With the recent nohz scheduler changes, rq's nohz flag
'NOHZ_TICK_STOPPED' and its associated state doesn't get cleared
immediately after the cpu exits idle. This gets cleared as part
of the next tick seen on that cpu.

For the cpu offline support, we need to clear this state
manually. Fix it by registering a cpu notifier, which clears the
nohz idle load balance state for this rq explicitly during the
CPU_DYING notification.

There won't be any nohz updates for that cpu, after the
CPU_DYING notification. But lets be extra paranoid and skip
updating the nohz state in the select_nohz_load_balancer() if
the cpu is not in active state anymore.
Reported-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Reviewed-and-tested-by: NSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Tested-by: NSergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1327026538.16150.40.camel@sbsiddha-desk.sc.intel.comSigned-off-by: NIngo Molnar <mingo@elte.hu>

Commit 029632fb ("sched: Make
separate sched*.c translation units") removed the include of
asm/mutex.h from sched.c.

This breaks the combination of:

 CONFIG_MUTEX_SPIN_ON_OWNER=yes
 CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX=yes

like s390 without mutex debugging:

  CC      kernel/sched/core.o
  kernel/sched/core.c: In function ‘mutex_spin_on_owner’:
  kernel/sched/core.c:3287: error: implicit declaration of function ‘arch_mutex_cpu_relax’

Lets re-add the include to kernel/sched/core.c
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1326268696-30904-1-git-send-email-borntraeger@de.ibm.comSigned-off-by: NIngo Molnar <mingo@elte.hu>

KOSAKI Motohiro noticed the following race:

 > CPU0                    CPU1
 > --------------------------------------------------------
 > deactivate_task()
 >                         task->state = TASK_UNINTERRUPTIBLE;
 > activate_task()
 >    rq->nr_uninterruptible--;
 >
 >                         schedule()
 >                           deactivate_task()
 >                             rq->nr_uninterruptible++;
 >

Kosaki-San's scenario is possible when CPU0 runs
__sched_setscheduler() against CPU1's current @task.

__sched_setscheduler() does a dequeue/enqueue in order to move
the task to its new queue (position) to reflect the newly provided
scheduling parameters. However it should be completely invariant to
nr_uninterruptible accounting, sched_setscheduler() doesn't affect
readyness to run, merely policy on when to run.

So convert the inappropriate activate/deactivate_task usage to
enqueue/dequeue_task, which avoids the nr_uninterruptible accounting.

Also convert the two other sites: __migrate_task() and
normalize_task() that still use activate/deactivate_task. These sites
aren't really a problem since __migrate_task() will only be called on
non-running task (and therefore are immume to the described problem)
and normalize_task() isn't ever used on regular systems.

Also remove the comments from activate/deactivate_task since they're
misleading at best.
Reported-by: NKOSAKI Motohiro <kosaki.motohiro@gmail.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1327486224.2614.45.camel@laptopSigned-off-by: NIngo Molnar <mingo@elte.hu>

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: sha512 - reduce stack usage to safe number
  crypto: sha512 - make it work, undo percpu message schedule

Quoth Ben Myers:
 "Please pull in the following bugfix for xfs.  We forgot to drop a lock on
  error in xfs_readlink.  It hasn't been through -next yet, but there is no
  -next tree tomorrow.  The fix is clear so I'm sending this request today."

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: Fix missing xfs_iunlock() on error recovery path in xfs_readlink()

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  drm/ttm: fix two regressions since move_notify changes
  drm/radeon: avoid deadlock if GPU lockup is detected in ib_pool_get
  drm/radeon: silence out possible lock dependency warning
  drm: Fix authentication kernel crash
  gma500: Fix shmem mapping
  drm/radeon/kms: refine TMDS dual link checks
  drm/radeon/kms: use drm_detect_hdmi_monitor for picking encoder mode
  drm/radeon/kms: rework modeset sequence for DCE41 and DCE5
  drm/radeon/kms: move panel mode setup into encoder mode set
  drm/radeon/kms: move disp eng pll setup to init path
  drm/radeon: finish getting bios earlier
  drm/radeon: fix invalid memory access in radeon_atrm_get_bios()
  drm/radeon/kms: add some missing semaphore init
  drm/radeon/kms: Add an MSI quirk for Dell RS690
  gpu, drm, sis: Don't return uninitialized variable from sis_driver_load()

