From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>, Will Deacon <will@kernel.org>,
"Paul E . McKenney" <paulmck@kernel.org>,
Joel Fernandes <joel@joelfernandes.org>,
Steven Rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 9/9] lockdep: Add posixtimer context tracing bits
Date: Fri, 13 Mar 2020 18:47:01 +0100 [thread overview]
Message-ID: <20200313174701.148376-10-bigeasy@linutronix.de> (raw)
In-Reply-To: <20200313174701.148376-1-bigeasy@linutronix.de>
Splitting run_posix_cpu_timers() into two parts is work in progress which
is stuck on other entry code related problems. The heavy lifting which
involves locking of sighand lock will be moved into task context so the
necessary execution time is burdened on the task and not on interrupt
context.
Until this work completes lockdep with the spinlock nesting rules enabled
would emit warnings for this known context.
Prevent it by setting "->irq_config = 1" for the invocation of
run_posix_cpu_timers() so lockdep does not complain when sighand lock is
acquried. This will be removed once the split is completed.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
include/linux/irqflags.h | 12 ++++++++++++
kernel/time/posix-cpu-timers.c | 6 +++++-
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
index f23f540e0ebba..a16adbb58f66a 100644
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -69,6 +69,16 @@ do { \
current->irq_config = 0; \
} while (0)
+# define lockdep_posixtimer_enter() \
+ do { \
+ current->irq_config = 1; \
+ } while (0)
+
+# define lockdep_posixtimer_exit() \
+ do { \
+ current->irq_config = 0; \
+ } while (0)
+
# define lockdep_irq_work_enter(__work) \
do { \
if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
@@ -94,6 +104,8 @@ do { \
# define lockdep_softirq_exit() do { } while (0)
# define lockdep_hrtimer_enter(__hrtimer) do { } while (0)
# define lockdep_hrtimer_exit(__hrtimer) do { } while (0)
+# define lockdep_posixtimer_enter() do { } while (0)
+# define lockdep_posixtimer_exit() do { } while (0)
# define lockdep_irq_work_enter(__work) do { } while (0)
# define lockdep_irq_work_exit(__work) do { } while (0)
#endif
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 8ff6da77a01fd..2c48a7233b196 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -1126,8 +1126,11 @@ void run_posix_cpu_timers(void)
if (!fastpath_timer_check(tsk))
return;
- if (!lock_task_sighand(tsk, &flags))
+ lockdep_posixtimer_enter();
+ if (!lock_task_sighand(tsk, &flags)) {
+ lockdep_posixtimer_exit();
return;
+ }
/*
* Here we take off tsk->signal->cpu_timers[N] and
* tsk->cpu_timers[N] all the timers that are firing, and
@@ -1169,6 +1172,7 @@ void run_posix_cpu_timers(void)
cpu_timer_fire(timer);
spin_unlock(&timer->it_lock);
}
+ lockdep_posixtimer_exit();
}
/*
--
2.25.1
prev parent reply other threads:[~2020-03-13 17:47 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-13 17:46 [PATCH 0/9] Lock ordering documentation and annotation for lockdep Sebastian Andrzej Siewior
2020-03-13 17:46 ` [PATCH 1/9] Documentation: Add lock ordering and nesting documentation Sebastian Andrzej Siewior
2020-03-14 22:57 ` Randy Dunlap
2020-03-16 10:34 ` Sebastian Andrzej Siewior
2020-03-16 15:13 ` Randy Dunlap
2020-03-13 17:46 ` [PATCH 2/9] timekeeping: Split jiffies seqlock Sebastian Andrzej Siewior
2020-03-13 17:46 ` [PATCH 3/9] pci/switchtec: Don't abuse completion wait queue for poll Sebastian Andrzej Siewior
2020-03-13 18:11 ` Logan Gunthorpe
2020-03-14 0:23 ` Thomas Gleixner
2020-03-14 6:01 ` Logan Gunthorpe
2020-03-16 18:52 ` Thomas Gleixner
2020-03-16 19:24 ` Logan Gunthorpe
2020-03-16 19:34 ` Thomas Gleixner
2020-03-16 21:53 ` Logan Gunthorpe
2020-03-17 0:17 ` Thomas Gleixner
2020-03-17 1:15 ` Logan Gunthorpe
2020-03-13 19:31 ` Peter Zijlstra
2020-03-13 17:46 ` [PATCH 4/9] sched/swait: Prepare usage in completions Sebastian Andrzej Siewior
2020-03-14 0:26 ` Thomas Gleixner
2020-03-13 17:46 ` [PATCH 5/9] completion: Use simple wait queues Sebastian Andrzej Siewior
2020-03-14 15:40 ` Linus Torvalds
2020-03-16 18:55 ` Thomas Gleixner
2020-03-13 17:46 ` [PATCH 6/9] lockdep: Introduce wait-type checks Sebastian Andrzej Siewior
2020-03-31 13:25 ` Geert Uytterhoeven
2020-03-31 13:42 ` Sebastian Andrzej Siewior
2020-03-31 14:55 ` Peter Zijlstra
2020-03-31 15:28 ` Peter Zijlstra
2020-03-31 15:37 ` Frederic Weisbecker
2020-03-13 17:46 ` [PATCH 7/9] lockdep: Add hrtimer context tracing bits Sebastian Andrzej Siewior
2020-03-13 17:47 ` [PATCH 8/9] lockdep: Annotate irq_work Sebastian Andrzej Siewior
2020-03-13 17:47 ` Sebastian Andrzej Siewior [this message]
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