Factor out cgroup_{apply|finalize}_control() so that control mask
update can be done in several simple steps. This patch doesn't
introduce behavior changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
While controllers are being enabled and disabled in
cgroup_subtree_control_write(), the original subsystem masks are
stashed in local variables so that they can be restored if the
operation fails in the middle.
This patch adds dedicated fields to struct cgroup to be used instead
of the local variables and implements functions to stash the current
values, propagate the changes and restore them recursively. Combined
with the previous changes, this makes subsystem management operations
fully recursive and modularlized. This will be used to expand cgroup
core functionalities.
While at it, remove now unused @css_enable and @css_disable from
cgroup_subtree_control_write().
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
The three factored out css management operations -
cgroup_drain_offline() and cgroup_apply_control_{disable|enable}() -
only depend on the current state of the target cgroups and idempotent
and thus can be easily made to operate on the subtree instead of the
immediate children.
This patch introduces the iterators which walk live subtree and
converts the three functions to operate on the subtree including self
instead of the children. While this leads to spurious walking and be
slightly more expensive, it will allow them to be used for wider scope
of operations.
Note that cgroup_drain_offline() now tests for whether a css is dying
before trying to drain it. This is to avoid trying to drain live
csses as there can be mix of live and dying csses in a subtree unlike
children of the same parent.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Factor out css enabling and showing into cgroup_apply_control_enable().
* Nest subsystem walk inside child walk. The child walk will later be
converted to subtree walk which is a bit more expensive.
* Instead of operating on the differential masks @css_enable, simply
enable or show csses according to the current cgroup_control() and
cgroup_ss_mask(). This leads to the same result and is simpler and
more robust.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Factor out css disabling and hiding into cgroup_apply_control_disable().
* Nest subsystem walk inside child walk. The child walk will later be
converted to subtree walk which is a bit more expensive.
* Instead of operating on the differential masks @css_enable and
@css_disable, simply disable or hide csses according to the current
cgroup_control() and cgroup_ss_mask(). This leads to the same
result and is simpler and more robust.
* This allows error handling path to share the same code.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Factor out async css offline draining into cgroup_drain_offline().
* Nest subsystem walk inside child walk. The child walk will later be
converted to subtree walk which is a bit more expensive.
* Relocate the draining above subsystem mask preparation, which
doesn't create any behavior differences but helps further
refactoring.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
When a controller is enabled and visible on a non-root cgroup is
determined by subtree_control and subtree_ss_mask of the parent
cgroup. For a root cgroup, by the type of the hierarchy and which
controllers are attached to it. Deciding the above on each usage is
fragile and unnecessarily complicates the users.
This patch introduces cgroup_control() and cgroup_ss_mask() which
calculate and return the [visibly] enabled subsyste mask for the
specified cgroup and conver the existing usages.
* cgroup_e_css() is restructured for simplicity.
* cgroup_calc_subtree_ss_mask() and cgroup_subtree_control_write() no
longer need to distinguish root and non-root cases.
* With cgroup_control(), cgroup_controllers_show() can now handle both
root and non-root cases. cgroup_root_controllers_show() is removed.
v2: cgroup_control() updated to yield the correct result on v1
hierarchies too. cgroup_subtree_control_write() converted.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
We're in the process of refactoring cgroup and css management paths to
separate them out to eventually allow cgroups which aren't visible
through cgroup fs. This patch factors out cgroup_create() out of
cgroup_mkdir(). cgroup_create() contains all internal object creation
and initialization. cgroup_mkdir() uses cgroup_create() to create the
internal cgroup and adds interface directory and file creation.
This patch doesn't cause any behavior differences.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Currently, operations to initialize internal objects and create
interface directory and files are intermixed in cgroup_mkdir(). We're
in the process of refactoring cgroup and css management paths to
separate them out to eventually allow cgroups which aren't visible
through cgroup fs.
This patch reorders operations inside cgroup_mkdir() so that interface
directory and file handling comes after internal object
initialization. This will enable further refactoring.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Currently, whether a css (cgroup_subsys_state) has its interface files
created is not tracked and assumed to change together with the owning
cgroup's lifecycle. cgroup directory and interface creation is being
separated out from internal object creation to help refactoring and
eventually allow cgroups which are not visible through cgroupfs.
This patch adds CSS_VISIBLE to track whether a css has its interface
files created and perform management operations only when necessary
which helps decoupling interface file handling from internal object
lifecycle. After this patch, all css interface file management
functions can be called regardless of the current state and will
achieve the expected result.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
Currently, interface files are created when a css is created depending
on whether @visible is set. This patch separates out the two into
separate steps to help code refactoring and eventually allow cgroups
which aren't visible through cgroup fs.
