linux-kernel - [PATCH 2/2] hrtimer: Use pr_warn_deferred_once() in hrtimer

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Message-Id: <20210123233741.3614408-3-qais.yousef@arm.com>
Date:   Sat, 23 Jan 2021 23:37:41 +0000
From:   Qais Yousef <qais.yousef@....com>
To:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, Qais Yousef <qais.yousef@....com>
Subject: [PATCH 2/2] hrtimer: Use pr_warn_deferred_once() in hrtimer_interrupt()

printk is not allowed in this context and causes a BUG: Invalid wait context.

Signed-off-by: Qais Yousef <qais.yousef@....com>
---
 kernel/time/hrtimer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 743c852e10f2..2d9b7cf1d5e2 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1700,7 +1700,8 @@ void hrtimer_interrupt(struct clock_event_device *dev)
 	else
 		expires_next = ktime_add(now, delta);
 	tick_program_event(expires_next, 1);
-	pr_warn_once("hrtimer: interrupt took %llu ns\n", ktime_to_ns(delta));
+	pr_warn_deferred_once("hrtimer: interrupt took %llu ns\n",
+			      ktime_to_ns(delta));
 }
 
 /* called with interrupts disabled */
-- 
2.25.1