If the kernel may make use of 64 bit addresses outside of the
compatibility address space then we need to set KX such that those
accesses can succeed. Do so for MIPS64 kernels.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11201/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Set the Status.BEV bit throughout the early startup of a secondary core
such that if an exception occurs the core branches to one of the
exception vector entries from cps-vec.S, rather than branching to
whatever is set in EBase.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11200/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

CM3 has 64 bit GCR_ERROR_* registers, but the code in
mips_cm_error_report was previously only reading 32 bits of it in MIPS32
kernels. Fix by splitting the reads for CM2 & CM3, and making use of the
read64_ variants of the accessor function for CM3.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/11189/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

If we run a MIPS32 kernel on a system using CM3 we may still need to
access 64 bit GCRs, as will be done in later patches. Allow this by
having the read64_gcr_* accessor functions perform 2 x 32 bit reads on
those systems.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/11188/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Commit 3885c2b4 ("MIPS: CM: Add support for reporting CM cache
errors") added cases for decoding errors reported by CM3, but leaves the
buf variable which is printed as a string uninitialised for cause values
other than 1, 2 or 3. Fix by ensuring the buf variable is initialised to
an empty string in such cases.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11187/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Commit 3885c2b4 ("MIPS: CM: Add support for reporting CM cache
errors") leads to Malta boards unconditionally reading CM GCRs upon bus
errors, regardless of whether a CM is present. This is incorrect & will
lead to further exceptions. Fix by moving the GCR reads to after the
check for whether a CM is present.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11186/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The documentation for mips_cm_is64 implied that the width of the CM GCRs
would change depending upon the CPU, which is not true. Reword the
explanation to be clearer that the GCR width is purely dependent upon
the version of the CM.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/11185/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

A boundary exists beyond which the timer frequency becomes high enough
that timer interrupts saturate the system and either cause it to slow to
a crawl or stop functioning entirely. Where that boundary lies depends
upon a number of factors such as the overhead of each interrupt and the
overall speed of the CPU, but correlates strongly with the clock
frequency at which the CPU runs. When running on emulators during
bringup or debug of a CPU that clock frequency is very low, which
results in the boundary at which the timer frequency becomes
unsustainable being very low. The current minimum of 48Hz pushes against
boundary in certain situations in current systems. Allow the kernel to
be configured for a 24Hz timer frequency in order to avoid problems on
such slow running systems.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11184/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Rather than #ifdef on CONFIG_KVM_GUEST & redefine the guest kseg0 base
locally, make use of the CAC_BASE macro which has the correct value in
both cases.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-kernel@vger.kernel.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/11183/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

The board code never sets up a leds-pwm device, so including the header
is not necessary.
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11262/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Associate the PWM with the pwm-beeper device using a PWM lookup table.
This will eventually allow the legacy function calls to pwm_request() to
be removed from all consumer drivers.
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11261/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

ARCH_USE_BUILTIN_BSWAP will use __builtin_bswap16(), __builtin_bswap32()
and __builtin_bswap64() where available.  This allows better instruction
scheduling.  On pre-R2 processors it will result in 32 bit and 64 bit
swapping being performed in a call to a __bswapsi2() rsp. __bswapdi2()
functions, so we add these, too.

For a 4.2 kernel with GCC 4.9 this yields the following kernel sizes:

   text    data     bss     dec     hex filename
3996071  155804   88992 4240867  40b5e3 vmlinux         ip22 baseline
3985687  159900   88992 4234579  409d53 vmlinux         ip22 + bswap patch
6913157  378552  251024 7542733  7317cd vmlinux         ip27 baseline
6878581  378552  251024 7508157  7290bd vmlinux         ip27 + bswap patch
5773777  268752  187424 6229953  5f0fc1 vmlinux         malta baseline
5773401  268752  187424 6229577  5f0e49 vmlinux         malta + bswap patch

Presumably the code size improvments yield better cache hit rate thus
better performance compensating for the extra function call but this
will still need to be benchmarked.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

When debugging or examining the performance of a system it can be useful
to examine the effect of L2 prefetching. Provide an optional debugfs
entry to allow a user to enable or disable L2 prefetching.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11182/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

