linux-kernel - [PATCH] rcu: Put panic_on_rcu_stall() after expedited RCU CPU stall warnings

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Message-Id: <20220422131518.3090060-1-qiang1.zhang@intel.com>
Date:   Fri, 22 Apr 2022 21:15:18 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     paulmck@...nel.org, frederic@...nel.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rcu: Put panic_on_rcu_stall() after expedited RCU CPU stall warnings

When the expedited RCU CPU stall warning is treated as panic, if
it's triggered, the stall info should be printed first and tell us
reason, rather than directly panic.

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 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 571b0a700cce..f05a15b11fa0 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();
 	}
 }
 
-- 
2.25.1