linux-kernel - Re: [PATCH 1/2] printk: Add new pr_*_deferred

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Date:   Mon, 25 Jan 2021 11:37:02 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Qais Yousef <qais.yousef@....com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] printk: Add new pr_*_deferred_once() variants

On Sat, Jan 23, 2021 at 11:37:40PM +0000, Qais Yousef wrote:
> To allow users in code where printk is not allowed.
> 
> Signed-off-by: Qais Yousef <qais.yousef@....com>
> ---
>  include/linux/printk.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/include/linux/printk.h b/include/linux/printk.h
> index fe7eb2351610..92c0978c7b44 100644
> --- a/include/linux/printk.h
> +++ b/include/linux/printk.h
> @@ -480,21 +480,45 @@ extern int kptr_restrict;
>  	printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
>  /* no pr_cont_once, don't do that... */
>  
> +#define pr_emerg_deferred_once(fmt, ...)				\
> +	printk_deferred_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
> +#define pr_alert_deferred_once(fmt, ...)				\
> +	printk_deferred_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
> +#define pr_crit_deferred_once(fmt, ...)					\
> +	printk_deferred_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
> +#define pr_err_deferred_once(fmt, ...)					\
> +	printk_deferred_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
> +#define pr_warn_deferred_once(fmt, ...)					\
> +	printk_deferred_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
> +#define pr_notice_deferred_once(fmt, ...)				\
> +	printk_deferred_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
> +#define pr_info_deferred_once(fmt, ...)					\
> +	printk_deferred_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
> +/* no pr_cont_deferred_once, don't do that... */

I absolutely detest this.. the whole _deferred thing is an abomination.

We should be very close to printk not needing this anymore, printk
people?