Introduce read cache which is needed for instruction that require more
then one exit to userspace. After returning from userspace the instruction
will be re-executed with cached read value.
Signed-off-by: NGleb Natapov <gleb@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

cr0.ts may change between entries, so we copy cr0 to HOST_CR0 before each
entry.  That is slow, so instead, set HOST_CR0 to have TS set unconditionally
(which is a safe value), and issue a clts() just before exiting vcpu context
if the task indeed owns the fpu.

Saves ~50 cycles/exit.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Annotate it thusly.
Signed-off-by: NAvi Kivity <avi@redhat.com>

Although we always allocate a new dirty bitmap in x86's get_dirty_log(),
it is only used as a zero-source of copy_to_user() and freed right after
that when memslot is clean. This patch uses clear_user() instead of doing
this unnecessary zero-source allocation.

Performance improvement: as we can expect easily, the time needed to
allocate a bitmap is completely reduced. In my test, the improved ioctl
was about 4 to 10 times faster than the original one for clean slots.
Furthermore, reducing memory allocations and copies will produce good
effects to caches too.
Signed-off-by: NTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: NAvi Kivity <avi@redhat.com>

!! is not needed due to the cast to bool.
Signed-off-by: NAvi Kivity <avi@redhat.com>

In common cases, guest SRAO MCE will cause corresponding poisoned page
be un-mapped and SIGBUS be sent to QEMU-KVM, then QEMU-KVM will relay
the MCE to guest OS.

But it is reported that if the poisoned page is accessed in guest
after unmapping and before MCE is relayed to guest OS, userspace will
be killed.

The reason is as follows. Because poisoned page has been un-mapped,
guest access will cause guest exit and kvm_mmu_page_fault will be
called. kvm_mmu_page_fault can not get the poisoned page for fault
address, so kernel and user space MMIO processing is tried in turn. In
user MMIO processing, poisoned page is accessed again, then userspace
is killed by force_sig_info.

To fix the bug, kvm_mmu_page_fault send HWPOISON signal to QEMU-KVM
and do not try kernel and user space MMIO processing for poisoned
page.

[xiao: fix warning introduced by avi]
Reported-by: NMax Asbock <masbock@linux.vnet.ibm.com>
Signed-off-by: NHuang Ying <ying.huang@intel.com>
Signed-off-by: NXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  x86,kgdb: Fix hw breakpoint regression

* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6:
  [SCSI] ibmvscsi: Fix oops when an interrupt is pending during probe
  [SCSI] zfcp: Update status read mempool
  [SCSI] zfcp: Do not wait for SBALs on stopped queue
  [SCSI] zfcp: Fix check whether unchained ct_els is possible
  [SCSI] ipr: fix resource path display and formatting

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6:
  davinci: da850/omap-l138 evm: account for DEFDCDC{2,3} being tied high
  regulator: tps6507x: allow driver to use DEFDCDC{2,3}_HIGH register
  wm8350-regulator: fix wm8350_register_regulator error handling
  ab3100: fix off-by-one value range checking for voltage selector

The function ecryptfs_uid_hash wrongly assumes that the
second parameter to hash_long() is the number of hash
buckets instead of the number of hash bits.
This patch fixes that and renames the variable
ecryptfs_hash_buckets to ecryptfs_hash_bits to make it
clearer.

Fixes: CVE-2010-2492
Signed-off-by: NAndre Osterhues <aosterhues@escrypt.com>
Signed-off-by: NTyler Hicks <tyhicks@linux.vnet.ibm.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

HW breakpoints events stopped working correctly with kgdb
as a result of commit: 018cbffe
(Merge commit 'v2.6.33' into perf/core).

The regression occurred because the behavior changed for setting
NOTIFY_STOP as the return value to the die notifier if the breakpoint
was known to the HW breakpoint API.  Because kgdb is using the HW
breakpoint API to register HW breakpoints slots, it must also now
implement the overflow_handler call back else kgdb does not get to see
the events from the die notifier.