* 'fix/asoc' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ASoC: wm2000: Fix use-after-free - don't release_firmware() twice on error
  ASoC: wm8958: Use correct format string in dev_err() call
  ASoC: wm8996: Call _POST_PMU callback for CPVDD
  ASoC: mxs: Fix mxs-saif timeout
  ASoC: Disable register synchronisation for low frequency WM8996 SYSCLK
  ASoC: Don't go through cache when applying WM5100 rev A updates
  ASoC: Mark WM5100 register map cache only when going into BIAS_OFF
  ASoC: tlv320aic32x4: always enable analouge block
  ASoC: tlv320aic32x4: always enable dividers
  ASoC: sgtl5000: Fix wrong register name in restore

A fairly simple bugfix for a WARN_ON() which was triggered in the cache
reset support as a result of some subsequent work.  There's only one
mainline user for the code path that's updated right now (wm8994) so
should be low risk.

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: Reset cache status when reinitialsing the cache

 The data encryption was moved from ecryptfs_write_end into
ecryptfs_writepage, this patch moves the corresponding function
comments to be consistent with the modification.
Signed-off-by: NLi Wang <liwang@nudt.edu.cn>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Says Tyler:
 "Tim's logging message update will be really helpful to users when
  they're trying to locate a problematic file in the lower filesystem
  with filename encryption enabled.

  You'll recognize the fix from Li, as you commented on that.

  You should also be familiar with my setattr/truncate improvements,
  since you were the one that pointed them out to us (thanks again!).
  Andrew noted the /dev/ecryptfs write count sanitization needed to be
  improved, so I've got a fix in there for that along with some other
  less important cleanups of the /dev/ecryptfs read/write code."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  eCryptfs: Fix oops when printing debug info in extent crypto functions
  eCryptfs: Remove unused ecryptfs_read()
  eCryptfs: Check inode changes in setattr
  eCryptfs: Make truncate path killable
  eCryptfs: Infinite loop due to overflow in ecryptfs_write()
  eCryptfs: Replace miscdev read/write magic numbers
  eCryptfs: Report errors in writes to /dev/ecryptfs
  eCryptfs: Sanitize write counts of /dev/ecryptfs
  ecryptfs: Remove unnecessary variable initialization
  ecryptfs: Improve metadata read failure logging
  MAINTAINERS: Update eCryptfs maintainer address

If pages passed to the eCryptfs extent-based crypto functions are not
mapped and the module parameter ecryptfs_verbosity=1 was specified at
loading time, a NULL pointer dereference will occur.

Note that this wouldn't happen on a production system, as you wouldn't
pass ecryptfs_verbosity=1 on a production system. It leaks private
information to the system logs and is for debugging only.

The debugging info printed in these messages is no longer very useful
and rather than doing a kmap() in these debugging paths, it will be
better to simply remove the debugging paths completely.

https://launchpad.net/bugs/913651Signed-off-by: NTyler Hicks <tyhicks@canonical.com>
Reported-by: Daniel DeFreez
Cc: <stable@vger.kernel.org>

ecryptfs_read() has been ifdef'ed out for years now and it was
apparently unused before then. It is time to get rid of it for good.
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>

Most filesystems call inode_change_ok() very early in ->setattr(), but
eCryptfs didn't call it at all. It allowed the lower filesystem to make
the call in its ->setattr() function. Then, eCryptfs would copy the
appropriate inode attributes from the lower inode to the eCryptfs inode.

This patch changes that and actually calls inode_change_ok() on the
eCryptfs inode, fairly early in ecryptfs_setattr(). Ideally, the call
would happen earlier in ecryptfs_setattr(), but there are some possible
inode initialization steps that must happen first.

Since the call was already being made on the lower inode, the change in
functionality should be minimal, except for the case of a file extending
truncate call. In that case, inode_newsize_ok() was never being
called on the eCryptfs inode. Rather than inode_newsize_ok() catching
maximum file size errors early on, eCryptfs would encrypt zeroed pages
and write them to the lower filesystem until the lower filesystem's
write path caught the error in generic_write_checks(). This patch
introduces a new function, called ecryptfs_inode_newsize_ok(), which
checks if the new lower file size is within the appropriate limits when
the truncate operation will be growing the lower file.

