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

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Date:	Sat, 28 Dec 2013 12:24:53 -0800
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.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 12:08 -0800, Andrew Morton wrote:
> On Sat, 28 Dec 2013 11:53:25 -0800 Joe Perches <joe@...ches.com> wrote:
> 
> > > > #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);
> 
> Nothing much.  It's just that all these callsites are generating the
> code to pass an argument which the callee already has access to. 
> Optimizing that will reduce text size a bit.

There have been smaller reductions in code size
than that...

> There's also the matter of providing a standard and abstracted way of
> representing a task, instead of directly accessing its ->comm.  But
> that's a separate thing from new printk tokens.

OK then perhaps use KERN_<ATTR> or CURRENT_<ATTR>
rather than PRINTK_<ATTR>



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