The kgdb_ll_trap function will be changed to be general purpose code
which can allow an easy way to implement the hw_breakpoint API
overflow call back.
Signed-off-by: NJason Wessel <jason.wessel@windriver.com>
Acked-by: NDongdong Deng <dongdong.deng@windriver.com>
Acked-by: NFrederic Weisbecker <fweisbec@gmail.com>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: use complete_all and wake_up_all
  ceph: Correct obvious typo of Kconfig variable "CRYPTO_AES"
  ceph: fix dentry lease release
  ceph: fix leak of dentry in ceph_init_dentry() error path
  ceph: fix pg_mapping leak on pg_temp updates
  ceph: fix d_release dop for snapdir, snapped dentries
  ceph: avoid dcache readdir for snapdir

If we don't need a huge amount of memory in ->readdir() then
we can use kmalloc rather than vmalloc to allocate it. This
should cut down on the greater overheads associated with
vmalloc for smaller directories.

We may be able to eliminate vmalloc entirely at some stage,
but this is easy to do right away.

Also using GFP_NOFS to avoid any issues wrt to deleting inodes
while under a glock, and suggestion from Linus to factor out
the alloc/dealloc.

I've given this a test with a variety of different sized
directories and it seems to work ok.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Per the da850/omap-l138 Beta EVM SOM schematic, the DEFDCDC2 and
DEFDCDC3 lines are tied high. This leads to a 3.3V IO and 1.2V CVDD
voltage.

Pass the right platform data to the TPS6507x driver so it can operate
on the DEFDCDC{2,3}_HIGH register to read and change voltage levels.
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>

Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

In TPS6507x, depending on the status of DEFDCDC{2,3} pin either
DEFDCDC{2,3}_LOW or DEFDCDC{2,3}_HIGH register needs to be read or
programmed to change the output voltage.

The current driver assumes DEFDCDC{2,3} pins are always tied low
and thus operates only on DEFDCDC{2,3}_LOW register. This need
not always be the case (as is found on OMAP-L138 EVM).

Unfortunately, software cannot read the status of DEFDCDC{2,3} pins.
So, this information is passed through platform data depending on
how the board is wired.
Signed-off-by: NAnuj Aggarwal <anuj.aggarwal@ti.com>
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9p: Pass the correct end of buffer to p9stat_read

When freeing a gpio that has not been exported, gpio_unexport() prints a
debug message when it should just fall through silently.

Example spurious message:

	gpio_unexport: gpio0 status -22
Signed-off-by: NJon Povey <jon.povey@racelogic.co.uk>
Cc: David Brownell <david-b@pacbell.net>
Acked-by: NUwe Kleine-K?nig <u.kleine-koenig@pengutronix.de>
Cc: Gregory Bean <gbean@codeaurora.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The MPC85xx EDAC driver is missing module device aliases, so the driver
won't load automatically on boot.  This patch fixes the issue by adding
proper MODULE_DEVICE_TABLE() macros.
Signed-off-by: NAnton Vorontsov <avorontsov@mvista.com>
Cc: Doug Thompson <dougthompson@xmission.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Dave Jiang <djiang@mvista.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix the logic while writing new date/time to the chip.  The driver
incorrectly wrote back register values to different registers and even
with wrong mask.  The patch adds clearing of the VLF register, which
should be cleared if all date/time values are set.
Signed-off-by: NRudolf Marek <rudolf.marek@sysgo.com>
Acked-by: NWan ZongShun <mcuos.com@gmail.com>
Cc: Martyn Welch <martyn.welch@gefanuc.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The command

	echo "file ec.c +p" >/sys/kernel/debug/dynamic_debug/control

causes an oops.

Move the call to ddebug_remove_module() down into free_module().  In this
way it should be called from all error paths.  Currently, we are missing
the remove if the module init routine fails.
Signed-off-by: NJason Baron <jbaron@redhat.com>
Reported-by: NThomas Renninger <trenn@suse.de>
Tested-by: NThomas Renninger <trenn@suse.de>
Cc: <stable@kernel.org>		[2.6.32+]
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This fixes an issue triggered by running concurrent syncs. One of the syncs
would go through while the other would just hang indefinitely. In any case, we
never actually want to wake a single waiter, so the *_all functions should
be used.
Signed-off-by: NYehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: NSage Weil <sage@newdream.net>

Pass the correct end of the buffer to p9stat_read.
Signed-off-by: NLatchesar Ionkov <lucho@ionkov.net>
Signed-off-by: NEric Van Hensbergen <ericvh@gmail.com>

