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2012-11-29Merge branch 'pm-cpuidle'Rafael J. Wysocki
* pm-cpuidle: cpuidle: Measure idle state durations with monotonic clock cpuidle: fix a suspicious RCU usage in menu governor cpuidle: support multiple drivers cpuidle: prepare the cpuidle core to handle multiple drivers cpuidle: move driver checking within the lock section cpuidle: move driver's refcount to cpuidle cpuidle: fixup device.h header in cpuidle.h cpuidle / sysfs: move structure declaration into the sysfs.c file cpuidle: Get typical recent sleep interval cpuidle: Set residency to 0 if target Cstate not enter cpuidle: Quickly notice prediction failure in general case cpuidle: Quickly notice prediction failure for repeat mode cpuidle / sysfs: move kobj initialization in the syfs file cpuidle / sysfs: change function parameter
2012-11-29Merge branch 'acpi-general'Rafael J. Wysocki
* acpi-general: (38 commits) ACPI / thermal: _TMP and _CRT/_HOT/_PSV/_ACx dependency fix ACPI: drop unnecessary local variable from acpi_system_write_wakeup_device() ACPI: Fix logging when no pci_irq is allocated ACPI: Update Dock hotplug error messages ACPI: Update Container hotplug error messages ACPI: Update Memory hotplug error messages ACPI: Update CPU hotplug error messages ACPI: Add acpi_handle_<level>() interfaces ACPI: remove use of __devexit ACPI / PM: Add Sony Vaio VPCEB1S1E to nonvs blacklist. ACPI / battery: Correct battery capacity values on Thinkpads Revert "ACPI / x86: Add quirk for "CheckPoint P-20-00" to not use bridge _CRS_ info" ACPI: create _SUN sysfs file ACPI / memhotplug: bind the memory device when the driver is being loaded ACPI / memhotplug: don't allow to eject the memory device if it is being used ACPI / memhotplug: free memory device if acpi_memory_enable_device() failed ACPI / memhotplug: fix memory leak when memory device is unbound from acpi_memhotplug ACPI / memhotplug: deal with eject request in hotplug queue ACPI / memory-hotplug: add memory offline code to acpi_memory_device_remove() ACPI / memory-hotplug: call acpi_bus_trim() to remove memory device ... Conflicts: include/linux/acpi.h (two additions at the end of the same file)
2012-11-29Merge branch 'pm-qos'Rafael J. Wysocki
* pm-qos: PM / QoS: Handle device PM QoS flags while removing constraints PM / QoS: Resume device before exposing/hiding PM QoS flags PM / QoS: Document request manipulation requirement for flags PM / QoS: Fix a free error in the dev_pm_qos_constraints_destroy() PM / QoS: Fix the return value of dev_pm_qos_update_request() PM / ACPI: Take device PM QoS flags into account PM / Domains: Check device PM QoS flags in pm_genpd_poweroff() PM / QoS: Make it possible to expose PM QoS device flags to user space PM / QoS: Introduce PM QoS device flags support PM / QoS: Prepare struct dev_pm_qos_request for more request types PM / QoS: Introduce request and constraint data types for PM QoS flags PM / QoS: Prepare device structure for adding more constraint types
2012-11-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-29do_coredump(): get rid of pt_regs argumentAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-29print_fatal_signal(): get rid of pt_regs argumentAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-29ptrace_signal(): get rid of unused argumentsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-29get rid of ptrace_signal_deliver() argumentsAl Viro
the first one is equal to signal_pt_regs(), the second is never used (and always NULL, while we are at it). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-29flagday: kill pt_regs argument of do_fork()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28death to idle_regs()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28don't pass regs to copy_process()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28flagday: don't pass regs to copy_thread()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28audit: no nested contexts anymore...Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28generic sys_fork / sys_vfork / sys_cloneAl Viro
... and get rid of idiotic struct pt_regs * in asm-generic/syscalls.h prototypes of the same, while we are at it. Eventually we want those in linux/syscalls.h, of course, but that'll have to wait a bit. Note that there are *three* variants of sys_clone() order of arguments. Braindamage galore... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28kill daemonize()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-11-28cgroup: list_del_init() on removed eventsGreg Thelen
Use list_del_init() rather than list_del() to remove events from cgrp->event_list. No functional change. This is just defensive coding. Signed-off-by: Greg Thelen <gthelen@google.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2012-11-28cgroup: fix lockdep warning for event_controlGreg Thelen
The cgroup_event_wake() function is called with the wait queue head locked and it takes cgrp->event_list_lock. However, in cgroup_rmdir() remove_wait_queue() was being called after taking cgrp->event_list_lock. Correct the lock ordering by using a temporary list to obtain the event list to remove from the wait queue. Signed-off-by: Greg Thelen <gthelen@google.com> Signed-off-by: Aaron Durbin <adurbin@google.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2012-11-28kernel/ksysfs.c: remove CONFIG_HOTPLUG ifdefsBill Pemberton