Move css_populate_dir() out of create_css() and drop @visible. While
at it, rename the function to css_create() for consistency.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
During task migration, tasks may transfer between two css_sets which
are associated with the same cgroup. If those tasks are the only
tasks in the cgroup, this currently triggers a spurious de-populated
event on the cgroup.
Fix it by bumping up populated count before bumping it down during
migration to ensure that it doesn't reach zero spuriously.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
css_sets are hashed by their subsys[] contents and in cgroup_init()
init_css_set is hashed early, before subsystem inits, when all entries
in its subsys[] are NULL, so that cgroup_dfl_root initialization can
find and link to it. As subsystems are initialized,
init_css_set.subsys[] is filled up but the hashing is never updated
making init_css_set hashed in the wrong place. While incorrect, this
doesn't cause a critical failure as css_set management code would
create an identical css_set dynamically.
Fix it by rehashing init_css_set after subsystems are initialized.
While at it, drop unnecessary @key local variable.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Zefan Li <lizefan@huawei.com>
An associated css can be around for quite a while after a cgroup
directory has been removed. In general, it makes sense to reset it to
defaults so as not to worry about any remnants. For instance, memory
cgroup needs to reset memory.low, otherwise pages charged to a dead
cgroup might never get reclaimed. There's ->css_reset callback, which
would fit perfectly for the purpose. Currently, it's only called when a
subsystem is disabled in the unified hierarchy and there are other
subsystems dependant on it. Let's call it on css destruction as well.
Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
There is a mistake about the print format name:id <--> %d:%s, which
the name is 'char *' type and id is 'int' type. Change "name:id" to
"id:name" instead to be consistent with "cgroup_subsys %d:%s".
Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
Acked-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
No internal process rule is enforced by cgroup_migrate_prepare_dst()
during process migration. It tests whether the target cgroup's
->child_subsys_mask is zero which is different from "subtree_control"
write path which tests ->subtree_control. This hasn't mattered
because up until now, both ->child_subsys_mask and ->subtree_control
are zero or non-zero at the same time. However, with the planned
addition of implicit controllers, this will no longer be true.
This patch prepares for the change by making
cgorup_migrate_prepare_dst() test ->subtree_control instead.
Signed-off-by: Tejun Heo <tj@kernel.org>
The function currently returns -EBADF for a directory on the default
hierarchy. Make it also recognize cgroup2_fs_type. This will be used
for perf_event cgroup2 support.
Signed-off-by: Tejun Heo <tj@kernel.org>
After the recent do_each_subsys_mask() conversion, there's no reason
to use ulong for subsystem masks. We'll be adding more subsystem
masks to persistent data structures, let's reduce its size to u16
which should be enough for now and the foreseeable future.
This doesn't create any noticeable behavior differences.
v2: Johannes spotted that the initial patch missed cgroup_no_v1_mask.
Converted.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
There are several places in cgroup_subtree_control_write() which can
use do_each_subsys_mask() instead of manual mask testing. Use it.
No functional changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
for_each_subsys_which() allows iterating subsystems specified in a
subsystem bitmask; unfortunately, it requires the mask to be an
unsigned long l-value which can be inconvenient and makes it awkward
to use a smaller type for subsystem masks.
This patch converts for_each_subsy_which() to do-while style which
allows it to drop the l-value requirement. The new iterator is named
do_each_subsys_mask() / while_each_subsys_mask().
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
This reverts commit 56c807ba4e.
cgroup_subsys->css_e_css_changed() was supposed to be used by cgroup
writeback support; however, the change to per-inode cgroup association
made it unnecessary and the callback doesn't have any user. Remove
it.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
cgroup_addrm_files() incorrectly returned 0 after add failure. Fix
it.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Add cgroup_no_v1= to kernel-parameters.txt, and a small blurb to
cgroup-v2.txt section about transitioning from cgroup to cgroup2.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Testing cgroup2 can be painful with system software automatically
mounting and populating all cgroup controllers in v1 mode. Sometimes
they can be unmounted from rc.local, sometimes even that is too late.
Provide a commandline option to disable certain controllers in v1
mounts, so that they remain available for cgroup2 mounts.
Example use:
cgroup_no_v1=memory,cpu
cgroup_no_v1=all
Disabling will be confirmed at boot-time as such:
[ 0.013770] Disabling cpu control group subsystem in v1 mounts
[ 0.016004] Disabling memory control group subsystem in v1 mounts
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
The file cgroup-debug.c had been removed from commit fe6934354f
(cgroups: move the cgroup debug subsys into cgroup.c to access internal state).