In summary this change prevents eCryptfs truncate operations (and the
resulting page encryptions), which would exceed the lower filesystem
limits or FSIZE rlimits, from ever starting.
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>
Reviewed-by: NLi Wang <liwang@nudt.edu.cn>
Cc: <stable@vger.kernel.org>

ecryptfs_write() handles the truncation of eCryptfs inodes. It grabs a
page, zeroes out the appropriate portions, and then encrypts the page
before writing it to the lower filesystem. It was unkillable and due to
the lack of sparse file support could result in tying up a large portion
of system resources, while encrypting pages of zeros, with no way for
the truncate operation to be stopped from userspace.

This patch adds the ability for ecryptfs_write() to detect a pending
fatal signal and return as gracefully as possible. The intent is to
leave the lower file in a useable state, while still allowing a user to
break out of the encryption loop. If a pending fatal signal is detected,
the eCryptfs inode size is updated to reflect the modified inode size
and then -EINTR is returned.
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>
Cc: <stable@vger.kernel.org>

ecryptfs_write() can enter an infinite loop when truncating a file to a
size larger than 4G. This only happens on architectures where size_t is
represented by 32 bits.

This was caused by a size_t overflow due to it incorrectly being used to
store the result of a calculation which uses potentially large values of
type loff_t.

[tyhicks@canonical.com: rewrite subject and commit message]
Signed-off-by: NLi Wang <liwang@nudt.edu.cn>
Signed-off-by: NYunchuan Wen <wenyunchuan@kylinos.com.cn>
Reviewed-by: NCong Wang <xiyou.wangcong@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>

ecryptfs_miscdev_read() and ecryptfs_miscdev_write() contained many
magic numbers for specifying packet header field sizes and offsets. This
patch defines those values and replaces the magic values.
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>

Errors in writes to /dev/ecryptfs were being incorrectly reported by
returning 0 or the value of the original write count.

This patch clears up the return code assignment in error paths.
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>

A malicious count value specified when writing to /dev/ecryptfs may
result in a a very large kernel memory allocation.

This patch peeks at the specified packet payload size, adds that to the
size of the packet headers and compares the result with the write count
value. The resulting maximum memory allocation size is approximately 532
bytes.
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>
Reported-by: NSasha Levin <levinsasha928@gmail.com>
Cc: <stable@vger.kernel.org>

Removes unneeded variable initialization in ecryptfs_read_metadata(). Also adds
a small comment to help explain metadata reading logic.

[tyhicks@canonical.com: Pulled out of for-stable patch and wrote commit msg]
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>

Print inode on metadata read failure. The only real
way of dealing with metadata read failures is to delete
the underlying file system file. Having the inode
allows one to 'find . -inum INODE`.

[tyhicks@canonical.com: Removed some minor not-for-stable parts]
Signed-off-by: NTim Gardner <tim.gardner@canonical.com>
Reviewed-by: NKees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>

Update my email address in MAINTAINERS.
Signed-off-by: NDustin Kirkland <dustin.kirkland@gazzang.com>
Signed-off-by: NTyler Hicks <tyhicks@canonical.com>

Both changes in dc97b340 cause serious
regressions in the nouveau driver.

move_notify() was originally able to presume that bo->mem is the old node,
and new_mem is the new node.  The above commit moves the call to
move_notify() to after move() has been done, which means that now, sometimes,
new_mem isn't the new node at all, bo->mem is, and new_mem points at a
stale, possibly-just-been-killed-by-move node.

This is clearly not a good situation.  This patch reverts this change, and
replaces it with a cleanup in the move() failure path instead.

The second issue is that the call to move_notify() from cleanup_memtype_use()
causes the TTM ghost objects to get passed into the driver.  This is clearly
bad as the driver knows nothing about these "fake" TTM BOs, and ends up
accessing uninitialised memory.

