Merge remote-tracking branch 'origin/master' into drm-misc-next-fixes

Backmerge 4.12-rc6 into -next-fixes. -next-fixes will contain find patches
for 4.13 merge window

BackMerge tag 'v4.12-rc5' into drm-next

Linux 4.12-rc5 for nouveau fixes

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

The conflicts were two cases of overlapping changes in
batman-adv and the qed driver.

Signed-off-by: David S. Miller <davem@davemloft.n

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

The conflicts were two cases of overlapping changes in
batman-adv and the qed driver.

Signed-off-by: David S. Miller <davem@davemloft.net>

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Merge branches 'pm-cpufreq', 'pm-cpuidle' and 'pm-devfreq'

* pm-cpufreq:
cpufreq: conservative: Allow down_threshold to take values from 1 to 10
Revert "cpufreq: schedutil: Reduce frequencies sl

Merge branches 'pm-cpufreq', 'pm-cpuidle' and 'pm-devfreq'

* pm-cpufreq:
cpufreq: conservative: Allow down_threshold to take values from 1 to 10
Revert "cpufreq: schedutil: Reduce frequencies slower"

* pm-cpuidle:
cpuidle: dt: Add missing 'of_node_put()'

* pm-devfreq:
PM / devfreq: exynos-ppmu: Staticize event list
PM / devfreq: exynos-ppmu: Handle return value of clk_prepare_enable
PM / devfreq: exynos-nocp: Handle return value of clk_prepare_enable

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Merge tag 'v4.12-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into fbdev-for-next

Linux 4.12-rc5

Merge tag 'v4.12-rc5' into ras/core, to pick up fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

Merge branch 'sched/urgent' into x86/mm, to pick up dependent fix

Andy will need the following scheduler fix for the PCID series:

252d2a4117bc: sched/core: Idle_task_exit() shouldn't use switch_m

Merge branch 'sched/urgent' into x86/mm, to pick up dependent fix

Andy will need the following scheduler fix for the PCID series:

252d2a4117bc: sched/core: Idle_task_exit() shouldn't use switch_mm_irqs_off()

So do a cross-merge.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Merge tag 'v4.12-rc5' into for-4.13/block

We've already got a few conflicts and upcoming work depends on some of the
changes that have gone into mainline as regression fixes for this series.

Pull i

Merge tag 'v4.12-rc5' into for-4.13/block

We've already got a few conflicts and upcoming work depends on some of the
changes that have gone into mainline as regression fixes for this series.

Pull in 4.12-rc5 to resolve these conflicts and make it easier on down stream
trees to continue working on 4.13 changes.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Merge 4.12-rc5 into usb-next

We want the USB fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge 4.12-rc5 into staging-next

We want the IIO fixes and other staging driver fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge 4.12-rc5 into char-misc-next

We want the char/misc driver fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc

Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
"A set of fixes in the area of block IO, that should go into the next
-rc release. This contains:

Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
"A set of fixes in the area of block IO, that should go into the next
-rc release. This contains:

- An OOPS fix from Dmitry, fixing a regression with the bio integrity
code in this series.

- Fix truncation of elevator io context cache name, from Eric
Biggers.

- NVMe pull from Christoph includes FC fixes from James, APST
fixes/tweaks from Kai-Heng, removal fix from Rakesh, and an RDMA
fix from Sagi.

- Two tweaks for the block throttling code. One from Joseph Qi,
fixing an oops from the timer code, and one from Shaohua, improving
the behavior on rotatonal storage.

- Two blk-mq fixes from Ming, fixing corner cases with the direct
issue code.

- Locking fix for bfq cgroups from Paolo"

* 'for-linus' of git://git.kernel.dk/linux-block:
block, bfq: access and cache blkg data only when safe
Fix loop device flush before configure v3
blk-throttle: set default latency baseline for harddisk
blk-throttle: fix NULL pointer dereference in throtl_schedule_pending_timer
nvme: relax APST default max latency to 100ms
nvme: only consider exit latency when choosing useful non-op power states
nvme-fc: fix missing put reference on controller create failure
nvme-fc: on lldd/transport io error, terminate association
nvme-rdma: fast fail incoming requests while we reconnect
nvme-pci: fix multiple ctrl removal scheduling
nvme: fix hang in remove path
elevator: fix truncation of icq_cache_name
blk-mq: fix direct issue
blk-mq: pass correct hctx to blk_mq_try_issue_directly
bio-integrity: Do not allocate integrity context for bio w/o data

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block, bfq: access and cache blkg data only when safe

In blk-cgroup, operations on blkg objects are protected with the
request_queue lock. This is no more the lock that protects
I/O-scheduler operat

block, bfq: access and cache blkg data only when safe

In blk-cgroup, operations on blkg objects are protected with the
request_queue lock. This is no more the lock that protects
I/O-scheduler operations in blk-mq. In fact, the latter are now
protected with a finer-grained per-scheduler-instance lock. As a
consequence, although blkg lookups are also rcu-protected, blk-mq I/O
schedulers may see inconsistent data when they access blkg and
blkg-related objects. BFQ does access these objects, and does incur
this problem, in the following case.

