linux-kernel - Re: [PATCH] ttyprintk: make the printk log level configurable

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Date:   Fri, 7 Sep 2018 09:50:06 +0200
From:   Peter Korsgaard <peter@...sgaard.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ttyprintk: make the printk log level configurable

On Tue, Aug 21, 2018 at 7:28 PM Peter Korsgaard <peter@...sgaard.com> wrote:
>
> For some use cases it is handy to use a different printk log level than the
> default (info) for the messages written to ttyprintk, so add a Kconfig
> option similar to what we have for default console loglevel.

Ping? Feedback, comments?

> diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
> index ce277ee0a28a..14a7f023f20b 100644
> --- a/drivers/char/Kconfig
> +++ b/drivers/char/Kconfig
> @@ -66,6 +66,14 @@ config TTY_PRINTK
>
>           If unsure, say N.
>
> +config TTY_PRINTK_LEVEL
> +       depends on TTY_PRINTK
> +       int "ttyprintk log level (1-7)"
> +       range 1 7
> +       default "6"
> +       help
> +         Printk log level to use for ttyprintk messages.
> +
>  config PRINTER
>         tristate "Parallel printer support"
>         depends on PARPORT
> diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c
> index 67549ce88cc9..22fbd483b5dc 100644
> --- a/drivers/char/ttyprintk.c
> +++ b/drivers/char/ttyprintk.c
> @@ -37,6 +37,8 @@ static struct ttyprintk_port tpk_port;
>   */
>  #define TPK_STR_SIZE 508 /* should be bigger then max expected line length */
>  #define TPK_MAX_ROOM 4096 /* we could assume 4K for instance */
> +#define TPK_PREFIX KERN_SOH __stringify(CONFIG_TTY_PRINTK_LEVEL) " [U]"
> +
>  static int tpk_curr;
>
>  static char tpk_buffer[TPK_STR_SIZE + 4];
> @@ -45,7 +47,7 @@ static void tpk_flush(void)
>  {
>         if (tpk_curr > 0) {
>                 tpk_buffer[tpk_curr] = '\0';
> -               pr_info("[U] %s\n", tpk_buffer);
> +               printk(TPK_PREFIX " %s\n", tpk_buffer);
>                 tpk_curr = 0;
>         }
>  }
> --
> 2.11.0
>

-- 
Bye, Peter Korsgaard