We have many extern declarations of mips_debugfs_dir through arch/mips/
in various C files. Unify them by declaring mips_debugfs_dir in a
header, including it in each affected C file & removing the duplicate
declarations.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-kernel@vger.kernel.org
Cc: Joe Perches <joe@perches.com>
Cc: Jaedon Shin <jaedon.shin@gmail.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: James Cowgill <James.Cowgill@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/11181/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

On systems with CM 2.5 & beyond there may be L2 prefetch units present
which are not enabled by default. Detect them, configuring & enabling
prefetching when available.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/11180/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Introduce new functions in struct bcache_ops to enable & disable L2
cache prefetching, and to retrieve the current state of L2 prefetching.
This will be used in later patches.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11179/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

When debugging it can be helpful to change the policy for compiler use
of MIPSr6 compact branches, in order to rule out or home in on their
involvement in bugs. Allow the GCC -mcompact-branches= flag to be set
via Kconfig under the "Kernel hacking" menu.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11178/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Unsigned values cannot be lesser than zero.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[ralf@linux-mips.org: Chris Dearman's original commit
9318c51a ([MIPS] MIPS32/MIPS64 secondary
cache management) introduced these less than zero checks in 2.6.18.]

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: linux-kernel@vger.kernel.org
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Chris Dearman <chris.dearman@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11165/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Pull USB fixes from Greg KH:
 "Here are three xhci driver fixes for reported issues for 4.3-rc7

  All have been in linux-next for a while with no problems"

* tag 'usb-4.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  xhci: Add spurious wakeup quirk for LynxPoint-LP controllers
  xhci: handle no ping response error properly
  xhci: don't finish a TD if we get a short transfer event mid TD

Pull tty/serial fixes from Greg KH:
 "Here are two fixes that resolve reported issues, one with the 8250
  driver, and the other with the generic fbcon driver.

  Both have been in linux-next for a while"

* tag 'tty-4.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  fbcon: initialize blink interval before calling fb_set_par
  Revert "serial: 8250_dma: don't bother DMA with small transfers"

Pull staging driver fixes from Greg KH:
 "Here are four iio driver fixes for 4.3-rc7, fixing some reported
  issues.  All of these have been in linux-next for a while"

* tag 'staging-4.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  iio: mxs-lradc: Fix temperature offset
  iio: accel: sca3000: memory corruption in sca3000_read_first_n_hw_rb()
  iio: st_accel: fix interrupt handling on LIS3LV02
  iio: adc: twl4030: Fix ADC[3:6] readings

Pull infiniband fixes from Doug Ledford:
 "It's late in the game, I know, but these fixes seemed important enough
  to warrant a late pull request.  They all involve oopses or use after
  frees or corruptions.

  Six serious fixes:

   - Hold the mutex around the find and corresponding update of our gid

   - The ifa list is rcu protected, copy its contents under rcu to avoid
     using a freed structure

   - On error, netdev might be null, so check it before trying to
     release it

   - On init, if workqueue alloc fails, fail init

   - The new demux patches exposed a bug in mlx5 and ipath drivers, we
     need to use the payload P_Key to determine the P_Key the packet
     arrived on because the hardware doesn't tell us the truth

   - Due to a couple convoluted error flows, it is possible for the CM
     to trigger a use_after_free and a double_free of rb nodes.  Add two
     checks to prevent that.  This code has worked for 10+ years.  It is
     likely that some of the recent changes have caused this issue to
     surface.  The current patch will protect us from nasty events for
     now while we track down why this is just now showing up"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma:
  IB/cm: Fix rb-tree duplicate free and use-after-free
  IB/cma: Use inner P_Key to determine netdev
  IB/ucma: check workqueue allocation before usage
  IB/cma: Potential NULL dereference in cma_id_from_event
  IB/core: Fix use after free of ifa
  IB/core: Fix memory corruption in ib_cache_gid_set_default_gid

Pull device mapper fixes from Mike Snitzer:
 "Three stable fixes (two in btree code used by DM thinp and one to
  properly store flags in DM cache metadata's superblock)"

* tag 'dm-4.3-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm cache: the CLEAN_SHUTDOWN flag was not being set
  dm btree: fix leak of bufio-backed block in btree_split_beneath error path
  dm btree remove: fix a bug when rebalancing nodes after removal

Pull block layer fixes from Jens Axboe:
 "A final set of fixes for 4.3.