The blkg_lookup performed in bfq_get_queue, being protected (only)
through rcu, may happen to return the address of a copy of the
original blkg. If this is the case, then the blkg_get performed in
bfq_get_queue, to pin down the blkg, is useless: it does not prevent
blk-cgroup code from destroying both the original blkg and all objects
directly or indirectly referred by the copy of the blkg. BFQ accesses
these objects, which typically causes a crash for NULL-pointer
dereference of memory-protection violation.

Some additional protection mechanism should be added to blk-cgroup to
address this issue. In the meantime, this commit provides a quick
temporary fix for BFQ: cache (when safe) blkg data that might
disappear right after a blkg_lookup.

In particular, this commit exploits the following facts to achieve its
goal without introducing further locks. Destroy operations on a blkg
invoke, as a first step, hooks of the scheduler associated with the
blkg. And these hooks are executed with bfqd->lock held for BFQ. As a
consequence, for any blkg associated with the request queue an
instance of BFQ is attached to, we are guaranteed that such a blkg is
not destroyed, and that all the pointers it contains are consistent,
while that instance is holding its bfqd->lock. A blkg_lookup performed
with bfqd->lock held then returns a fully consistent blkg, which
remains consistent until this lock is held. In more detail, this holds
even if the returned blkg is a copy of the original one.

Finally, also the object describing a group inside BFQ needs to be
protected from destruction on the blkg_free of the original blkg
(which invokes bfq_pd_free). This commit adds private refcounting for
this object, to let it disappear only after no bfq_queue refers to it
any longer.

This commit also removes or updates some stale comments on locking
issues related to blk-cgroup operations.

Reported-by: Tomas Konir <tomas.konir@gmail.com>
Reported-by: Lee Tibbert <lee.tibbert@gmail.com>
Reported-by: Marco Piazza <mpiazza@gmail.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Tested-by: Tomas Konir <tomas.konir@gmail.com>
Tested-by: Lee Tibbert <lee.tibbert@gmail.com>
Tested-by: Marco Piazza <mpiazza@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Merge tag 'v4.12-rc3' into for-linus

Merge with mainline to get acpi_dev_present() needed by patches to
axp20x-pek driver.

Merge tag 'v4.12-rc3' into next

Sync with mainline to bring in changes in platform drovers dropping
calls to sparse_keymap_free() so that we can remove it for good.

Sync to mainline for security submaintainers to work against

Merge remote-tracking branch 'airlied/drm-next' into drm-misc-next

Picking up drm-next @ 4.12-rc1 in order to apply Michal Hocko's vmalloc patch set

Signed-off-by: Sean Paul <seanpaul@chromium.org>

Merge 'v4.12-rc1' into MTD

Bring a few queued patches in sync for -next development.

Merge tag 'v4.12-rc1' into patchwork

Linux 4.12-rc1

* tag 'v4.12-rc1': (13212 commits)
Linux 4.12-rc1
mm, docs: update memory.stat description with workingset* entries
mm: vmscan: scan until

Merge tag 'v4.12-rc1' into patchwork

Linux 4.12-rc1

* tag 'v4.12-rc1': (13212 commits)
Linux 4.12-rc1
mm, docs: update memory.stat description with workingset* entries
mm: vmscan: scan until it finds eligible pages
mm, thp: copying user pages must schedule on collapse
dax: fix PMD data corruption when fault races with write
dax: fix data corruption when fault races with write
ext4: return to starting transaction in ext4_dax_huge_fault()
mm: fix data corruption due to stale mmap reads
dax: prevent invalidation of mapped DAX entries
Tigran has moved
mm, vmalloc: fix vmalloc users tracking properly
mm/khugepaged: add missed tracepoint for collapse_huge_page_swapin
gcov: support GCC 7.1
mm, vmstat: Remove spurious WARN() during zoneinfo print
time: delete current_fs_time()
hwpoison, memcg: forcibly uncharge LRU pages
sound: Disable the build of OSS drivers
drm/i915: Make vblank evade warnings optional
Input: cros_ec_keyb - remove extraneous 'const'
drm/nouveau/therm: remove ineffective workarounds for alarm bugs
...

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Merge branch 'linus' into x86/urgent, to pick up dependent commits

We are going to fix a bug introduced by a more recent commit, so
refresh the tree.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

Merge branch 'for-4.12/block' of git://git.kernel.dk/linux-block

Pull block layer updates from Jens Axboe:

- Add BFQ IO scheduler under the new blk-mq scheduling framework. BFQ
was initially a

Merge branch 'for-4.12/block' of git://git.kernel.dk/linux-block

Pull block layer updates from Jens Axboe:

- Add BFQ IO scheduler under the new blk-mq scheduling framework. BFQ
was initially a fork of CFQ, but subsequently changed to implement
fairness based on B-WF2Q+, a modified variant of WF2Q. BFQ is meant
to be used on desktop type single drives, providing good fairness.
From Paolo.

