/for-next'

Merge remote-tracking branch 'percpu/for-next'

Merge remote-tracking branch 'xen-two/linux-next'

Merge remote-tracking branch 'kvm-ppc/kvm-ppc-next'

Merge remote-tracking branch 'kvm/linux-next'

Conflicts:
Documentation/feature-removal-schedule.txt

Merge remote-tracking branch 'kmemleak/kmemleak'

Merge remote-tracking branch 'rcu/rcu/next'

Merge remote-tracking branch 'tip/auto-latest'

Conflicts:
arch/x86/Kconfig

Merge remote-tracking branch 'spi/spi/next'

Merge remote-tracking branch 'edac-amd/for-next'

Merge remote-tracking branch 'fsnotify/for-next'

Merge remote-tracking branch 'pm/linux-next'

Merge remote-tracking branch 'trivial/for-next'

Conflicts:
sound/soc/imx/Kconfig

Merge remote-tracking branch 'iommu/next'

Merge remote-tracking branch 'watchdog/master'

Merge remote-tracking branch 'selinux/master'

Merge remote-tracking branch 'security/next'

Conflicts:
include/linux/filter.h

Merge remote-tracking branch 'regulator/for-next'

Merge remote-tracking branch 'fbdev/fbdev-next'

Merge remote-tracking branch 'drm/drm-next'

Conflicts:
drivers/gpu/drm/i915/intel_display.c

Merge remote-tracking branch 'mfd/for-next'

Merge remote-tracking branch 'md/for-next'

Merge remote-tracking branch 'slab/for-next'

Merge remote-tracking branch 'mmc/mmc-next'

Merge branch 'quilt/device-mapper'

Merge remote-tracking branch 'block/for-next'

Conflicts:
Documentation/feature-removal-schedule.txt

Merge remote-tracking branch 'cgroup/for-next'

Conflicts:
Documentation/feature-removal-schedule.txt

Merge remote-tracking branch 'input/next'

Merge branch 'quilt/rr'

Conflicts:
arch/arm/kernel/kprobes.c
arch/arm/kernel/smp.c
drivers/virtio/virtio_balloon.c
init/main.c

Merge remote-tracking branch 'sound-asoc/for-next'

Merge remote-tracking branch 'sound/for-next'

Merge remote-tracking branch 'crypto/master'

Merge remote-tracking branch 'l2-mtd/master'

Merge remote-tracking branch 'bluetooth/master'

Merge remote-tracking branch 'wireless-next/master'

Conflicts:
net/wireless/nl80211.c

Merge remote-tracking branch 'net-next/master'

Conflicts:
drivers/net/ethernet/emulex/benet/be.h
drivers/net/ethernet/intel/e1000e/param.c

Merge remote-tracking branch 'slave-dma/next'

Merge remote-tracking branch 'isci/all'

Conflicts:
drivers/scsi/libsas/sas_discover.c
include/scsi/libsas.h

Merge remote-tracking branch 'target-merge/for-next-merge'

Merge remote-tracking branch 'target-updates/for-next'

Merge remote-tracking branch 'scsi/for-next'

Merge remote-tracking branch 'dlm/next'

Merge remote-tracking branch 'ieee1394/for-next'

Merge remote-tracking branch 'infiniband/for-next'

Merge remote-tracking branch 'kconfig/for-next'

Merge remote-tracking branch 'kbuild/for-next'

Merge remote-tracking branch 'v4l-dvb/master'

Conflicts:
drivers/usb/gadget/uvc_queue.c

Merge remote-tracking branch 'hwmon-staging/hwmon-next'

Merge branch 'quilt/jdelvare-hwmon'

Merge remote-tracking branch 'i2c-embedded/i2c-embedded/for-next'

Merge remote-tracking branch 'bjdooks-i2c/next-i2c'

Conflicts:
drivers/i2c/busses/i2c-omap.c

Merge branch 'quilt/i2c'

Merge remote-tracking branch 'hid/for-next'

Merge remote-tracking branch 'pci/next'

Merge remote-tracking branch 'vfs/for-next'

Merge remote-tracking branch 'xfs/for-next'

Merge remote-tracking branch 'ubifs/linux-next'

Merge remote-tracking branch 'nfsd/nfsd-next'

Merge remote-tracking branch 'nfs/linux-next'

Merge remote-tracking branch 'logfs/master'

Merge remote-tracking branch 'gfs2/master'

Merge remote-tracking branch 'fuse/for-next'

Merge remote-tracking branch 'ext4/dev'

Merge remote-tracking branch 'ext3/for_next'

Merge remote-tracking branch 'ecryptfs/next'

Conflicts:
fs/ecryptfs/ecryptfs_kernel.h

Merge remote-tracking branch 'cifs/master'

Merge remote-tracking branch 'ceph/master'

Merge remote-tracking branch 'tile/master'

Merge remote-tracking branch 'sparc-next/master'

Merge remote-tracking branch 'sh/sh-latest'

Merge remote-tracking branch 's390/features'

Merge remote-tracking branch 'mpc5xxx/next'

Merge remote-tracking branch '4xx/next'

powerpc/44x: Add PCI MSI node for Maui APM821xx SoC and Bluestone board in DTS

Signed-off-by: Mai La <mla@apm.com>
Signed-off-by: Josh Boyer <jwboyer@gmail.com>

powerpc/44x: Fix PCI MSI support for Maui APM821xx SoC and Bluestone board

This patch consists of:
- Enable PCI MSI as default for Bluestone board
- Change definition of number of MSI interrupts as it depends on SoC
- Fix returning ENODEV as finding MSI node
- Fix MSI physical high and low address
- Keep MSI data logically

Signed-off-by: Mai La <mla@apm.com>
Signed-off-by: Josh Boyer <jwboyer@gmail.com>

powerpc/47x: Enable CRASH_DUMP

Now that we have KEXEC and relocatable kernel working on 47x (!SMP)
enable CRASH_DUMP.

Signed-off-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Signed-off-by: Josh Boyer <jwboyer@gmail.com>