A driver needs to be ready to take an interrupt as soon as it registers
an interrupt handler. I noticed the following oops when testing kdump:

ipr: IBM Power RAID SCSI Device Driver version: 2.5.0 (February 11, 2010)
ibmvscsi 30000002: SRP_VERSION: 16.a
ibmvscsi 30000002: SRP_VERSION: 16.a
Unable to handle kernel paging request for data at address 0x00000000
...
pc: c000000004085e34: .tasklet_action+0xf4/0x1dc
...
c000000004086fe4 .__do_softirq+0x16c/0x2c0
c00000000403138c .call_do_softirq+0x14/0x24
c00000000400ee14 .do_softirq+0xa0/0x104
c00000000408690c .irq_exit+0x70/0xd0
c00000000400f190 .do_IRQ+0x214/0x2a8
c000000004004804 hardware_interrupt_entry+0x1c/0x98
--- Exception: 501 (Hardware Interrupt) at c00000000400c544 .raw_local_irq_restore+0x48/0x54
c00000000465d2a8 ._raw_spin_unlock_irqrestore+0x74/0xa0
c0000000040e7f00 .__setup_irq+0x2ec/0x3f0
c0000000040e8198 .request_threaded_irq+0x194/0x22c
c00000000446d854 .rpavscsi_init_crq_queue+0x284/0x3f0
c00000000446c764 .ibmvscsi_probe+0x688/0x710
c00000000402903c .vio_bus_probe+0x37c/0x3e4
c000000004403f10 .driver_probe_device+0xec/0x1b8
c000000004404088 .__driver_attach+0xac/0xf4
c000000004403184 .bus_for_each_dev+0x98/0x104
c000000004403c98 .driver_attach+0x40/0x60
c0000000044026f0 .bus_add_driver+0x154/0x324
c0000000044045d0 .driver_register+0xe8/0x1ac
c00000000402b2a8 .vio_register_driver+0x54/0x74
c000000004933ea4 .ibmvscsi_module_init+0x80/0xc0
c000000004009834 .do_one_initcall+0x98/0x1d8
c0000000049005b4 .kernel_init+0x27c/0x33c
c000000004031550 .kernel_thread+0x54/0x70

srp_task needs to be setup before request_irq. The patch below fixes the oops.
Signed-off-by: NAnton Blanchard <anton@samba.org>
Acked-by: NBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>

* 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/perf:
  perf, powerpc: Use perf_sample_data_init() for the FSL code

* git://git.infradead.org/users/cbou/battery-2.6.35:
  ds2782_battery: Rename get_current to fix build failure / name conflict

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
  s2io: fixing DBG_PRINT() macro
  ath9k: fix dma direction for map/unmap in ath_rx_tasklet
  net: dev_forward_skb should call nf_reset
  net sched: fix race in mirred device removal
  tun: avoid BUG, dump packet on GSO errors
  bonding: set device in RLB ARP packet handler
  wimax/i2400m: Add PID & VID for Intel WiMAX 6250
  ipv6: Don't add routes to ipv6 disabled interfaces.
  net: Fix skb_copy_expand() handling of ->csum_start
  net: Fix corruption of skb csum field in pskb_expand_head() of net/core/skbuff.c
  macvtap: Limit packet queue length
  ixgbe/igb: catch invalid VF settings
  bnx2x: Advance a module version
  bnx2x: Protect statistics ramrod and sequence number
  bnx2x: Protect a SM state change
  wireless: use netif_rx_ni in ieee80211_send_layer2_update

We should use perf_sample_data_init() to initialize struct
perf_sample_data.  As explained in the description of commit dc1d628a
("perf: Provide generic perf_sample_data initialization"), it is
possible for userspace to get the kernel to dereference data.raw,
so if it is not initialized, that means that unprivileged userspace
can possibly oops the kernel.  Using perf_sample_data_init makes sure
it gets initialized to NULL.

This conversion should have been included in commit dc1d628a, but it
got missed.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: NKumar Gala <kumar.gala@freescale.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

In the case of platform_device_add() fail, we should call
platform_device_put() instead of platform_device_del()
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>

We use voltage selector as an array index for typ_voltages.
Thus the valid range for voltage selector should be 0..voltages_len-1.
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: NLinus Walleij <linus.walleij@stericsson.com>
Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Do not try to disable hpet if it hasn't been initialized before
  x86, i8259: Only register sysdev if we have a real 8259 PIC

