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- Raspberry Pi: Using the RT patches and select RT as PREEMPT - Pipewire changes to upvote itself to prio 95% nice -19 - Other small kernel tweaks and fixes
52 lines
2.1 KiB
Diff
52 lines
2.1 KiB
Diff
From 5c27e6fdf46d68180a46fdf7944aa7e4668680c3 Mon Sep 17 00:00:00 2001
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From: Wander Lairson Costa <wander@redhat.com>
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Date: Wed, 14 Jun 2023 09:23:22 -0300
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Subject: [PATCH 57/62] sched: avoid false lockdep splat in put_task_struct()
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In put_task_struct(), a spin_lock is indirectly acquired under the kernel
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stock. When running the kernel in real-time (RT) configuration, the
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operation is dispatched to a preemptible context call to ensure
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guaranteed preemption. However, if PROVE_RAW_LOCK_NESTING is enabled
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and __put_task_struct() is called while holding a raw_spinlock, lockdep
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incorrectly reports an "Invalid lock context" in the stock kernel.
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This false splat occurs because lockdep is unaware of the different
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route taken under RT. To address this issue, override the inner wait
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type to prevent the false lockdep splat.
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Signed-off-by: Wander Lairson Costa <wander@redhat.com>
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Suggested-by: Oleg Nesterov <oleg@redhat.com>
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Suggested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Suggested-by: Peter Zijlstra <peterz@infradead.org>
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Cc: Steven Rostedt <rostedt@goodmis.org>
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Cc: Luis Goncalves <lgoncalv@redhat.com>
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Link: https://lore.kernel.org/r/20230614122323.37957-3-wander@redhat.com
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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(cherry picked from commit a5e446e728e89d5f5c5e427cc919bc7813c64c28)
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Signed-off-by: Clark Williams <clark.williams@gmail.com>
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---
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include/linux/sched/task.h | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
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index 7291fb6399d2..de7ebd2bf3ba 100644
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--- a/include/linux/sched/task.h
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+++ b/include/linux/sched/task.h
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@@ -141,8 +141,12 @@ static inline void put_task_struct(struct task_struct *t)
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*/
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if (IS_ENABLED(CONFIG_PREEMPT_RT) && !preemptible())
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call_rcu(&t->rcu, __put_task_struct_rcu_cb);
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- else
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+ else {
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+ static DEFINE_WAIT_OVERRIDE_MAP(put_task_map, LD_WAIT_SLEEP);
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+ lock_map_acquire_try(&put_task_map);
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__put_task_struct(t);
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+ lock_map_release(&put_task_map);
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+ }
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}
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static inline void put_task_struct_many(struct task_struct *t, int nr)
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--
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2.43.0
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