linux-kernel - Re: sched: serial port lockdep warning when offlining CPUs

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Message-ID: <20170928114705.4a2iaek26qcdo7qk@hirez.programming.kicks-ass.net>
Date:   Thu, 28 Sep 2017 13:47:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Sasha Levin <levinsasha928@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        alexander.levin@...izon.com, pmladek@...e.com,
        sergey.senozhatsky@...il.com, rostedt@...dmis.org
Subject: Re: sched: serial port lockdep warning when offlining CPUs

On Thu, Sep 28, 2017 at 07:30:32PM +0900, Sergey Senozhatsky wrote:
> ---
> 
>  lib/ratelimit.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/ratelimit.c b/lib/ratelimit.c
> index 08f8043cac61..bddc55834c2e 100644
> --- a/lib/ratelimit.c
> +++ b/lib/ratelimit.c
> @@ -48,7 +48,8 @@ int ___ratelimit(struct ratelimit_state *rs, const char *func)
>  	if (time_is_before_jiffies(rs->begin + rs->interval)) {
>  		if (rs->missed) {
>  			if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE)) {
> -				pr_warn("%s: %d callbacks suppressed\n", func, rs->missed);
> +				printk_deferred(KERN_WARN "%s: %d callbacks suppressed\n",
> +						func, rs->missed);
>  				rs->missed = 0;
>  			}
>  		}

Oh cute; I figured it was the syslog daemon suppressing multiple
identical lines, but yes the above looks very plausible.