Patch 9e39f7c5 changed the
DBG_PRINT() macro and the if clause was wrongly changed. It means
that currently all the DBG_PRINT are being printed, flooding the
kernel log buffer with things like:

s2io: eth6: Next block at: c0000000b9c90000
s2io: eth6: In Neterion Tx routine
Signed-off-by: NBreno Leitao <leitao@linux.vnet.ibm.com>
Acked-by: NSreenivasa Honnur <Sreenivasa.Honnur@neterion.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] powernow-k8: Limit Pstate transition latency check
  [CPUFREQ] Fix PCC driver error path
  [CPUFREQ] fix double freeing in error path of pcc-cpufreq
  [CPUFREQ] pcc driver should check for pcch method before calling _OSC
  [CPUFREQ] fix memory leak in cpufreq_add_dev
  [CPUFREQ] revert "[CPUFREQ] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site)"

* 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus:
  MIPS: Set io_map_base for several PCI bridges lacking it
  MIPS: Alchemy: Define eth platform devices in the correct order
  MIPS: BCM63xx: Prevent second enet registration on BCM6338
  MIPS: Quit using undefined behavior of ADDU in 64-bit atomic operations.
  MIPS: N32: Define getdents64.
  MIPS: MTX-1: Fix PCI on the MeshCube and related boards
  MIPS: Make init_vdso a subsys_initcall.
  MIPS: "Fix" useless 'init_vdso successfully' message.
  MIPS: PowerTV: Move register setup to before reading registers.
  SOUND: Au1000: Fix section mismatch
  VIDEO: Au1100fb: Fix section mismatch
  VIDEO: PMAGB-B: Fix section mismatch
  VIDEO: PMAG-BA: Fix section mismatch
  NET: declance: Fix section mismatches
  VIDEO. gbefb: Fix section mismatches.

Fix error from the last pull request.  Making sure we shut the panel off
is more correct and saves power.
Signed-off-by: NJesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
  sysfs: allow creating symlinks from untagged to tagged directories
  sysfs: sysfs_delete_link handle symlinks from untagged to tagged directories.
  sysfs: Don't allow the creation of symlinks we can't remove

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6:
  USB: musb: tusb6010: fix compile error with n8x0_defconfig
  USB: FTDI: Add support for the RT System VX-7 radio programming cable
  USB: add quirk for Broadcom BT dongle
  USB: usb-storage: fix initializations of urb fields
  USB: xhci: Set Mult field in endpoint context correctly.
  USB: sisusbvga: Fix for USB 3.0
  USB: adds Artisman USB dongle to list of quirky devices
  USB: xhci: Set EP0 dequeue ptr after reset of configured device.
  USB: Fix USB3.0 Port Speed Downgrade after port reset
  USB: xHCI: Fix another bug in link TRB activation change.
  USB: option: Add support for AMOI Skypephone S2
  USB: New PIDs for Qualcomm gobi 2000 (qcserial)
  USB: ftdi_sio: support for Signalyzer tools based on FTDI chips
  USB: s3c2410_udc: be aware of connected gadget driver
  USB: Expose vendor-specific ACM channel on Nokia 5230
  USB: Add PID for Sierra 250U to drivers/usb/serial/sierra.c
  USB: option: add support for 1da5:4518

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6:
  serial: fix rs485 for atmel_serial on avr32

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/anholt/drm-intel:
  drm/i915: add pipe A force quirks to i915 driver
  drm/i915: Fix panel fitting regression since 734b4157
  drm/i915: fix deadlock in fb teardown
  drm/i915: don't free non-existent compressed llb on ILK+
  agp/intel: Use the correct mask to detect i830 aperture size.
  drm/i915: disable FBC when more than one pipe is active
  drm/i915: Use the correct scanout alignment for fbcon.
  drm/i915: make sure eDP panel is turned on
  drm/i915: add PANEL_UNLOCK_REGS definition
  drm/i915: Make G4X-style PLL search more permissive
  drm/i915: Clear any existing dither mode prior to enabling spatial dithering
  drm/i915: handle shared framebuffers when flipping
  drm/i915: Explosion following OOM in do_execbuffer.
  gpu/drm/i915: Add a blacklist to omit modeset on LID open

The Pstate transition latency check was added for broken F10h BIOSen
which wrongly contain a value of 0 for transition and bus master
latency. Fam11h and later, however, (will) have similar transition
latency so extend that behavior for them too.
Signed-off-by: NBorislav Petkov <borislav.petkov@amd.com>
Signed-off-by: NDave Jones <davej@redhat.com>