From: Pavel Machek <pavel@ucw.cz>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Joe Perches <joe@perches.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Jiri Kosina <jkosina@suse.cz>, Al Viro <viro@zeniv.linux.org.uk>,
"David S. Miller" <davem@davemloft.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] lib/vsprintf: add %pT[C012] format specifier
Date: Thu, 2 Jan 2014 12:51:37 +0100 [thread overview]
Message-ID: <20140102115137.GA10982@amd.pavel.ucw.cz> (raw)
In-Reply-To: <20131228120815.31f7d378.akpm@linux-foundation.org>
Hi!
> > > > #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.
Can we do "printk("%pt", 0)", then? Or just pass current and live with
few bytes of penalty. There are probably less ugly ways to make kernel
smaller. Inventing another escape character for printk is extremely
ugly.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2014-01-02 11:51 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-25 12:37 [PATCH] lib/vsprintf: add %pT[C012] format specifier Tetsuo Handa
2013-12-26 8:43 ` Joe Perches
2013-12-27 23:02 ` Andrew Morton
2013-12-28 3:43 ` Tetsuo Handa
2013-12-28 18:57 ` Geert Uytterhoeven
2013-12-28 19:25 ` Andrew Morton
2013-12-28 19:25 ` Geert Uytterhoeven
2013-12-28 19:53 ` Joe Perches
2013-12-28 20:08 ` Andrew Morton
2013-12-28 20:24 ` Joe Perches
2013-12-29 0:32 ` Tetsuo Handa
2013-12-29 2:07 ` Joe Perches
2013-12-29 12:13 ` Tetsuo Handa
2013-12-30 16:55 ` Joe Perches
2013-12-31 6:53 ` Tetsuo Handa
2013-12-31 16:24 ` Joe Perches
2014-01-01 5:34 ` Tetsuo Handa
2014-01-01 5:49 ` Joe Perches
2014-01-01 10:02 ` Tetsuo Handa
2014-01-02 1:33 ` Joe Perches
2014-01-02 4:49 ` Tetsuo Handa
2014-01-03 17:08 ` Kees Cook
2014-01-03 17:39 ` Joe Perches
2014-01-03 17:49 ` Kees Cook
2014-01-04 2:26 ` Tetsuo Handa
2014-01-05 3:15 ` Tetsuo Handa
2014-01-05 18:09 ` Joe Perches
2014-01-06 14:00 ` Tetsuo Handa
2014-01-06 17:34 ` Joe Perches
2014-01-06 21:41 ` Tetsuo Handa
2014-01-06 22:25 ` Joe Perches
2014-01-07 0:16 ` Pavel Machek
2014-01-07 1:03 ` Joe Perches
2014-01-07 8:37 ` Pavel Machek
2014-01-07 17:34 ` Joe Perches
2014-01-07 17:56 ` Pavel Machek
2014-01-07 18:28 ` Geert Uytterhoeven
2014-01-08 14:19 ` Tetsuo Handa
2014-01-08 14:46 ` Pavel Machek
2014-01-06 21:34 ` Pavel Machek
2014-01-05 22:27 ` Pavel Machek
2014-01-06 14:02 ` Tetsuo Handa
2014-01-10 13:15 ` Tetsuo Handa
2014-01-02 1:38 ` Joe Perches
2014-01-02 11:51 ` Pavel Machek [this message]
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