Waiman Long 9a5418bc48 sched/core: Use kfree_rcu() in do_set_cpus_allowed() ... Commit 851a723e45 ("sched: Always clear user_cpus_ptr in do_set_cpus_allowed()") may call kfree() if user_cpus_ptr was previously set. Unfortunately, some of the callers of do_set_cpus_allowed() may have pi_lock held when calling it. So the following splats may be printed especially when running with a PREEMPT_RT kernel: WARNING: possible circular locking dependency detected BUG: sleeping function called from invalid context To avoid these problems, kfree_rcu() is used instead. An internal cpumask_rcuhead union is created for the sole purpose of facilitating the use of kfree_rcu() to free the cpumask. Since user_cpus_ptr is not being used in non-SMP configs, the newly introduced alloc_user_cpus_ptr() helper will return NULL in this case and sched_setaffinity() is modified to handle this special case. Fixes: 851a723e45 ("sched: Always clear user_cpus_ptr in do_set_cpus_allowed()") Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20221231041120.440785-3-longman@redhat.com		2023-01-09 11:43:23 +01:00
..
Makefile	…
autogroup.c	sched/all: Change all BUG_ON() instances in the scheduler to WARN_ON_ONCE()	2022-08-12 11:25:10 +02:00
autogroup.h	…
build_policy.c	…
build_utility.c	…
clock.c	…
completion.c	sched/completion: Add wait_for_completion_state()	2022-09-07 21:53:49 +02:00
core.c	sched/core: Use kfree_rcu() in do_set_cpus_allowed()	2023-01-09 11:43:23 +01:00
core_sched.c	sched: Rename task_running() to task_on_cpu()	2022-09-07 21:53:47 +02:00
cpuacct.c	…
cpudeadline.c	…
cpudeadline.h	…
cpufreq.c	…
cpufreq_schedutil.c	Revert "cpufreq: schedutil: Move max CPU capacity to sugov_policy"	2022-11-22 19:56:52 +01:00
cpupri.c	sched/all: Change all BUG_ON() instances in the scheduler to WARN_ON_ONCE()	2022-08-12 11:25:10 +02:00
cpupri.h	…
cputime.c	…
deadline.c	sched: Introduce affinity_context	2022-10-27 11:01:21 +02:00
debug.c	- Yu Zhao's Multi-Gen LRU patches are here. They've been under test in	2022-10-10 17:53:04 -07:00
fair.c	sysctl changes for v6.2-rc1	2022-12-13 14:16:44 -08:00
features.h	…
idle.c	…
isolation.c	…
loadavg.c	…
membarrier.c	…
pelt.c	…
pelt.h	…
psi.c	sched/psi: Stop relying on timer_pending() for poll_work rescheduling	2022-10-30 10:12:14 +01:00
rt.c	sched: Introduce struct balance_callback to avoid CFI mismatches	2022-10-17 16:41:25 +02:00
sched-pelt.h	…
sched.h	sched: Enforce user requested affinity	2022-10-27 11:01:22 +02:00
smp.h	…
stats.c	…
stats.h	sched/psi: Use task->psi_flags to clear in CPU migration	2022-10-30 10:12:15 +01:00
stop_task.c	sched: Add update_current_exec_runtime helper	2022-08-27 00:05:35 +02:00
swait.c	…
topology.c	…
wait.c	wait: Return number of exclusive waiters awaken	2022-11-16 11:33:03 -07:00
wait_bit.c	wait_on_bit: add an acquire memory barrier	2022-08-26 09:30:25 -07:00