linux-kernel - Re: [PATCH] lib/vsprintf: add %pT[C012] format specifier

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Date:	Sat, 28 Dec 2013 11:53:25 -0800
From:	Joe Perches <joe@...ches.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Jiri Kosina <jkosina@...e.cz>,
	Al Viro <viro@...iv.linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lib/vsprintf: add %pT[C012] format specifier

On Sat, 2013-12-28 at 20:25 +0100, Geert Uytterhoeven wrote:
> On Sat, Dec 28, 2013 at 8:25 PM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> >> Is any of the "\x" (backslash + character) unused and thus available?
> >
> > I guess control characters would work.
> >
> > #define PRINTK_COMM     "\001"
> 
> Not that one, cfr. include/linux/kern_levels.h ;-)

yup.

> > #define PRINTK_PID      "\002"
> > #define PRINTK_TASK_ID  "\003"  /* "comm:pid" */
> >
> >         printk(PRINTK_TASK_ID ": hair on fire\n");
> >
> > It's certainly compact.  I doubt if there's any existing code which
> > deliberately prints control chars?
> 
> But the rest looks OK to me.

Tell me again, what's wrong with using p or current?

printk("%pt", current);


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