  It is (again) bigger than I would have liked, but it's all been
  through the testing mill and has been carefully reviewed by multiple
  parties.  Each fix is either a regression fix for this cycle, or is
  marked stable.  You can scold me at KS.  The pull request contains:

   - Three simple fixes for NVMe, fixing regressions since 4.3.  From
     Arnd, Christoph, and Keith.

   - A single xen-blkfront fix from Cathy, fixing a NULL dereference if
     an error is returned through the staste change callback.

   - Fixup for some bad/sloppy code in nbd that got introduced earlier
     in this cycle.  From Markus Pargmann.

   - A blk-mq tagset use-after-free fix from Junichi.

   - A backing device lifetime fix from Tejun, fixing a crash.

   - And finally, a set of regression/stable fixes for cgroup writeback
     from Tejun"

* 'for-linus' of git://git.kernel.dk/linux-block:
  writeback: remove broken rbtree_postorder_for_each_entry_safe() usage in cgwb_bdi_destroy()
  NVMe: Fix memory leak on retried commands
  block: don't release bdi while request_queue has live references
  nvme: use an integer value to Linux errno values
  blk-mq: fix use-after-free in blk_mq_free_tag_set()
  nvme: fix 32-bit build warning
  writeback: fix incorrect calculation of available memory for memcg domains
  writeback: memcg dirty_throttle_control should be initialized with wb->memcg_completions
  writeback: bdi_writeback iteration must not skip dying ones
  writeback: fix bdi_writeback iteration in wakeup_dirtytime_writeback()
  writeback: laptop_mode_timer_fn() needs rcu_read_lock() around bdi_writeback iteration
  nbd: Add locking for tasks
  xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)

Pull Ceph fixes from Sage Weil:
 "Two fixes.

  One is a stopgap to prevent a stack blowout when users have a deep
  chain of image clones.  (We'll rewrite this code to be non-recursive
  for the next window, but in the meantime this is a simple fix that
  avoids a crash.)

  The second fixes a refcount underflow"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  rbd: prevent kernel stack blow up on rbd map
  rbd: don't leak parent_spec in rbd_dev_probe_parent()

Pull btrfs fixes from Chris Mason:
 "I have two more small fixes this week:

  Qu's fix avoids unneeded COW during fallocate, and Christian found a
  memory leak in the error handling of an earlier fix"

* 'for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  btrfs: fix possible leak in btrfs_ioctl_balance()
  btrfs: Avoid truncate tailing page if fallocate range doesn't exceed inode size

If the CLEAN_SHUTDOWN flag is not set when a cache is loaded then all cache
blocks are marked as dirty and a full writeback occurs.

__commit_transaction() is responsible for setting/clearing
CLEAN_SHUTDOWN (based the flags_mutator that is passed in).

Fix this issue, of the cache's on-disk flags being wrong, by making sure
__commit_transaction() does not reset the flags after the mutator has
altered the flags in preparation for them being serialized to disk.

before:

sb_flags = mutator(le32_to_cpu(disk_super->flags));
disk_super->flags = cpu_to_le32(sb_flags);
disk_super->flags = cpu_to_le32(cmd->flags);

after:

disk_super->flags = cpu_to_le32(cmd->flags);
sb_flags = mutator(le32_to_cpu(disk_super->flags));
disk_super->flags = cpu_to_le32(sb_flags);
Reported-by: Bogdan Vasiliev <bogdan.vasiliev@gmail.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org

btree_split_beneath()'s error path had an outstanding FIXME that speaks
directly to the potential for _not_ cleaning up a previously allocated
bufio-backed block.

Fix this by releasing the previously allocated bufio block using
unlock_block().
Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <thornber@redhat.com>
Cc: stable@vger.kernel.org

Commit 4c7e3093 ("dm btree remove: fix bug in redistribute3") wasn't
a complete fix for redistribute3().