Remain the CFLAGS_REMOVE_cgroup-debug.o = $(CC_FLAGS_FTRACE)
useless in kernel/Makefile.
Signed-off-by: Li Bin <huawei.libin@huawei.com>
Acked-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This should have happened in 6255c46f (cgroup: rename cgroup
documentations, 2016-01-11).
Signed-off-by: W. Trevor King <wking@tremily.us>
Signed-off-by: Tejun Heo <tj@kernel.org>
There are three subsystem callbacks in css shutdown path -
css_offline(), css_released() and css_free(). Except for
css_released(), cgroup core didn't guarantee the order of invocation.
css_offline() or css_free() could be called on a parent css before its
children. This behavior is unexpected and led to bugs in cpu and
memory controller.
The previous patch updated ordering for css_offline() which fixes the
cpu controller issue. While there currently isn't a known bug caused
by misordering of css_free() invocations, let's fix it too for
consistency.
css_free() ordering can be trivially fixed by moving putting of the
parent css below css_free() invocation.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
There are three subsystem callbacks in css shutdown path -
css_offline(), css_released() and css_free(). Except for
css_released(), cgroup core didn't guarantee the order of invocation.
css_offline() or css_free() could be called on a parent css before its
children. This behavior is unexpected and led to bugs in cpu and
memory controller.
This patch updates offline path so that a parent css is never offlined
before its children. Each css keeps online_cnt which reaches zero iff
itself and all its children are offline and offline_css() is invoked
only after online_cnt reaches zero.
This fixes the memory controller bug and allows the fix for cpu
controller.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reported-by: Brian Christiansen <brian.o.christiansen@gmail.com>
Link: http://lkml.kernel.org/g/5698A023.9070703@de.ibm.com
Link: http://lkml.kernel.org/g/CAKB58ikDkzc8REt31WBkD99+hxNzjK4+FBmhkgS+NVrC9vjMSg@mail.gmail.com
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
If "cpuset.memory_migrate" is set, when a process is moved from one
cpuset to another with a different memory node mask, pages in used by
the process are migrated to the new set of nodes. This was performed
synchronously in the ->attach() callback, which is synchronized
against process management. Recently, the synchronization was changed
from per-process rwsem to global percpu rwsem for simplicity and
optimization.
Combined with the synchronous mm migration, this led to deadlocks
because mm migration could schedule a work item which may in turn try
to create a new worker blocking on the process management lock held
from cgroup process migration path.
This heavy an operation shouldn't be performed synchronously from that
deep inside cgroup migration in the first place. This patch punts the
actual migration to an ordered workqueue and updates cgroup process
migration and cpuset config update paths to flush the workqueue after
all locks are released. This way, the operations still seem
synchronous to userland without entangling mm migration with process
management synchronization. CPU hotplug can also invoke mm migration
but there's no reason for it to wait for mm migrations and thus
doesn't synchronize against their completions.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: stable@vger.kernel.org # v4.4+
Pull NVMe updates from Jens Axboe:
"Last branch for this series is the nvme changes. It's in a separate
branch to avoid splitting too much between core and NVMe changes,
since NVMe is still helping drive some blk-mq changes. That said, not
a huge amount of core changes in here. The grunt of the work is the
continued split of the code"
* 'for-4.5/nvme' of git://git.kernel.dk/linux-block: (67 commits)
uapi: update install list after nvme.h rename
NVMe: Export NVMe attributes to sysfs group
NVMe: Shutdown controller only for power-off
NVMe: IO queue deletion re-write
NVMe: Remove queue freezing on resets
NVMe: Use a retryable error code on reset
NVMe: Fix admin queue ring wrap
nvme: make SG_IO support optional
nvme: fixes for NVME_IOCTL_IO_CMD on the char device
nvme: synchronize access to ctrl->namespaces
nvme: Move nvme_freeze/unfreeze_queues to nvme core
PCI/AER: include header file
NVMe: Export namespace attributes to sysfs
NVMe: Add pci error handlers
block: remove REQ_NO_TIMEOUT flag
nvme: merge iod and cmd_info
nvme: meta_sg doesn't have to be an array
nvme: properly free resources for cancelled command
nvme: simplify completion handling
nvme: special case AEN requests
...
Pull lightnvm fixes and updates from Jens Axboe:
"This should have been part of the drivers branch, but it arrived a bit
late and wasn't based on the official core block driver branch. So
they got a small scolding, but got a pass since it's still new. Hence
it's in a separate branch.
