linux-kernel - Re: [PATCH v2] early_printk: consolidate random copies of identical code

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Message-Id: <20130307134318.c158500d46c7f4a1a47cf2e7@linux-foundation.org>
Date:	Thu, 7 Mar 2013 13:43:18 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Mike Frysinger <vapier@...too.org>,
	Ingo Molnar <mingo@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-kernel@...r.kernel.org,
	Russell King <linux@....linux.org.uk>,
	Michal Simek <monstr@...str.eu>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Chris Metcalf <cmetcalf@...era.com>,
	Richard Weinberger <richard@....at>
Subject: Re: [PATCH v2] early_printk: consolidate random copies of identical
 code

On Thu, 7 Mar 2013 22:25:48 +0100 (CET) Thomas Gleixner <tglx@...utronix.de> wrote:

> > diff --git a/kernel/printk.c b/kernel/printk.c
> > index 7664e49..86799bf 100644
> > --- a/kernel/printk.c
> > +++ b/kernel/printk.c
> > @@ -120,6 +120,7 @@ struct console_cmdline
> >  static struct console_cmdline console_cmdline[MAX_CMDLINECONSOLES];
> >  static int selected_console = -1;
> >  static int preferred_console = -1;
> > +struct console *early_console;
> >  int console_set_on_cmdline;
> >  EXPORT_SYMBOL(console_set_on_cmdline);
> >  
> > @@ -1718,7 +1719,6 @@ static size_t cont_print_text(char *text, size_t size) { return 0; }
> >  #endif /* CONFIG_PRINTK */
> >  
> >  #ifdef CONFIG_EARLY_PRINTK
> > -struct console *early_console;
> >  
> >  void early_vprintk(const char *fmt, va_list ap)
> >  {
> > 
> > 
> > Then you don't have to spray any of those ifdefs into the sparc code.
> 
> Yeah, that's what I thought as well. The extra pointer is not going to
> create massive bloat :)

It's a bit hacky though.  If CONFIG_EARLY_PRINTK=n then that code just
shouldn't exist.  If we let it persist then maybe it's doing other
wrong stuff as well.
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