Remove conditional code based on CONFIG_HOTPLUG being false. It's always on now in preparation of it going away as an option. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-28sysctl: remove CONFIG_HOTPLUG ifdefsBill Pemberton
Remove conditional code based on CONFIG_HOTPLUG being false. It's always on now in preparation of it going away as an option. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-28cputime: Comment cputime's adjusting codeFrederic Weisbecker
The reason for the scaling and monotonicity correction performed by cputime_adjust() may not be immediately clear to the reviewer. Add some comments to explain what happens there. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
2012-11-28cputime: Consolidate cputime adjustment codeFrederic Weisbecker
task_cputime_adjusted() and thread_group_cputime_adjusted() essentially share the same code. They just don't use the same source: * The first function uses the cputime in the task struct and the previous adjusted snapshot that ensures monotonicity. * The second adds the cputime of all tasks in the group and the previous adjusted snapshot of the whole group from the signal structure. Just consolidate the common code that does the adjustment. These functions just need to fetch the values from the appropriate source. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
2012-11-28cputime: Rename thread_group_times to thread_group_cputime_adjustedFrederic Weisbecker
We have thread_group_cputime() and thread_group_times(). The naming doesn't provide enough information about the difference between these two APIs. To lower the confusion, rename thread_group_times() to thread_group_cputime_adjusted(). This name better suggests that it's a version of thread_group_cputime() that does some stabilization on the raw cputime values. ie here: scale on top of CFS runtime stats and bound lower value for monotonicity. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
2012-11-28cputime: Move thread_group_cputime() to sched codeFrederic Weisbecker
thread_group_cputime() is a general cputime API that is not only used by posix cpu timer. Let's move this helper to sched code. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
2012-11-28cgroup: move list add after list head initilizationLi Zhong
2243076ad1 ("cgroup: initialize cgrp->allcg_node in init_cgroup_housekeeping()") initializes cgrp->allcg_node in init_cgroup_housekeeping(). Then in init_cgroup_root(), we should call init_cgroup_housekeeping() before adding it to &root->allcg_list; otherwise, we are initializing an entry already in a list. Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2012-11-27time: export time information for KVM pvclockMarcelo Tosatti
As suggested by John, export time data similarly to how its done by vsyscall support. This allows KVM to retrieve necessary information to implement vsyscall support in KVM guests. Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-11-27sched: add notifier for cross-cpu migrationsMarcelo Tosatti
Originally from Jeremy Fitzhardinge. Acked-by: Ingo Molnar <mingo@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-11-26futex: avoid wake_futex() for a PI futex_qDarren Hart
Dave Jones reported a bug with futex_lock_pi() that his trinity test exposed. Sometime between queue_me() and taking the q.lock_ptr, the lock_ptr became NULL, resulting in a crash. While futex_wake() is careful to not call wake_futex() on futex_q's with a pi_state or an rt_waiter (which are either waiting for a futex_unlock_pi() or a PI futex_requeue()), futex_wake_op() and futex_requeue() do not perform the same test. Update futex_wake_op() and futex_requeue() to test for q.pi_state and q.rt_waiter and abort with -EINVAL if detected. To ensure any future breakage is caught, add a WARN() to wake_futex() if the same condition is true. This fix has seen 3 hours of testing with "trinity -c futex" on an x86_64 VM with 4 CPUS. [akpm@linux-foundation.org: tidy up the WARN()] Signed-off-by: Darren Hart <dvhart@linux.intel.com> Reported-by: Dave Jones <davej@redat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: John Kacur <jkacur@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-11-26watchdog: using u64 in get_sample_period()Chuansheng Liu
In get_sample_period(), unsigned long is not enough: watchdog_thresh * 2 * (NSEC_PER_SEC / 5) case1: watchdog_thresh is 10 by default, the sample value will be: 0xEE6B2800 case2: set watchdog_thresh is 20, the sample value will be: 0x1 DCD6 5000 In case2, we need use u64 to express the sample period. Otherwise, changing the threshold thru proc often can not be successful. Signed-off-by: liu chuansheng <chuansheng.liu@intel.com> Acked-by: Don Zickus <dzickus@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-11-21Merge branch 'fortglx/3.8/time' of git://git.linaro.org/people/jstultz/linux ↵Thomas Gleixner
into timers/core Fix trivial conflicts in: kernel/time/tick-sched.c Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2012-11-20cgroup: remove obsolete guarantee from cgroup_task_migrate.Tao Ma
'guarantee' is already removed from cgroup_task_migrate, so remove the corresponding comments. Some other typos in cgroup are also changed. Cc: Tejun Heo <tj@kernel.org> Cc: Li Zefan <lizefan@huawei.com> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: Tejun Heo <tj@kernel.org>
