drivers/char/random.c: fix priming of last_data

Commit ec8f02da9e ("random: prime last_data value per fips requirements")
added priming of last_data per fips requirements.  Unfortuantely, it did
so in a way that can lead to multiple threads all incrementing nbytes, but
only one actually doing anything with the extra data, which leads to some
fun random corruption and panics.

The fix is to simply do everything needed to prime last_data in a single
shot, so there's no window for multiple cpus to increment nbytes -- in
fact, we won't even increment or decrement nbytes anymore, we'll just
extract the needed EXTRACT_SIZE one time per pool and then carry on with
the normal routine.

All these changes have been tested across multiple hosts and architectures
where panics were previously encoutered.  The code changes are are
strictly limited to areas only touched when when booted in fips mode.

This change should also go into 3.8-stable, to make the myriads of fips
users on 3.8.x happy.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Tested-by: Jan Stancek <jstancek@redhat.com>
Tested-by: Jan Stodola <jstodola@redhat.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Matt Mackall <mpm@selenic.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mips: define KVM_USER_MEM_SLOTS

ARCH=mips, config=fuloong2e_defconfig:

akpm3:/usr/src/25> make arch/mips/kernel/early_printk.o
...
CC      arch/mips/kernel/asm-offsets.s
In file included from arch/mips/kernel/asm-offsets.c:20:
include/linux/kvm_host.h:334: error: `KVM_USER_MEM_SLOTS' undeclared here (not in a function)

Signed-off-by: Sanjay Lal <sanjayl@kymasys.com>
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

thinkpad-acpi: kill hotkey_thread_mutex

hotkey_kthread() does try_to_freeze() under hotkey_thread_mutex.

We can simply kill this mutex, hotkey_poll_stop_sync() does not need to
serialize with hotkey_kthread().  When kthread_stop() returns the thread
is already dead, it called do_exit()->complete_vfork_done().

Reported-by: Artem Savkov <artem.savkov@gmail.com>
Reported-by: Maciej Rutecki <maciej.rutecki@gmail.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Matthew Garrett <matthew.garrett@nebula.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Reviewed-by: Mandeep Singh Baines <msb@chromium.org>
Cc: Aaron Lu <aaron.lu@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

revert "ipc: don't allocate a copy larger than max"

Revert 88b9e456b164.  Dave has confirmed that this was causing oopses
during trinity testing.

Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Stanislav Kinsbursky <skinsbursky@parallels.com>
Reported-by: Dave Jones <davej@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Merge remote-tracking branch 'lzo-update/lzo-update'

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

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

Conflicts:
arch/mips/kernel/linux32.c
arch/tile/Kconfig
arch/tile/kernel/compat.c
fs/compat.c
fs/read_write.c
fs/read_write.h
fs/splice.c
include/asm-generic/unistd.h

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

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

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

Conflicts:
arch/arm/mach-tegra/tegra.c
drivers/clocksource/tegra20_timer.c

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

Merge remote-tracking branch 'renesas/next'

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Merge remote-tracking branch 'imx-mxs/for-next'

Conflicts:
arch/arm/Kconfig.debug
arch/arm/mach-imx/cpufreq.c
drivers/clocksource/Makefile

Merge remote-tracking branch 'ep93xx/ep93xx-for-next'

Merge remote-tracking branch 'bcm2835/for-next'

Conflicts:
arch/arm/Kconfig
arch/arm/Kconfig.debug

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

Merge remote-tracking branch 'mailbox/dbx500-prcmu-mailbox'

Merge remote-tracking branch 'gen-gpio/for_next'

Conflicts:
arch/sh/kernel/cpu/sh2a/Makefile

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

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

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

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

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drivers/vhost/Makefile

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Merge remote-tracking branch 'bcon/master'

Conflicts:
drivers/block/Kconfig

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

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

Conflicts:
drivers/staging/ccg/f_fs.c
drivers/staging/ccg/rndis.c
drivers/staging/dgrp/dgrp_dpa_ops.c
drivers/staging/dgrp/dgrp_mon_ops.c
drivers/staging/dgrp/dgrp_net_ops.c
drivers/staging/dgrp/dgrp_ports_ops.c
drivers/staging/dgrp/dgrp_specproc.c

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

Conflicts:
drivers/usb/chipidea/udc.c
drivers/usb/gadget/net2272.c
drivers/usb/gadget/net2280.c
drivers/usb/host/ehci-tegra.c

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

Conflicts:
drivers/usb/serial/usb-serial.c

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

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

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

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

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

Conflicts:
drivers/platform/x86/chromeos_laptop.c

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:
drivers/s390/kvm/virtio_ccw.c

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

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

Conflicts:
kernel/trace/ftrace.c

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

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

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

Conflicts:
Documentation/virtual/virtio-spec.txt

Merge remote-tracking branch 'vfio/next'

Merge remote-tracking branch 'iommu/next'

Merge remote-tracking branch 'watchdog/master'

Merge remote-tracking branch 'selinux/master'

Merge remote-tracking branch 'security/next'

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Merge remote-tracking branch 'omap_dss2/for-next'

Merge remote-tracking branch 'battery/master'

Merge remote-tracking branch 'mfd/master'

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

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

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

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

Merge branch 'device-mapper/master'

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

Conflicts:
drivers/block/drbd/drbd_proc.c

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

Conflicts:
include/linux/res_counter.h

Merge remote-tracking branch 'input/next'

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

Conflicts:
drivers/char/virtio_console.c

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

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

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

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

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:
drivers/nfc/microread/mei.c
net/mac80211/sta_info.c
net/wireless/core.h

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

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

Conflicts:
drivers/net/wireless/rt2x00/rt2x00pci.c
drivers/nfc/microread/mei.c

Merge remote-tracking branch 'dmaengine/next'

Conflicts:
drivers/dma/ioat/dma_v3.c

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

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

Merge remote-tracking branch 'thermal/next'

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

Conflicts:
drivers/base/power/qos.c

Merge remote-tracking branch 'idle/next'

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

Merge remote-tracking branch 'pstore/master'

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

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

Conflicts:
drivers/media/pci/bt8xx/bttv-input.c
drivers/media/platform/Kconfig
drivers/staging/media/go7007/go7007-driver.c

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

Merge branch 'jdelvare-hwmon/master'

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

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

Conflicts:
drivers/hid/hid-multitouch.c

Merge remote-tracking branch 'pci/next'

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

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

Conflicts:
fs/xfs/xfs_iomap.c

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

Merge remote-tracking branch 'ocfs2/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 'jfs/jfs-next'

Merge remote-tracking branch 'gfs2/master'

Merge remote-tracking branch 'f2fs/dev'

20130403/ext4

Merge remote-tracking branch 'ext3/for_next'

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