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

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Date:	Mon, 06 Jan 2014 17:03:55 -0800
From:	Joe Perches <joe@...ches.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	keescook@...omium.org, akpm@...ux-foundation.org,
	geert@...ux-m68k.org, jkosina@...e.cz, viro@...iv.linux.org.uk,
	davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/vsprintf: add %pT[C012] format specifier

On Tue, 2014-01-07 at 01:16 +0100, Pavel Machek wrote:
> > > > > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > > > []
> > > > > @@ -1232,7 +1248,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
> > > > >  {
> > > > >  	int default_width = 2 * sizeof(void *) + (spec.flags & SPECIAL ? 2 : 0);
> > > > >  
> > > > > -	if (!ptr && *fmt != 'K') {
> > > > > +	if (!ptr && *fmt != 'K' && *fmt != 'T') {
> > > > 
> > > > I think this new 'T' comparison isn't necessary.
> > > 
> > > This is needed for allowing comm_name() to accept NULL instead of current.
> > 
> > Yeah, that's what I think isn't necessary.
> > 
> > current is current_thread_info()->task.
> > 
> > I think it's pretty lightweight in all arches and
> > it'd be simpler/more intelligible to not use NULL.
> > 
> > Andrew?  Any opinion?  Anyone else?
> 
> Andrew was worried about all the "current" duplication, IIRC. It is in
> the mail thread somewhere. And one condition in printk is price worth paying.
>     	 		       	   	     	       	  	      Pavel

Hi Pavel.

I'm not nacking this, just stating my view.

I believe I showed how many uses of vsprintf w/ current
there are.  Passing NULL vs passing current as the %pT
argument is I think a negligible overall size delta too.

cheers, Joe

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