I worked around this in nouveau's move_notify() hook by ensuring the BO
destructor was nouveau's.  I don't particularly like this solution, and
would rather TTM never pass the driver these objects.  However, I don't
clearly understand the reason why we're calling move_notify() here anyway
and am happy to work around the problem in nouveau instead of breaking the
behaviour expected by other drivers.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
Reviewed-by: NThomas Hellstrom <thellstrom@vmware.com>
Cc: Jerome Glisse <j.glisse@gmail.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Commit b52a360b forgot to call xfs_iunlock() when it detected corrupted
symplink and bailed out. Fix it by jumping to 'out' instead of doing return.

CC: stable@kernel.org
CC: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: NJan Kara <jack@suse.cz>
Reviewed-by: NAlex Elder <elder@kernel.org>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com> 

If GPU lockup is detected in ib_pool get we are holding the ib_pool
mutex that will be needed by the GPU reset code. As ib_pool code is
safe to be reentrant from GPU reset code we should not block if we
are trying to get the ib pool lock on the behalf of the same userspace
caller, thus use the radeon_mutex_lock helper.
Signed-off-by: NJerome Glisse <jglisse@redhat.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

Silence out the lock dependency warning by moving bo allocation out
of ib mutex protected section. Might lead to useless temporary
allocation but it's not harmful as such things only happen at
initialization.
Signed-off-by: NJerome Glisse <jglisse@redhat.com>
Signed-off-by: NDave Airlie <airlied@redhat.com>

If the master tries to authenticate a client using drm_authmagic and
that client has already closed its drm file descriptor,
either wilfully or because it was terminated, the
call to drm_authmagic will dereference a stale pointer into kmalloc'ed memory
and corrupt it.

Typically this results in a hard system hang.

This patch fixes that problem by removing any authentication tokens
(struct drm_magic_entry) open for a file descriptor when that file
descriptor is closed.
Signed-off-by: NThomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
Signed-off-by: NDave Airlie <airlied@redhat.com>

Quoth Len:
 "This fixes a merge-window regression due to a conflict
  between error injection and preparation to remove atomicio.c
  Here we fix that regression and complete the removal
  of atomicio.c.

  This also re-orders some idle initialization code to
  complete the merge window series that allows cpuidle
  to cope with bringing processors on-line after boot."

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
  Use acpi_os_map_memory() instead of ioremap() in einj driver
  ACPI, APEI, EINJ, cleanup 0 vs NULL confusion
  ACPI, APEI, EINJ Allow empty Trigger Error Action Table
  thermal: Rename generate_netlink_event
  ACPI / PM: Add Sony Vaio VPCCW29FX to nonvs blacklist.
  ACPI: Remove ./drivers/acpi/atomicio.[ch]
  ACPI, APEI: Add RAM mapping support to ACPI
  ACPI, APEI: Add 64-bit read/write support for APEI on i386
  ACPI processor hotplug: Delay acpi_processor_start() call for hotplugged cores
  ACPI processor hotplug: Split up acpi_processor_add

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc: Fix build on some non-freescale platforms
  powerpc/powernv: Fix PCI resource handling
  powerpc/crash: Fix build error without SMP
  powerpc/cpuidle: Make it a bool, not a tristate
  powerpc/85xx: Add dr_mode property in USB nodes
  powerpc/85xx: Enable USB2 controller node for P1020RDB
  powerpc/85xx: Fix cmd12 bug and add the chip compatible for eSDHC
  arch/powerpc/sysdev/fsl_pci.c: add missing iounmap
  powerpc: fix compile error with 85xx/p1022_ds.c

Commit 9deaa53a broke build
on platforms that use legacy_serial.c without also having
CONFIG_SERIAL_8250_FSL enabled due to an unconditional code
to a routine in that module.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

Recent changes to the handling of PCI resources for host bridges
are breaking the PowerNV code for assigning resources on IODA.

The root of the problem is that the pci_bus attached to a host
bridge no longer has its "legacy" resource pointers populated
but only uses the newer list instead.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

Davem says:

1) Fix JIT code generation on x86-64 for divide by zero, from Eric Dumazet.

2) tg3 header length computation correction from Eric Dumazet.

3) More build and reference counting fixes for socket memory cgroup
   code from Glauber Costa.

4) module.h snuck back into a core header after all the hard work we
   did to remove that, from Paul Gortmaker and Jesper Dangaard Brouer.

5) Fix PHY naming regression and add some new PCI IDs in stmmac, from
   Alessandro Rubini.

