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completion: Use lockdep_assert_RT_in_threaded_ctx() in complete_all() 

The warning was intended to spot complete_all() users from hardirq
context on PREEMPT_RT. The warning as-is will also trigger in interrupt
handlers, which are threaded on PREEMPT_RT, which was not intended.

Use lockdep_assert_RT_in_threaded_ctx() which triggers in non-preemptive
context on PREEMPT_RT.

Fixes: a5c6234e10 ("completion: Use simple wait queues")
Reported-by: kernel test robot <rong.a.chen@intel.com>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200323152019.4qjwluldohuh3by5@linutronix.de
5.9.x+fslc
Sebastian Siewior 2020-03-23 16:20:19 +01:00 committed by Peter Zijlstra
parent d53f2b62fc
commit 8bf6c677dd
2 changed files with 16 additions and 1 deletions
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15
include/linux/lockdep.h
View File

@ -711,6 +711,21 @@ do { \
# define lockdep_assert_in_irq() do { } while (0)
#endif
#ifdef CONFIG_PROVE_RAW_LOCK_NESTING
# define lockdep_assert_RT_in_threaded_ctx() do { \
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
current->hardirq_context && \
!(current->hardirq_threaded || current->irq_config), \
"Not in threaded context on PREEMPT_RT as expected\n"); \
} while (0)
#else
# define lockdep_assert_RT_in_threaded_ctx() do { } while (0)
#endif
#ifdef CONFIG_LOCKDEP
void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
#else

2
kernel/sched/completion.c
View File

@ -58,7 +58,7 @@ void complete_all(struct completion *x)
{
unsigned long flags;
WARN_ON(irqs_disabled());
lockdep_assert_RT_in_threaded_ctx();
raw_spin_lock_irqsave(&x->wait.lock, flags);
x->done = UINT_MAX;