- Add Kyber IO scheduler. This is a full multiqueue aware scheduler,
using a scalable token based algorithm that throttles IO based on
live completion IO stats, similary to blk-wbt. From Omar.

- A series from Jan, moving users to separately allocated backing
devices. This continues the work of separating backing device life
times, solving various problems with hot removal.

- A series of updates for lightnvm, mostly from Javier. Includes a
'pblk' target that exposes an open channel SSD as a physical block
device.

- A series of fixes and improvements for nbd from Josef.

- A series from Omar, removing queue sharing between devices on mostly
legacy drivers. This helps us clean up other bits, if we know that a
queue only has a single device backing. This has been overdue for
more than a decade.

- Fixes for the blk-stats, and improvements to unify the stats and user
windows. This both improves blk-wbt, and enables other users to
register a need to receive IO stats for a device. From Omar.

- blk-throttle improvements from Shaohua. This provides a scalable
framework for implementing scalable priotization - particularly for
blk-mq, but applicable to any type of block device. The interface is
marked experimental for now.

- Bucketized IO stats for IO polling from Stephen Bates. This improves
efficiency of polled workloads in the presence of mixed block size
IO.

- A few fixes for opal, from Scott.

- A few pulls for NVMe, including a lot of fixes for NVMe-over-fabrics.
From a variety of folks, mostly Sagi and James Smart.

- A series from Bart, improving our exposed info and capabilities from
the blk-mq debugfs support.

- A series from Christoph, cleaning up how handle WRITE_ZEROES.

- A series from Christoph, cleaning up the block layer handling of how
we track errors in a request. On top of being a nice cleanup, it also
shrinks the size of struct request a bit.

- Removal of mg_disk and hd (sorry Linus) by Christoph. The former was
never used by platforms, and the latter has outlived it's usefulness.

- Various little bug fixes and cleanups from a wide variety of folks.

* 'for-4.12/block' of git://git.kernel.dk/linux-block: (329 commits)
block: hide badblocks attribute by default
blk-mq: unify hctx delay_work and run_work
block: add kblock_mod_delayed_work_on()
blk-mq: unify hctx delayed_run_work and run_work
nbd: fix use after free on module unload
MAINTAINERS: bfq: Add Paolo as maintainer for the BFQ I/O scheduler
blk-mq-sched: alloate reserved tags out of normal pool
mtip32xx: use runtime tag to initialize command header
scsi: Implement blk_mq_ops.show_rq()
blk-mq: Add blk_mq_ops.show_rq()
blk-mq: Show operation, cmd_flags and rq_flags names
blk-mq: Make blk_flags_show() callers append a newline character
blk-mq: Move the "state" debugfs attribute one level down
blk-mq: Unregister debugfs attributes earlier
blk-mq: Only unregister hctxs for which registration succeeded
blk-mq-debugfs: Rename functions for registering and unregistering the mq directory
blk-mq: Let blk_mq_debugfs_register() look up the queue name
blk-mq: Register <dev>/queue/mq after having registered <dev>/queue
ide-pm: always pass 0 error to ide_complete_rq in ide_do_devset
ide-pm: always pass 0 error to __blk_end_request_all
..

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bfq: fix compile error if CONFIG_CGROUPS=n

If we don't have CGROUPS enabled, the compile ends in the
following misery:

In file included from ../block/bfq-iosched.c:105:0:
../block/bfq-iosched.h:819

bfq: fix compile error if CONFIG_CGROUPS=n

If we don't have CGROUPS enabled, the compile ends in the
following misery:

In file included from ../block/bfq-iosched.c:105:0:
../block/bfq-iosched.h:819:22: error: array type has incomplete element type
extern struct cftype bfq_blkcg_legacy_files[];
^
../block/bfq-iosched.h:820:22: error: array type has incomplete element type
extern struct cftype bfq_blkg_files[];
^

Move the declarations under the right ifdef.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jens Axboe <axboe@fb.com>

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block, bfq: split bfq-iosched.c into multiple source files

The BFQ I/O scheduler features an optimal fair-queuing
(proportional-share) scheduling algorithm, enriched with several
mechanisms to boost

block, bfq: split bfq-iosched.c into multiple source files

The BFQ I/O scheduler features an optimal fair-queuing
(proportional-share) scheduling algorithm, enriched with several
mechanisms to boost throughput and reduce latency for interactive and
real-time applications. This makes BFQ a large and complex piece of
code. This commit addresses this issue by splitting BFQ into three
main, independent components, and by moving each component into a
separate source file:
1. Main algorithm: handles the interaction with the kernel, and
decides which requests to dispatch; it uses the following two further
components to achieve its goals.
2. Scheduling engine (Hierarchical B-WF2Q+ scheduling algorithm):
computes the schedule, using weights and budgets provided by the above
component.
3. cgroups support: handles group operations (creation, destruction,
move, ...).

Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@fb.com>

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