This is mostly pure fixes, contained to lightnvm/, and minor feature
additions"
* 'for-4.5/lightnvm' of git://git.kernel.dk/linux-block: (26 commits)
lightnvm: ensure that nvm_dev_ops can be used without CONFIG_NVM
lightnvm: introduce factory reset
lightnvm: use system block for mm initialization
lightnvm: introduce ioctl to initialize device
lightnvm: core on-disk initialization
lightnvm: introduce mlc lower page table mappings
lightnvm: add mccap support
lightnvm: manage open and closed blocks separately
lightnvm: fix missing grown bad block type
lightnvm: reference rrpc lun in rrpc block
lightnvm: introduce nvm_submit_ppa
lightnvm: move rq->error to nvm_rq->error
lightnvm: support multiple ppas in nvm_erase_ppa
lightnvm: move the pages per block check out of the loop
lightnvm: sectors first in ppa list
lightnvm: fix locking and mempool in rrpc_lun_gc
lightnvm: put block back to gc list on its reclaim fail
lightnvm: check bi_error in gc
lightnvm: return the get_bb_tbl return value
lightnvm: refactor end_io functions for sync
...
Pull block driver updates from Jens Axboe:
"This is the block driver pull request for 4.5, with the exception of
NVMe, which is in a separate branch and will be posted after this one.
This pull request contains:
- A set of bcache stability fixes, which have been acked by Kent.
These have been used and tested for more than a year by the
community, so it's about time that they got in.
- A set of drbd updates from the drbd team (Andreas, Lars, Philipp)
and Markus Elfring, Oleg Drokin.
- A set of fixes for xen blkback/front from the usual suspects, (Bob,
Konrad) as well as community based fixes from Kiri, Julien, and
Peng.
- A 2038 time fix for sx8 from Shraddha, with a fix from me.
- A small mtip32xx cleanup from Zhu Yanjun.
- A null_blk division fix from Arnd"
* 'for-4.5/drivers' of git://git.kernel.dk/linux-block: (71 commits)
null_blk: use sector_div instead of do_div
mtip32xx: restrict variables visible in current code module
xen/blkfront: Fix crash if backend doesn't follow the right states.
xen/blkback: Fix two memory leaks.
xen/blkback: make st_ statistics per ring
xen/blkfront: Handle non-indirect grant with 64KB pages
xen-blkfront: Introduce blkif_ring_get_request
xen-blkback: clear PF_NOFREEZE for xen_blkif_schedule()
xen/blkback: Free resources if connect_ring failed.
xen/blocks: Return -EXX instead of -1
xen/blkback: make pool of persistent grants and free pages per-queue
xen/blkback: get the number of hardware queues/rings from blkfront
xen/blkback: pseudo support for multi hardware queues/rings
xen/blkback: separate ring information out of struct xen_blkif
xen/blkfront: correct setting for xen_blkif_max_ring_order
xen/blkfront: make persistent grants pool per-queue
xen/blkfront: Remove duplicate setting of ->xbdev.
xen/blkfront: Cleanup of comments, fix unaligned variables, and syntax errors.
xen/blkfront: negotiate number of queues/rings to be used with backend
xen/blkfront: split per device io_lock
...
Expose an interface to allow users to mark several accesses together as
being user space accesses, allowing batching of the surrounding user
space access markers (SMAP on x86, PAN on arm64, domain register
switching on arm).
This is currently only used for the user string lenth and copying
functions, where the SMAP overhead on x86 drowned the actual user
accesses (only noticeable on newer microarchitectures that support SMAP
in the first place, of course).
* user access batching branch:
Use the new batched user accesses in generic user string handling
Add 'unsafe' user access functions for batched accesses
x86: reorganize SMAP handling in user space accesses
Merge third patch-bomb from Andrew Morton:
"I'm pretty much done for -rc1 now:
- the rest of MM, basically
- lib/ updates
- checkpatch, epoll, hfs, fatfs, ptrace, coredump, exit
- cpu_mask simplifications
- kexec, rapidio, MAINTAINERS etc, etc.
