linux-kernel - Re: setup_arch/arch_get_boot_command

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Message-Id: <200812102315.01416.rusty@rustcorp.com.au>
Date:	Wed, 10 Dec 2008 23:14:59 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Kyle McMartin <kyle@...radead.org>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, dhowells@...hat.com,
	Richard Henderson <rth@...ddle.net>,
	Russell King <rmk@....linux.org.uk>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Bryan Wu <cooloney@...nel.org>,
	Mikael Starvik <starvik@...s.com>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Tony Luck <tony.luck@...el.com>,
	Hirokazu Takata <takata@...ux-m32r.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Greg Ungerer <gerg@...inux.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	linux-parisc@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jeff Dike <jdike@...toit.com>, Ingo Molnar <mingo@...hat.com>,
	Chris Zankel <chris@...kel.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: setup_arch/arch_get_boot_command_line changes

On Wednesday 10 December 2008 09:29:31 Kyle McMartin wrote:
> On Wed, Dec 10, 2008 at 08:50:24AM +1030, Rusty Russell wrote:
> > Rusty Russell (10):
> > <snip>
> >       param: move banner printing to top of start_kernel.    
> > 
> 
> Will this not run afoul of lockdep since it will be attempting to take
> locks before lockdep has initialized?

Hmm, works for me here.  But then, i386_start_kernel -> reserve_ebda_region
->printk already, so that banner is *still* not first line.

> (as an aside, it would be nice if it came after setup_arch, since on
> some horrible platforms, printk_time needs the fpu turned on for
> (integer) division, but there's no arch hook before the first printk, so
> one needs to hijack the start_kernel entrypoint...)

That won't help much, since a failed kernel parameter parse will also call
printk.  I don't think it's sane to call start_kernel without the
ability to do integer division!

Rusty.
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