linux-kernel - Re: [PATCH printk v1 03/13] printk: use percpu flag instead of cpu

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Date:   Sat, 5 Mar 2022 10:05:02 -0700
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     John Ogness <john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH printk v1 03/13] printk: use percpu flag instead of
 cpu_online()

Hi Petr,

On Fri, Mar 04, 2022 at 04:56:55PM +0100, Petr Mladek wrote:

> Just for record, the right commit ID in the mainline is
> 1b710b1b10eff9d466. It used printk_deferred() in _warn_unseeded_randomness():
> 
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -1687,8 +1687,9 @@ static void _warn_unseeded_randomness(const char *func_name, void *caller,
>  	print_once = true;
>  #endif
>  	if (__ratelimit(&unseeded_warning))
> -		pr_notice("random: %s called from %pS with crng_init=%d\n",
> -			  func_name, caller, crng_init);
> +		printk_deferred(KERN_NOTICE "random: %s called from %pS "
> +				"with crng_init=%d\n", func_name, caller,
> +				crng_init);
>  }

Are we able to revert this yet? Or is it still required because of
locking issues? Would gladly take a patch to revert that if the
non-deferred function is fine for 5.18.

Jason