- more dma-mapping cleanups/simplifications from hch"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (109 commits)
MAINTAINERS: add/fix git URLs for various subsystems
mm: memcontrol: add "sock" to cgroup2 memory.stat
mm: memcontrol: basic memory statistics in cgroup2 memory controller
mm: memcontrol: do not uncharge old page in page cache replacement
Documentation: cgroup: add memory.swap.{current,max} description
mm: free swap cache aggressively if memcg swap is full
mm: vmscan: do not scan anon pages if memcg swap limit is hit
swap.h: move memcg related stuff to the end of the file
mm: memcontrol: replace mem_cgroup_lruvec_online with mem_cgroup_online
mm: vmscan: pass memcg to get_scan_count()
mm: memcontrol: charge swap to cgroup2
mm: memcontrol: clean up alloc, online, offline, free functions
mm: memcontrol: flatten struct cg_proto
mm: memcontrol: rein in the CONFIG space madness
net: drop tcp_memcontrol.c
mm: memcontrol: introduce CONFIG_MEMCG_LEGACY_KMEM
mm: memcontrol: allow to disable kmem accounting for cgroup2
mm: memcontrol: account "kmem" consumers in cgroup2 memory controller
mm: memcontrol: move kmem accounting code to CONFIG_MEMCG
mm: memcontrol: separate kmem code from legacy tcp accounting code
...
Pull overlayfs updates from Miklos Szeredi:
"This contains several bug fixes and a new mount option
'default_permissions' that allows read-only exported NFS
filesystems to be used as lower layer"
* 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
ovl: check dentry positiveness in ovl_cleanup_whiteouts()
ovl: setattr: check permissions before copy-up
ovl: root: copy attr
ovl: move super block magic number to magic.h
ovl: use a minimal buffer in ovl_copy_xattr
ovl: allow zero size xattr
ovl: default permissions
Pull fuse updates from Miklos Szeredi:
"This adds SEEK_HOLE and SEEK_DATA support in lseek"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
fuse: add support for SEEK_HOLE and SEEK_DATA in lseek
This set of changes contains a new driver for OMAP (using the dual-mode
timers) as well as an assortment of fixes all across the board.
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Merge tag 'pwm/for-4.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
Pull pwm updates from Thierry Reding:
"This set of changes contains a new driver for OMAP (using the
dual-mode timers) as well as an assortment of fixes all across the
board"
* tag 'pwm/for-4.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
pwm: Mark all devices as "might sleep"
pwm: omap-dmtimer: Potential NULL dereference on error
pwm: add HAS_IOMEM dependency to PWM_FSL_FTM
pwm: Add PWM driver for OMAP using dual-mode timers
pwm: rcar: Improve accuracy of frequency division setting
pwm: lpc32xx: return ERANGE, if requested period is not supported
pwm: lpc32xx: fix and simplify duty cycle and period calculations
pwm: lpc32xx: make device usable with common clock framework
pwm: lpc32xx: correct number of PWM channels from 2 to 1
dt: lpc32xx: pwm: update documentation of LPC32xx PWM device
dt: lpc32xx: pwm: correct LPC32xx PWM device node example
pwm: fsl-ftm: Fix clock enable/disable when using PM
pwm: lpss: Rework the sequence of programming PWM_SW_UPDATE
pwm: lpss: Select core part automatically
pwm: lpss: Update PWM setting for Broxton
pwm: bcm2835: Fix email address specification
pwm: bcm2835: Prevent division by zero
pwm: bcm2835: Calculate scaler in ->config()
pwm: lpss: Remove ->free() callback
Commit d1cd214277 ("pwm: Set enable state properly on failed call to
enable") introduced a mutex that is needed to protect internal state of
PWM devices. Since that mutex is acquired in pwm_set_polarity() and in
pwm_enable() and might potentially block, all PWM devices effectively
become "might sleep".
It's rather pointless to keep the .can_sleep field around, but given
that there are external users let's postpone the removal for the next
release cycle.
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
- Modify the driver core and the USB subsystem to allow USB devices
to stay suspended over system suspend/resume cycles if they have
been runtime-suspended already beforehand and fix some bugs on
top of these changes (Tomeu Vizoso, Rafael Wysocki).
- Update ACPICA to upstream revision 20160108, including updates
of the ACPICA's copyright notices, a code fixup resulting from
a regression fix that was necessary in the upstream code only
(the regression fixed by it has never been present in Linux)
and a compiler warning fix (Bob Moore, Lv Zheng).
- Fix a recent regression in the cpuidle menu governor that broke
it on practically all architectures other than x86 and make a
couple of optimizations on top of that fix (Rafael Wysocki).
- Clean up the selection of cpuidle governors depending on whether
or not the kernel is configured for tickless systems (Jean Delvare).
- Revert a recent commit that introduced a regression in the ACPI
backlight driver, address the problem it attempted to fix in a
different way and revert one more cosmetic change depending on
the problematic commit (Hans de Goede).
- Add two more ACPI backlight quirks (Hans de Goede).