The redistribute3 function takes 3 btree nodes and shares out the entries
evenly between them.  If the three nodes in total contained
(MAX_ENTRIES * 3) - 1 entries between them then this was erroneously getting
rebalanced as (MAX_ENTRIES - 1) on the left and right, and (MAX_ENTRIES + 1) in
the center.

Fix this issue by being more careful about calculating the target number
of entries for the left and right nodes.

Unit tested in userspace using this program:
https://github.com/jthornber/redistribute3-test/blob/master/redistribute3_t.cSigned-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org

Mapping an image with a long parent chain (e.g. image foo, whose parent
is bar, whose parent is baz, etc) currently leads to a kernel stack
overflow, due to the following recursion in the reply path:

  rbd_osd_req_callback()
    rbd_obj_request_complete()
      rbd_img_obj_callback()
        rbd_img_parent_read_callback()
          rbd_obj_request_complete()
            ...

Limit the parent chain to 16 images, which is ~5K worth of stack.  When
the above recursion is eliminated, this limit can be lifted.

Fixes: http://tracker.ceph.com/issues/12538

Cc: stable@vger.kernel.org # 3.10+, needs backporting for < 4.2
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Josh Durgin <jdurgin@redhat.com>

Currently we leak parent_spec and trigger a "parent reference
underflow" warning if rbd_dev_create() in rbd_dev_probe_parent() fails.
The problem is we take the !parent out_err branch and that only drops
refcounts; parent_spec that would've been freed had we called
rbd_dev_unparent() remains and triggers rbd_warn() in
rbd_dev_parent_put() - at that point we have parent_spec != NULL and
parent_ref == 0, so counter ends up being -1 after the decrement.

Redo rbd_dev_probe_parent() to fix this.

Cc: stable@vger.kernel.org # 3.10+, needs backporting for < 4.2
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Alex Elder <elder@linaro.org>

Pull x86 fixes from Ingo Molnar:
 "Misc fixes: two KASAN fixes, two EFI boot fixes, two boot-delay
  optimization fixes, and a fix for a IRQ handling hang observed on
  virtual platforms"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm, kasan: Silence KASAN warnings in get_wchan()
  compiler, atomics, kasan: Provide READ_ONCE_NOCHECK()
  x86, kasan: Fix build failure on KASAN=y && KMEMCHECK=y kernels
  x86/smpboot: Fix CPU #1 boot timeout
  x86/smpboot: Fix cpu_init_udelay=10000 corner case boot parameter misbehavior
  x86/ioapic: Disable interrupts when re-routing legacy IRQs
  x86/setup: Extend low identity map to cover whole kernel range
  x86/efi: Fix multiple GOP device support

Pull scheduler fixes from Ingo Molnar:
 "Misc fixes all around the map: an instrumentation fix, a nohz
  usability fix, a lockdep annotation fix and two task group scheduling
  fixes"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/core: Add missing lockdep_unpin() annotations
  sched/deadline: Fix migration of SCHED_DEADLINE tasks
  nohz: Revert "nohz: Set isolcpus when nohz_full is set"
  sched/fair: Update task group's load_avg after task migration
  sched/fair: Fix overly small weight for interactive group entities
  sched, tracing: Stop/start critical timings around the idle=poll idle loop

Merge fixes from Andrew Morton:
 "9 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  ocfs2/dlm: unlock lockres spinlock before dlm_lockres_put
  fault-inject: fix inverted interval/probability values in printk
  lib/Kconfig.debug: disable -Wframe-larger-than warnings with KASAN=y
  mm: make sendfile(2) killable
  thp: use is_zero_pfn() only after pte_present() check
  mailmap: update Javier Martinez Canillas' email
  MAINTAINERS: add Sergey as zsmalloc reviewer
  mm: cma: fix incorrect type conversion for size during dma allocation
  kmod: don't run async usermode helper as a child of kworker thread

Luca and Wanpeng reported two missing annotations that led to
false lockdep complaints. Add the missing annotations.
Reported-by: Luca Abeni <luca.abeni@unitn.it>
Reported-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: cbce1a68 ("sched,lockdep: Employ lock pinning")
Link: http://lkml.kernel.org/r/20151023095008.GY17308@twins.programming.kicks-ass.netSigned-off-by: Ingo Molnar <mingo@kernel.org>