2012-11-20proc: Usable inode numbers for the namespace file descriptors.Eric W. Biederman
Assign a unique proc inode to each namespace, and use that inode number to ensure we only allocate at most one proc inode for every namespace in proc. A single proc inode per namespace allows userspace to test to see if two processes are in the same namespace. This has been a long requested feature and only blocked because a naive implementation would put the id in a global space and would ultimately require having a namespace for the names of namespaces, making migration and certain virtualization tricks impossible. We still don't have per superblock inode numbers for proc, which appears necessary for application unaware checkpoint/restart and migrations (if the application is using namespace file descriptors) but that is now allowd by the design if it becomes important. I have preallocated the ipc and uts initial proc inode numbers so their structures can be statically initialized. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-11-20userns: For /proc/self/{uid,gid}_map derive the lower userns from the struct ↵Eric W. Biederman
file To keep things sane in the context of file descriptor passing derive the user namespace that uids are mapped into from the opener of the file instead of from current. When writing to the maps file the lower user namespace must always be the parent user namespace, or setting the mapping simply does not make sense. Enforce that the opener of the file was in the parent user namespace or the user namespace whose mapping is being set. Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-20userns: Implement unshare of the user namespaceEric W. Biederman
- Add CLONE_THREAD to the unshare flags if CLONE_NEWUSER is selected As changing user namespaces is only valid if all there is only a single thread. - Restore the code to add CLONE_VM if CLONE_THREAD is selected and the code to addCLONE_SIGHAND if CLONE_VM is selected. Making the constraints in the code clear. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-20userns: Implent proc namespace operationsEric W. Biederman
This allows entering a user namespace, and the ability to store a reference to a user namespace with a bind mount. Addition of missing userns_ns_put in userns_install from Gao feng <gaofeng@cn.fujitsu.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-20userns: Kill task_user_nsEric W. Biederman
The task_user_ns function hides the fact that it is getting the user namespace from struct cred on the task. struct cred may go away as soon as the rcu lock is released. This leads to a race where we can dereference a stale user namespace pointer. To make it obvious a struct cred is involved kill task_user_ns. To kill the race modify the users of task_user_ns to only reference the user namespace while the rcu lock is held. Cc: Kees Cook <keescook@chromium.org> Cc: James Morris <james.l.morris@oracle.com> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-20userns: Make create_new_namespaces take a user_ns parameterEric W. Biederman
Modify create_new_namespaces to explicitly take a user namespace parameter, instead of implicitly through the task_struct. This allows an implementation of unshare(CLONE_NEWUSER) where the new user namespace is not stored onto the current task_struct until after all of the namespaces are created. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-20userns: Allow unprivileged use of setns.Eric W. Biederman
- Push the permission check from the core setns syscall into the setns install methods where the user namespace of the target namespace can be determined, and used in a ns_capable call. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-20userns: Allow unprivileged users to create new namespacesEric W. Biederman
If an unprivileged user has the appropriate capabilities in their current user namespace allow the creation of new namespaces. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-20userns: Allow setting a userns mapping to your current uid.Eric W. Biederman
Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2012-11-19tracing: Remove unnecessary WARN_ONCE's from tracing_buffers_splice_readDave Jones
WARN shouldn't be used as a means of communicating failure to a userspace programmer. Link: http://lkml.kernel.org/r/20120725153908.GA25203@redhat.com Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2012-11-19tracing: Remove unneeded checks from the stack tracerAnton Vorontsov
It seems that 'ftrace_enabled' flag should not be used inside the tracer functions. The ftrace core is using this flag for internal purposes, and the flag wasn't meant to be used in tracers' runtime checks. stack tracer is the only tracer that abusing the flag. So stop it from serving as a bad example. Also, there is a local 'stack_trace_disabled' flag in the stack tracer, which is never updated; so it can be removed as well. Link: http://lkml.kernel.org/r/1342637761-9655-1-git-send-email-anton.vorontsov@linaro.org Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2012-11-19cgroup: add cgroup->idTejun Heo
