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

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Message-ID: <bc10850410b2c58c2bfbfa4f412403db7c82b535.camel@perches.com>
Date:   Fri, 07 Sep 2018 01:03:12 -0700
From:   Joe Perches <joe@...ches.com>
To:     Peter Korsgaard <peter@...sgaard.com>,
        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 Fri, 2018-09-07 at 09:50 +0200, Peter Korsgaard wrote:
> 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?

I think it is moving "[U]" into TPK_LEVEL is an
unnecessary and a tad obfuscating change.

This also adds a leading space for unknown reasons
after the KERN_SOH <level>.

> > 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]"

I think this should be

#define TPK_PREFIX KERN_SOH __stringify(CONFIG_TTY_PRINTK_LEVEL)

> > +
> >  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);

and this

		printk(TPK_PREFIX "[U] %s\n", tpk_buffer);

> >                 tpk_curr = 0;
> >         }
> >  }
> > --
> > 2.11.0
> > 
> 
>