diff options
| author | Paul E. McKenney <paulmck@kernel.org> | 2020-03-20 14:29:08 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-04-27 11:03:52 -0700 |
| commit | b38f57c1fe64276773b124dffb0a139cc32ab3cb (patch) | |
| tree | b69915f8632122f65bc6a692bf8edfbec71228ff /kernel/rcu/update.c | |
| parent | 7d0c9c50c5a109acd7a5cf589fc5563f9ef7149a (diff) | |
rcu-tasks: Allow rcu_read_unlock_trace() under scheduler locks
The rcu_read_unlock_trace() can invoke rcu_read_unlock_trace_special(),
which in turn can call wake_up(). Therefore, if any scheduler lock is
held across a call to rcu_read_unlock_trace(), self-deadlock can occur.
This commit therefore uses the irq_work facility to defer the wake_up()
to a clean environment where no scheduler locks will be held.
Reported-by: Steven Rostedt <rostedt@goodmis.org>
[ paulmck: Update #includes for m68k per kbuild test robot. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'kernel/rcu/update.c')
| -rw-r--r-- | kernel/rcu/update.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index c5799349ff31..b1f07a0e3a56 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -41,6 +41,7 @@ #include <linux/sched/isolation.h> #include <linux/kprobes.h> #include <linux/slab.h> +#include <linux/irq_work.h> #define CREATE_TRACE_POINTS |