6) Netlink message generation fix in new team driver, should only advertise
   the entries that changed during events, from Jiri Pirko.

7) SRIOV VF registration and unregistration fixes, and also add a
   missing PCI ID, from Roopa Prabhu.

8) Fix infinite loop in tx queue flush code of brcmsmac, from Stanislaw Gruszka.

9) ftgmac100/ftmac100 build fix, missing interrupt.h include.

10) Memory leak fix in net/hyperv do_set_mutlicast() handling, from Wei Yongjun.

11) Off by one fix in netem packet scheduler, from Vijay Subramanian.

12) TCP loss detection fix from Yuchung Cheng.

13) TCP reset packet MD5 calculation uses wrong address, fix from Shawn Lu.

14) skge carrier assertion and DMA mapping fixes from Stephen Hemminger.

15) Congestion recovery undo performed at the wrong spot in BIC and CUBIC
    congestion control modules, fix from Neal Cardwell.

16) Ethtool ETHTOOL_GSSET_INFO is unnecessarily restrictive, from Michał Mirosław.

17) Fix triggerable race in ipv6 sysctl handling, from Francesco Ruggeri.

18) Statistics bug fixes in mlx4 from Eugenia Emantayev.

19) rds locking bug fix during info dumps, from your's truly.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (67 commits)
  rds: Make rds_sock_lock BH rather than IRQ safe.
  netprio_cgroup.h: dont include module.h from other includes
  net: flow_dissector.c missing include linux/export.h
  team: send only changed options/ports via netlink
  net/hyperv: fix possible memory leak in do_set_multicast()
  drivers/net: dsa/mv88e6xxx.c files need linux/module.h
  stmmac: added PCI identifiers
  llc: Fix race condition in llc_ui_recvmsg
  stmmac: fix phy naming inconsistency
  dsa: Add reporting of silicon revision for Marvell 88E6123/88E6161/88E6165 switches.
  tg3: fix ipv6 header length computation
  skge: add byte queue limit support
  mv643xx_eth: Add Rx Discard and Rx Overrun statistics
  bnx2x: fix compilation error with SOE in fw_dump
  bnx2x: handle CHIP_REVISION during init_one
  bnx2x: allow user to change ring size in ISCSI SD mode
  bnx2x: fix Big-Endianess in ethtool -t
  bnx2x: fixed ethtool statistics for MF modes
  bnx2x: credit-leakage fixup on vlan_mac_del_all
  macvlan: fix a possible use after free
  ...

I could not find cpus_in_crash anywhere in the sourcetree, except for
arch/powerpc/kernel/crash.c. Moving the definition into the CONFIG_SMP
fixes it.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

As pointed out, asm/system.h has empty inline implementations for
update_smt_snooze_delay and pseries_notify_cpuidle_add_cpu, which are
used when CONFIG_PSERIES_IDLE is undefined. Since those two functions
are used in core power architecture functions (store_smt_snooze_delay
at kernel/sysfs.c and smp_xics_setup_cpu at platforms/pseries/smp.c),
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

rds_sock_info() triggers locking warnings because we try to perform a
local_bh_enable() (via sock_i_ino()) while hardware interrupts are
disabled (via taking rds_sock_lock).

There is no reason for rds_sock_lock to be a hardware IRQ disabling
lock, none of these access paths run in hardware interrupt context.

Therefore making it a BH disabling lock is safe and sufficient to
fix this bug.
Reported-by: NKumar Sanghvi <kumaras@chelsio.com>
Reported-by: NJosh Boyer <jwboyer@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A considerable effort was invested in wiping out module.h
from being present in all the other standard includes.  This
one leaked back in, but once again isn't strictly necessary,
so remove it.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The file net/core/flow_dissector.c seems to be missing
including linux/export.h.
Signed-off-by: NJesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch changes event message behaviour to send only updated records
instead of whole list. This fixes bug on which userspace receives non-actual
data in case multiple events occur in row.
Signed-off-by: NJiri Pirko <jpirko@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

do_set_multicast() may not free the memory malloc in
netvsc_set_multicast_list().
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

An implicit instance of module.h leaked back into existence
and was masking the fact that these drivers weren't calling
out the include for itself.  Fix the drivers before we remove
the implicit include path via net/netprio_cgroup.h file.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>