- Fix a few minor problems in the core devfreq code, clean it up
a bit and update the MAINTAINERS information related to it
(Chanwoo Choi, MyungJoo Ham).
- Improve an error message in the ACPI fan driver (Andy Lutomirski).
- Fix a recent build regression in the cpupower tool (Shreyas Prabhu).
/
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Merge tag 'pm+acpi-4.5-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more power management and ACPI updates from Rafael Wysocki:
"This includes fixes on top of the previous batch of PM+ACPI updates
and some new material as well.
From the new material perspective the most significant are the driver
core changes that should allow USB devices to stay suspended over
system suspend/resume cycles if they have been runtime-suspended
already beforehand. Apart from that, ACPICA is updated to upstream
revision 20160108 (cosmetic mostly, but including one fixup on top of
the previous ACPICA update) and there are some devfreq updates the
didn't make it before (due to timing).
A few recent regressions are fixed, most importantly in the cpuidle
menu governor and in the ACPI backlight driver and some x86 platform
drivers depending on it.
Some more bugs are fixed and cleanups are made on top of that.
Specifics:
- Modify the driver core and the USB subsystem to allow USB devices
to stay suspended over system suspend/resume cycles if they have
been runtime-suspended already beforehand and fix some bugs on top
of these changes (Tomeu Vizoso, Rafael Wysocki).
- Update ACPICA to upstream revision 20160108, including updates of
the ACPICA's copyright notices, a code fixup resulting from a
regression fix that was necessary in the upstream code only (the
regression fixed by it has never been present in Linux) and a
compiler warning fix (Bob Moore, Lv Zheng).
- Fix a recent regression in the cpuidle menu governor that broke it
on practically all architectures other than x86 and make a couple
of optimizations on top of that fix (Rafael Wysocki).
- Clean up the selection of cpuidle governors depending on whether or
not the kernel is configured for tickless systems (Jean Delvare).
- Revert a recent commit that introduced a regression in the ACPI
backlight driver, address the problem it attempted to fix in a
different way and revert one more cosmetic change depending on the
problematic commit (Hans de Goede).
- Add two more ACPI backlight quirks (Hans de Goede).
- Fix a few minor problems in the core devfreq code, clean it up a
bit and update the MAINTAINERS information related to it (Chanwoo
Choi, MyungJoo Ham).
- Improve an error message in the ACPI fan driver (Andy Lutomirski).
- Fix a recent build regression in the cpupower tool (Shreyas
Prabhu)"
* tag 'pm+acpi-4.5-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits)
cpuidle: menu: Avoid pointless checks in menu_select()
sched / idle: Drop default_idle_call() fallback from call_cpuidle()
cpupower: Fix build error in cpufreq-info
cpuidle: Don't enable all governors by default
cpuidle: Default to ladder governor on ticking systems
time: nohz: Expose tick_nohz_enabled
ACPICA: Update version to 20160108
ACPICA: Silence a -Wbad-function-cast warning when acpi_uintptr_t is 'uintptr_t'
ACPICA: Additional 2016 copyright changes
ACPICA: Reduce regression fix divergence from upstream ACPICA
ACPI / video: Add disable_backlight_sysfs_if quirk for the Toshiba Satellite R830
ACPI / video: Revert "thinkpad_acpi: Use acpi_video_handles_brightness_key_presses()"
ACPI / video: Document acpi_video_handles_brightness_key_presses() a bit
ACPI / video: Fix using an uninitialized mutex / list_head in acpi_video_handles_brightness_key_presses()
ACPI / video: Revert "ACPI / video: driver must be registered before checking for keypresses"
ACPI / fan: Improve acpi_device_update_power error message
ACPI / video: Add disable_backlight_sysfs_if quirk for the Toshiba Portege R700
cpuidle: menu: Fix menu_select() for CPUIDLE_DRIVER_STATE_START == 0
MAINTAINERS: Add devfreq-event entry
MAINTAINERS: Add missing git repository and directory for devfreq
...
Clean up the clock API on legacy SH to make it more similar to the Common
Clock Framework. This will avoid different behaviour in drivers shared
between legacy and CCF-based platforms (e.g. SCIF).
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Merge tag 'renesas-sh-drivers-for-v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas
Pull SH driver updates from Simon Horman:
"Clean up the clock API on legacy SH to make it more similar to the
Common Clock Framework. This will avoid different behaviour in
drivers shared between legacy and CCF-based platforms (e.g. SCIF)"
* tag 'renesas-sh-drivers-for-v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
drivers: sh: clk: Avoid crashes when passing NULL clocks
drivers: sh: clk: Remove obsolete and unused clk_round_parent()
Driver updates for ARM SoCs. Some for SoC-family code under drivers/soc,
but also some other driver updates that don't belong anywhere else. We also
bring in the drivers/reset code through arm-soc.
