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

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Message-Id: <201401070641.HAC18733.VOFMFOLOJQSFHt@I-love.SAKURA.ne.jp>
Date:	Tue, 7 Jan 2014 06:41:44 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	joe@...ches.com
Cc:	keescook@...omium.org, pavel@....cz, 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

Joe Perches wrote:
> On Mon, 2014-01-06 at 23:00 +0900, Tetsuo Handa wrote:
> > Joe Perches wrote:
> > > Is this really necessary?
> > No problem. %pT[012] are simply optimization (reducing number of function
> > arguments for saving text size) and therefore I can drop them.
> > What about below patch?
> 
> Hi Tetsuo.  Just a nit.
> 
> > 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.
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