From: "Paul E. McKenney" <paulmck@kernel.org>
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
rostedt@goodmis.org, Zqiang <qiang1.zhang@intel.com>,
"Paul E . McKenney" <paulmck@kernel.org>
Subject: [PATCH rcu 10/12] rcu: Put panic_on_rcu_stall() after expedited RCU CPU stall warnings
Date: Mon, 20 Jun 2022 15:51:26 -0700 [thread overview]
Message-ID: <20220620225128.3842050-10-paulmck@kernel.org> (raw)
In-Reply-To: <20220620224943.GA3841634@paulmck-ThinkPad-P17-Gen-1>
From: Zqiang <qiang1.zhang@intel.com>
When a normal RCU CPU stall warning is encountered with the
panic_on_rcu_stall sysfs variable is set, the system panics only after
the stall warning is printed. But when an expedited RCU CPU stall
warning is encountered with the panic_on_rcu_stall sysfs variable is
set, the system panics first, thus never printing the stall warning.
This commit therefore brings the expedited stall warning into line with
the normal stall warning by printing first and panicking afterwards.
Signed-off-by: Zqiang <qiang1.zhang@intel.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
kernel/rcu/tree_exp.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 571b0a700cced..f05a15b11fa0c 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -623,7 +623,6 @@ static void synchronize_rcu_expedited_wait(void)
return;
if (rcu_stall_is_suppressed())
continue;
- panic_on_rcu_stall();
trace_rcu_stall_warning(rcu_state.name, TPS("ExpeditedStall"));
pr_err("INFO: %s detected expedited stalls on CPUs/tasks: {",
rcu_state.name);
@@ -671,6 +670,7 @@ static void synchronize_rcu_expedited_wait(void)
}
}
jiffies_stall = 3 * rcu_exp_jiffies_till_stall_check() + 3;
+ panic_on_rcu_stall();
}
}
--
2.31.1.189.g2e36527f23
next prev parent reply other threads:[~2022-06-20 22:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-20 22:49 [PATCH rcu 0/12] Polled grace-period updates for v5.20 Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 01/12] rcu: Make normal polling GP be more precise about sequence numbers Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 02/12] rcu: Provide a get_completed_synchronize_rcu() function Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 03/12] rcutorture: Validate get_completed_synchronize_rcu() Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 04/12] rcu: Switch polled grace-period APIs to ->gp_seq_polled Paul E. McKenney
2022-07-21 0:53 ` Boqun Feng
2022-07-21 1:04 ` Paul E. McKenney
2022-07-21 1:51 ` Boqun Feng
2022-07-21 4:47 ` Paul E. McKenney
2022-07-21 5:49 ` Boqun Feng
2022-07-22 1:03 ` Paul E. McKenney
2022-07-21 1:56 ` Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 05/12] rcu: Make polled grace-period API account for expedited grace periods Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 06/12] rcu: Make Tiny RCU grace periods visible to polled APIs Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 07/12] rcutorture: Verify that polled GP API sees synchronous grace periods Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 08/12] rcu: Add polled expedited grace-period primitives Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 09/12] rcutorture: Test " Paul E. McKenney
2022-06-20 22:51 ` Paul E. McKenney [this message]
2022-06-20 22:51 ` [PATCH rcu 11/12] rcu: Diagnose extended sync_rcu_do_polled_gp() loops Paul E. McKenney
2022-06-20 22:51 ` [PATCH rcu 12/12] rcu: Add irqs-disabled indicator to expedited RCU CPU stall warnings Paul E. McKenney
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