Some of the larger updates:
- Qualcomm support for SMEM, SMSM, SMP2P. All used to communicate with other
parts of the chip/board on these platforms, all proprietary protocols that
don't fit into other subsystems and live in drivers/soc for now.
- System bus driver for UniPhier
- Driver for the TI Wakeup M3 IPC device
- Power management for Raspberry PI
+ Again a bunch of other smaller updates and patches.
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Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC driver updates from Olof Johansson:
"Driver updates for ARM SoCs. Some for SoC-family code under
drivers/soc, but also some other driver updates that don't belong
anywhere else. We also bring in the drivers/reset code through
arm-soc.
Some of the larger updates:
- Qualcomm support for SMEM, SMSM, SMP2P. All used to communicate
with other parts of the chip/board on these platforms, all
proprietary protocols that don't fit into other subsystems and live
in drivers/soc for now.
- System bus driver for UniPhier
- Driver for the TI Wakeup M3 IPC device
- Power management for Raspberry PI
+ Again a bunch of other smaller updates and patches"
* tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (38 commits)
bus: uniphier: allow only built-in driver
ARM: bcm2835: clarify RASPBERRYPI_FIRMWARE dependency
MAINTAINERS: Drop Kumar Gala from QCOM
bus: uniphier-system-bus: add UniPhier System Bus driver
ARM: bcm2835: add rpi power domain driver
dt-bindings: add rpi power domain driver bindings
ARM: bcm2835: Define two new packets from the latest firmware.
drivers/soc: make mediatek/mtk-scpsys.c explicitly non-modular
soc: mediatek: SCPSYS: Add regulator support
MAINTAINERS: Change QCOM entries
soc: qcom: smd-rpm: Add existing platform support
memory/tegra: Add number of TLB lines for Tegra124
reset: hi6220: fix modular build
soc: qcom: Introduce WCNSS_CTRL SMD client
ARM: qcom: select ARM_CPU_SUSPEND for power management
MAINTAINERS: Add rules for Qualcomm dts files
soc: qcom: enable smsm/smp2p modular build
serial: msm_serial: Make config tristate
soc: qcom: smp2p: Qualcomm Shared Memory Point to Point
soc: qcom: smsm: Add driver for Qualcomm SMSM
...
As mentioned earlier, we usually bake this into the general "arm64" branch,
but this release we have partitioned up the updates a bit more.
Most of these updates are enabling new SoCs in the single defconfig for 64-bit,
Renesas R8A7795, a number of Tegra options, Socionext Uniphier and a handful
of new options for other platforms as well.
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Merge tag 'armsoc-defconfig64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM 64-bit defconfig updates from Olof Johansson:
"As mentioned earlier, we usually bake this into the general "arm64"
branch, but this release we have partitioned up the updates a bit
more.
Most of these updates are enabling new SoCs in the single defconfig
for 64-bit, Renesas R8A7795, a number of Tegra options, Socionext
Uniphier and a handful of new options for other platforms as well"
* tag 'armsoc-defconfig64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
arm64: mediatek: enable MTK_TIMER
arm64: defconfig: add CS2000 support
arm64: defconfig: Add Renesas R-Car SATA driver for R-Car Gen3 SoCs
arm64: defconfig: enable UniPhier SoCs support
arm64: add Kconfig entry for Socionext UniPhier SoC family
arm64: defconfig: add Renesas sound and AK4613 support
arm64: defconfig: add Renesas R-Car DMAC driver support
arm64: defconfig: Enable Renesas R-Car I2C Controller
arm64: defconfig: enable EthernetAVB
arm64: defconfig: Enable GPIO of Renesas R-Car Gen3 SoC
arm64: berlin: add the pinctrl dependency for Marvell Berlin SoCs
arm64: defconfig: renesas: Enable Renesas r8a7795 SoC
arm64: defconfig: Enable printk timestamps
arm64: defconfig: Enable squashfs support
arm64: defconfig: Enable sdhci-tegra driver
arm64: defconfig: Enable serial-tegra driver
arm64: defconfig: Enable tegra-apbdma driver
arm64: defconfig: Do not disable Tegra AHB driver
arm64: defconfig: Enable Tegra210 support
As usual, a bunch of commits, mostly adding drivers and other options to
defconfigs because it makes sense to have them enabled on various development
or product boards. Too much to enumerate each here.
