Qais Yousef 2c0000f409 sched/uclamp: Fix a deadlock when enabling uclamp static key ...

[ Upstream commit e65855a52b ]

The following splat was caught when setting uclamp value of a task:

  BUG: sleeping function called from invalid context at ./include/linux/percpu-rwsem.h:49

   cpus_read_lock+0x68/0x130
   static_key_enable+0x1c/0x38
   __sched_setscheduler+0x900/0xad8

Fix by ensuring we enable the key outside of the critical section in
__sched_setscheduler()

Fixes: 46609ce227 ("sched/uclamp: Protect uclamp fast path code with static key")
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200716110347.19553-4-qais.yousef@arm.com
Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-09-03 11:26:49 +02:00

..

autogroup.c

sched/autogroup: Make autogroup_path() always available

2019-06-24 19:23:40 +02:00

autogroup.h

sched/headers: Simplify and clean up header usage in the scheduler

2018-03-04 12:39:29 +01:00

clock.c

treewide: Add SPDX license identifier for missed files

2019-05-21 10:50:45 +02:00

completion.c

sched/Documentation: Update wake_up() & co. memory-barrier guarantees

2018-07-17 09:30:34 +02:00

core.c

sched/uclamp: Fix a deadlock when enabling uclamp static key

2020-09-03 11:26:49 +02:00

cpuacct.c

sched/headers: Simplify and clean up header usage in the scheduler

2018-03-04 12:39:29 +01:00

cpudeadline.c

Merge tag 'v5.2-rc5' into sched/core, to pick up fixes

2019-06-17 12:12:27 +02:00

cpudeadline.h

sched/headers: Simplify and clean up header usage in the scheduler

2018-03-04 12:39:29 +01:00

cpufreq_schedutil.c

sched/uclamp: Protect uclamp fast path code with static key

2020-09-03 11:26:49 +02:00

cpufreq.c

cpufreq: Avoid leaving stale IRQ work items during CPU offline

2019-12-31 16:46:06 +01:00

cpupri.c

Merge tag 'v5.2-rc5' into sched/core, to pick up fixes

2019-06-17 12:12:27 +02:00

cpupri.h

sched/headers: Simplify and clean up header usage in the scheduler

2018-03-04 12:39:29 +01:00

cputime.c

sched/vtime: Fix guest/system mis-accounting on task switch

2019-10-09 12:38:03 +02:00

deadline.c

sched/deadline: Initialize ->dl_boosted

2020-06-30 15:37:02 -04:00

debug.c

sched/debug: Make sd->flags sysctl read-only

2020-07-09 09:37:50 +02:00

fair.c

sched/fair: Fix NOHZ next idle balance

2020-08-19 08:15:53 +02:00

features.h

sched/fair: Replace source_load() & target_load() with weighted_cpuload()

2019-06-03 11:49:39 +02:00

idle.c

sched/core: Further clarify sched_class::set_next_task()

2020-01-26 10:01:03 +01:00

isolation.c

sched/isolation: Prefer housekeeping CPU in local node

2019-07-25 15:51:55 +02:00

loadavg.c

timers/nohz: Update NOHZ load in remote tick

2020-03-05 16:43:36 +01:00

Makefile

psi: pressure stall information for CPU, memory, and IO

2018-10-26 16:26:32 -07:00

membarrier.c

membarrier: Fix RCU locking bug caused by faulty merge

2019-10-01 21:27:50 +02:00

pelt.c

sched/debug: Add new tracepoint to track PELT at se level

2019-06-24 19:23:42 +02:00

pelt.h

sched/topology: Remove unused 'sd' parameter from arch_scale_cpu_capacity()

2019-06-24 19:23:39 +02:00

psi.c

sched/psi: Fix OOB write when writing 0 bytes to PSI files

2020-02-28 17:22:21 +01:00

rt.c

sched: Defend cfs and rt bandwidth quota against overflow

2020-06-22 09:31:07 +02:00

sched-pelt.h

sched/fair: Fix "runnable_avg_yN_inv" not used warnings

2019-06-17 12:15:58 +02:00

sched.h

sched/uclamp: Protect uclamp fast path code with static key

2020-09-03 11:26:49 +02:00

stats.c

proc: introduce proc_create_seq{,_data}

2018-05-16 07:23:35 +02:00

stats.h

sched/stats: Fix unlikely() use of sched_info_on()

2019-07-25 15:51:55 +02:00

stop_task.c

sched/core: Further clarify sched_class::set_next_task()

2020-01-26 10:01:03 +01:00

swait.c

kernel/sched/: remove caller signal_pending branch predictions

2019-01-04 13:13:48 -08:00

topology.c

sched: correct SD_flags returned by tl->sd_flags()

2020-08-19 08:15:54 +02:00

wait_bit.c

treewide: Add SPDX license identifier for missed files

2019-05-21 10:50:45 +02:00

wait.c

sched/wait: Deduplicate code with do-while

2019-06-24 19:23:40 +02:00