linux-kernel - Re: [RFC][PATCH] printk: Add option to append kernel version to the dict

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Date:	Sun, 15 May 2016 15:36:43 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Calvin Owens <calvinowens@...com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Howells <dhowells@...hat.com>,
	Pranith Kumar <bobby.prani@...il.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Petr Mladek <pmladek@...e.com>, Tejun Heo <tj@...nel.org>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Vasily Averin <vvs@...tuozzo.com>,
	Thierry Reding <treding@...dia.com>,
	Geliang Tang <geliangtang@....com>,
	Ivan Delalande <colona@...sta.com>,
	linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [RFC][PATCH] printk: Add option to append kernel version to the
 dict

Hello,

On (05/13/16 13:58), Calvin Owens wrote:
[..]
> +#if defined(CONFIG_PRINTK_APPEND_UNAME)
> +static ssize_t msg_print_ext_uname(char *buf, size_t size)
> +{
> +	return scnprintf(buf, size, " UNAME=%s\n", init_utsname()->release);
> +}
> +#else
> +static ssize_t msg_print_ext_uname(char *buf, size_t size)
> +{
> +	return 0;
> +}
> +#endif
> +
>  /* /dev/kmsg - userspace message inject/listen interface */
>  struct devkmsg_user {
>  	u64 seq;
> @@ -2305,6 +2317,8 @@ skip:
>  						sizeof(ext_text) - ext_len,
>  						log_dict(msg), msg->dict_len,
>  						log_text(msg), msg->text_len);
> +			ext_len += msg_print_ext_uname(ext_text + ext_len,
> +						sizeof(ext_text) - ext_len);
>  		}

what if there is no place left for init_utsname() after msg_print_ext_header() + msg_print_ext_body()?
do you need init_utsname in every message? or just in WARN/ERR ones?

	-ss