There's an introduction of a pxa_defconfig, since PXA finally will allow
building a shared kernel for all boards. With this, we can hopefully
remove a bunch of individual defconfigs down the road but it requires
a bit of real life testing and transition period.
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Merge tag 'armsoc-defconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC defconfig updates from Olof Johansson:
"As usual, a bunch of commits, mostly adding drivers and other options
to defconfigs because it makes sense to have them enabled on various
development or product boards. Too much to enumerate each here.
There's an introduction of a pxa_defconfig, since PXA finally will
allow building a shared kernel for all boards. With this, we can
hopefully remove a bunch of individual defconfigs down the road but it
requires a bit of real life testing and transition period"
* tag 'armsoc-defconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (65 commits)
ARM: Add CONFIG_DEPRECATED_PARAM_STRUCT to netwinder_defconfig
ARM: multi_v7_defconfig: Add rockchip audio support
arm: multi_v7_defconfig: Add virtio drivers
ARM: zx_defconfig: remove CONFIG_MMC_DW_IDMAC
ARM: versatile: enable the right LEDs
ARM: pxa: add defconfig covering all the boards
ARM: versatile: select some defaults in defconfig
ARM: multi_v7_defconfig: Enable fan, sensors and audio for Odroid XU3
ARM: bcm2835: enable auxiliary spi driver in defconfig
ARM: bcm2835: enable all bcm2835-relevant in defconfig
ARM: default to multi_v7_defconfig
ARM: multi_v7_defconfig: enable rk808 clkout module
ARM: multi_v7_defconfig: enable rockchip crypto module
ARM: multi_v7_defconfig: enable Rockchip io-domain driver
ARM: multi_v7_defconfig: Enable generic SoC internal OMAP regulators
ARM: multi_v7_defconfig: Enable AM437x PMIC TPS65218
ARM: multi_v7_defconfig: enable TPS65217 regulator
ARM: realview: select apropriate targets
ARM: defconfig: qcom: Enable SSBI drivers
ARM: defconfig: Update qcom_defconfig
...
This is the first release where we split up the 64-bit contributions a
bit more, and in particular we are having a separate DT branch for them.
Contents:
- New devices added to Broadcom NorthStar2
- Misc fixes for Exynos7 boards
- QCOM updates for MSM8916
- Rockchip tweaks for rk3368 SoC and eval board
- A series of fixes for APM X-Gene v1 and v2
- Renesas R8A7795 CPU/PSCI additions
- Marvell Berlin4CT PSCI, cpuidle, watchdog portions
- Freescale LS1043a SoC and dev board support
+ some treewide or other misc changes
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Merge tag 'armsoc-dt64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM 64-bit DT updates from Olof Johansson:
"This is the first release where we split up the 64-bit contributions a
bit more, and in particular we are having a separate DT branch for
them.
Contents:
- New devices added to Broadcom NorthStar2
- Misc fixes for Exynos7 boards
- QCOM updates for MSM8916
- Rockchip tweaks for rk3368 SoC and eval board
- A series of fixes for APM X-Gene v1 and v2
- Renesas R8A7795 CPU/PSCI additions
- Marvell Berlin4CT PSCI, cpuidle, watchdog portions
- Freescale LS1043a SoC and dev board support
+ some treewide or other misc changes"
* tag 'armsoc-dt64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (104 commits)
dts/ls2080a: Update DTSI to add support of SP805 WDT
Documentation: DT: Add entry for ARM SP805-WDT
arm64: dts: X-Gene v2: I2C1 clock is always on
arm64: dts: X-Gene v1: I2C0 clock is always on
arm64: dts: Fix to use standard DT node names for X-Gene 1 and X-Gene 2 platforms
arm64: dts: hikey: add label properties to UARTs
arm64: dts: apq8016-sbc: add label properties for UART, I2C, and SPI
arm64: dts: apq8016-sbc: enable UART0 on LS connector
arm64: dts: juno: Add idle-states to device tree
arm64: dts: Added syscon-reboot node for FSL's LS2080A SoC
arm64: dts: add LS1043a-RDB board support
arm64: dts: add Freescale LS1043a SoC support
Documentation: DT: Add entry for Freescale LS1043a-RDB board
arm64: dts: uniphier: add PH1-LD10 SoC/board support
arm64: renesas: r8a7795: fix SATA clock assignment
arm64: dts: salvator-x: Enable SATA controller
arm64: dts: r8a7795: Add SATA controller node
arm64: renesas: r8a7795: add internal delay for i2c IPs
arm64: renesas: salvator-x: Add board part number to DT bindings
arm64: dts: r8a7795: Add pmu device nodes
...
