linux-kernel - Re: [PATCH] printk: Add caller information to printk() output.

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Date:   Tue, 4 Dec 2018 11:02:24 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Petr Mladek <pmladek@...e.com>, Dmitry Vyukov <dvyukov@...gle.com>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] printk: Add caller information to printk() output.

On (12/02/18 20:23), Tetsuo Handa wrote:
> 
> Some examples for console output:
> 
>   [    0.919699]@T1 x86: Booting SMP configuration:
>   [    4.152681]@T271 Fusion MPT base driver 3.04.20
>   [    5.070470]@C0 random: fast init done
>   [    6.587900]@C3 random: crng init done

This is hard to read. Let's have a fixed width space for from_id.

> +#ifdef CONFIG_PRINTK_FROM
> +	if (in_task())
> +		msg->from_id = current->pid;

Let's use task_pid_nr().

> -static size_t print_time(u64 ts, char *buf)
> -{
> -	unsigned long rem_nsec = do_div(ts, 1000000000);
> -
> -	if (!buf)
> -		return snprintf(NULL, 0, "[%5lu.000000] ", (unsigned long)ts);
> -
> -	return sprintf(buf, "[%5lu.%06lu] ",
> -		       (unsigned long)ts, rem_nsec / 1000);
> -}

OK, this patch depends on printk_time patch.

> +config PRINTK_FROM
> +	bool "Show caller information on printks"
> +	depends on PRINTK

Wasn't it supposed to also depend on DEBUG_AID_FOR_SYZBOT?

	-ss