linux-kernel - Re: [PATCH v3 2/2] printk: Add KBUILD

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Date:   Tue, 25 Sep 2018 13:34:48 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     zhe.he@...driver.com
Cc:     sergey.senozhatsky@...il.com, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] printk: Add KBUILD_MODNAME and correct wrong
 casting

On Sat 2018-09-22 23:40:52, zhe.he@...driver.com wrote:
> From: He Zhe <zhe.he@...driver.com>
> 
> Add KBUILD_MODNAME to make prints more clear and correct wrong casting that
> might cut off the normal output.
> 
> Signed-off-by: He Zhe <zhe.he@...driver.com>
> Cc: pmladek@...e.com
> Cc: sergey.senozhatsky@...il.com
> Cc: rostedt@...dmis.org
> ---
> v2:
> Correct one more place
> v3:
> Correct wrong casting
> 
>  kernel/printk/printk.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index d9821c0..6b059a0 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -16,6 +16,8 @@
>   *	01Mar01 Andrew Morton
>   */
>  
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +

This patch should remove all explicit prefixes to avoid duplication.
I see one:

	pr_info("printk: continuation disabled due to ext consoles, expect more fragments in /dev/kmsg\n");


>  #include <linux/kernel.h>
>  #include <linux/mm.h>
>  #include <linux/tty.h>
> @@ -2358,8 +2360,9 @@ void console_unlock(void)
>  		printk_safe_enter_irqsave(flags);
>  		raw_spin_lock(&logbuf_lock);
>  		if (console_seq < log_first_seq) {
> -			len = sprintf(text, "** %u printk messages dropped **\n",
> -				      (unsigned)(log_first_seq - console_seq));
> +			len = sprintf(text,
> +				      "** %llu printk messages dropped **\n",
> +				      log_first_seq - console_seq);

On the contrary, please, put this fix into a separate patch. It is a
candidate for stable backports.

Best Regards,
Petr