linux-kernel - [PATCH rcu 11/12] torture: Flush printk() buffers before powering off

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Message-Id: <20220620225817.3843106-11-paulmck@kernel.org>
Date:   Mon, 20 Jun 2022 15:58:16 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        rostedt@...dmis.org, "Paul E. McKenney" <paulmck@...nel.org>,
        John Ogness <john.ogness@...utronix.de>
Subject: [PATCH rcu 11/12] torture: Flush printk() buffers before powering off

The rcutorture test suite produces quite a bit of console output
at the end of a test.  This means that the new printk() kthreads
are likely to be in the process of flushing output at the time of
the torture_shutdown() function's call to kernel_power_off().

This commit therefore invokes pr_flush(1000, true) to flush this
pending console output before invoking kernel_power_off().

Fixes: 8e274732115f ("printk: extend console_lock for per-console locking")
Cc: John Ogness <john.ogness@...utronix.de>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/torture.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/torture.c b/kernel/torture.c
index 789aeb0e1159c..6d7b282fbb5f8 100644
--- a/kernel/torture.c
+++ b/kernel/torture.c
@@ -651,6 +651,7 @@ static int torture_shutdown(void *arg)
 		VERBOSE_TOROUT_STRING("No torture_shutdown_hook(), skipping.");
 	if (ftrace_dump_at_shutdown)
 		rcu_ftrace_dump(DUMP_ALL);
+	pr_flush(1000, true);
 	kernel_power_off();	/* Shut down the system. */
 	return 0;
 }
-- 
2.31.1.189.g2e36527f23