Pull powerpc fixes from Michael Ellerman:

 - Revert "Use the POWER8 Micro Partition Prefetch Engine in KVM HV on
   POWER8" from Paul
 - Handle irq_happened flag correctly in off-line loop from Paul
 - Validate rtas.entry before calling enter_rtas() from Vasant

* tag 'powerpc-4.3-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/rtas: Validate rtas.entry before calling enter_rtas()
  powerpc/powernv: Handle irq_happened flag correctly in off-line loop
  powerpc: Revert "Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8"

Pull ARM SoC fixes from Arnd Bergmann:
 "Most of the changes this time are for incorrect device nodes in
  various ways, on on imx, berlin, exynos, ux500, uniphier, omap and
  meson.

  Chen-Yu Tsai now co-maintains mach-sunxi (Allwinner).

  Other bug fixes include
   - a partial revert of a broken tegra gpio patch
   - irq affinity for arm ccn
   - suspend on one Armada 385 machine
   - enable ZONE_DMA to avoid an OMAP crash for over 2GB RAM
   - turning on a regulator on beagleboard-x15 for HDMI
   - making the omap gpmc debug code visible
   - setup of orion network switch
   - a rare build regression for pxa"

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (22 commits)
  ARM: OMAP2+: Fix imprecise external abort caused by bogus SRAM init
  thermal: exynos: Fix register read in TMU
  ARM: OMAP2+: Fix oops with LPAE and more than 2GB of memory
  ARM: tegra: Comment out gpio-ranges properties
  ARM: dts: uniphier: fix IRQ number for devices on PH1-LD6b ref board
  drivers/perf: arm_pmu: avoid CPU device_node reference leak
  bus: arm-ccn: Fix irq affinity setting on CPU migration
  bus: arm-ccn: Handle correctly no-more-cpus case
  ARM: mvebu: correct a385-db-ap compatible string
  ARM: meson6: DTS: Fix wrong reg mapping and IRQ numbers
  MAINTAINERS: Update Allwinner entry and add new maintainer
  ARM: ux500: modify initial levelshifter status
  ARM: pxa: fix pxa3xx DFI lockup hack
  Documentation: ARM: List new omap MMC requirements
  memory: omap-gpmc: dump "before" state before first modification
  memory: omap-gpmc: Fix unselectable debug option for GPMC
  ARM: dts: am57xx-beagle-x15: set VDD_SD to always-on
  ARM: dts: Fix audio card detection on Peach boards
  ARM: EXYNOS: Fix double of_node_put() when parsing child power domains
  ARM: orion: Fix DSA platform device after mvmdio conversion
  ...

Pull KVM bugfixes from Paolo Bonzini:
 "Bug fixes for ARM, mostly 4.3 regressions related to virtual interrupt
  controller changes"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  arm/arm64: KVM: Fix disabled distributor operation
  arm/arm64: KVM: Clear map->active on pend/active clear
  arm/arm64: KVM: Fix arch timer behavior for disabled interrupts
  KVM: arm: use GIC support unconditionally
  KVM: arm/arm64: Fix memory leak if timer initialization fails
  KVM: arm/arm64: Do not inject spurious interrupts

Merge tag 'trace-fixes-v4.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing fixes from Steven Rostedt:
 "Running tests on other changes, the system locked up due to lots of
  warnings.  It was caused by the stack tracer triggering a warning
  about using rcu_dereference() when RCU was not watching.  This can
  happen due to the fact that the stack tracer uses the function tracer
  to check each function, and there are functions that may be called and
  traced when RCU stopped watching.  Namely when a function is called
  just before going idle or to userspace and after RCU stopped watching
  that current CPU.

  The first patch makes sure that RCU is watching when the stack tracer
  uses RCU.  The second patch is to make sure that the stack tracer does
  not get called by functions in NMI, as it's not NMI safe"

* tag 'trace-fixes-v4.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing: Do not allow stack_tracer to record stack in NMI
  tracing: Have stack tracer force RCU to be watching