With the introduction of generic cgroup hierarchy iterators, css_id is being phased out. It was unnecessarily complex, id'ing the wrong thing (cgroups need IDs, not CSSes) and has other oddities like not being available at ->css_alloc(). This patch adds cgroup->id, which is a simple per-hierarchy ida-allocated ID which is assigned before ->css_alloc() and released after ->css_free(). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com> Acked-by: Neil Horman <nhorman@tuxdriver.com>
2012-11-19cgroup, cpuset: remove cgroup_subsys->post_clone()Tejun Heo
Currently CGRP_CPUSET_CLONE_CHILDREN triggers ->post_clone(). Now that clone_children is cpuset specific, there's no reason to have this rather odd option activation mechanism in cgroup core. cpuset can check the flag from its ->css_allocate() and take the necessary action. Move cpuset_post_clone() logic to the end of cpuset_css_alloc() and remove cgroup_subsys->post_clone(). Loosely based on Glauber's "generalize post_clone into post_create" patch. Signed-off-by: Tejun Heo <tj@kernel.org> Original-patch-by: Glauber Costa <glommer@parallels.com> Original-patch: <1351686554-22592-2-git-send-email-glommer@parallels.com> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Glauber Costa <glommer@parallels.com>
2012-11-19cgroup: s/CGRP_CLONE_CHILDREN/CGRP_CPUSET_CLONE_CHILDREN/Tejun Heo
clone_children is only meaningful for cpuset and will stay that way. Rename the flag to reflect that and update documentation. Also, drop clone_children() wrapper in cgroup.c. The thin wrapper is used only a few times and one of them will go away soon. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Glauber Costa <glommer@parallels.com>
2012-11-19cgroup: rename ->create/post_create/pre_destroy/destroy() to ↵Tejun Heo
->css_alloc/online/offline/free() Rename cgroup_subsys css lifetime related callbacks to better describe what their roles are. Also, update documentation. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
2012-11-19cgroup: allow ->post_create() to failTejun Heo
There could be cases where controllers want to do initialization operations which may fail from ->post_create(). This patch makes ->post_create() return -errno to indicate failure and online_css() relay such failures. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Glauber Costa <glommer@parallels.com>
2012-11-19cgroup: update cgroup_create() failure pathTejun Heo
cgroup_create() was ignoring failure of cgroupfs files. Update it such that, if file creation fails, it rolls back by calling cgroup_destroy_locked() and returns failure. Note that error out goto labels are renamed. The labels are a bit confusing but will become better w/ later cgroup operation renames. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
2012-11-19cgroup: use mutex_trylock() when grabbing i_mutex of a new cgroup directoryTejun Heo
All cgroup directory i_mutexes nest outside cgroup_mutex; however, new directory creation is a special case. A new cgroup directory is created while holding cgroup_mutex. Populating the new directory requires both the new directory's i_mutex and cgroup_mutex. Because all directory i_mutexes nest outside cgroup_mutex, grabbing both requires releasing cgroup_mutex first, which isn't a good idea as the new cgroup isn't yet ready to be manipulated by other cgroup opreations. This is worked around by grabbing the new directory's i_mutex while holding cgroup_mutex before making it visible. As there's no other user at that point, grabbing the i_mutex under cgroup_mutex can't lead to deadlock. cgroup_create_file() was using I_MUTEX_CHILD to tell lockdep not to worry about the reverse locking order; however, this creates pseudo locking dependency cgroup_mutex -> I_MUTEX_CHILD, which isn't true - all directory i_mutexes are still nested outside cgroup_mutex. This pseudo locking dependency can lead to spurious lockdep warnings. Use mutex_trylock() instead. This will always succeed and lockdep doesn't create any locking dependency for it. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
2012-11-19cgroup: simplify cgroup_load_subsys() failure pathTejun Heo
Now that cgroup_unload_subsys() can tell whether the root css is online or not, we can safely call cgroup_unload_subsys() after idr init failure in cgroup_load_subsys(). Replace the manual unrolling and invoke cgroup_unload_subsys() on failure. This drops cgroup_mutex inbetween but should be safe as the subsystem will fail try_module_get() and thus can't be mounted inbetween. As this means that cgroup_unload_subsys() can be called before css_sets are rehashed, remove BUG_ON() on %NULL css_set->subsys[] from cgroup_unload_subsys(). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
2012-11-19cgroup: introduce CSS_ONLINE flag and on/offline_css() helpersTejun Heo
New helpers on/offline_css() respectively wrap ->post_create() and ->pre_destroy() invocations. online_css() sets CSS_ONLINE after ->post_create() is complete and offline_css() invokes ->pre_destroy() iff CSS_ONLINE is set and clears it while also handling the temporary dropping of cgroup_mutex. This patch doesn't introduce any behavior change at the moment but will be used to improve cgroup_create() failure path and allow ->post_create() to fail. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>
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