linux-kernel - Re: [PATCH v5 2/2] printk: console: Support console-specific loglevels

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Message-ID: <ZFEdnY27pZlBvlih@chrisdown.name>
Date:   Tue, 2 May 2023 15:26:37 +0100
From:   Chris Down <chris@...isdown.name>
To:     Petr Mladek <pmladek@...e.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>, kernel-team@...com
Subject: Re: [PATCH v5 2/2] printk: console: Support console-specific
 loglevels

Thanks for the detailed feedback! All comments not explicitly replied to are 
acked and will be updated in v6.

Petr Mladek writes:
>> @@ -2293,7 +2429,14 @@ asmlinkage int vprintk_emit(int facility, int level,
>>  		in_sched = true;
>>  	}
>>
>> -	printk_delay(level);
>> +	cookie = console_srcu_read_lock();
>> +	for_each_console_srcu(con) {
>> +		if (!suppress_message_printing(level, con)) {
>> +			printk_delay();
>
>This would repeat the delay for each registered and non-supressed console.
>But it should be called only once when there is at least one
>non-suppressed console.
>
>> +			break;
>> +		}
>> +	}
>> +	console_srcu_read_unlock(cookie);

Doesn't the `break' below avoid that already? Maybe I'm missing something?

[...]

>> +static int printk_sysctl_deprecated(struct ctl_table *table, int write,
>> +				    void *buffer, size_t *lenp, loff_t *ppos)
>> +{
>> +	int res = proc_dointvec(table, write, buffer, lenp, ppos);
>> +
>> +	if (write)
>> +		pr_warn_once(
>> +			"printk: The kernel.printk sysctl is deprecated. Consider using kernel.console_loglevel or kernel.default_message_loglevel instead.\n");
>
>Nit: Please, put it on the same line as pr_warn_once("printk: The kernel....
>     The small shift left did not help much ;-)

I think this is done by clang-format with kernel default config, since my 
preference is single line as well. Maybe worth discussing changing the config?

>How does this sounds, please?

Sounds great! Thank you again for the very detailed feedback :-)