linux-kernel - Re: [patch 81/85] x86: fix RIP printout in early_idt

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Date:	Thu, 15 Jan 2009 20:13:04 -0800
From:	Greg KH <gregkh@...e.de>
To:	Jike Song <albcamus@...il.com>
Cc:	linux-kernel@...r.kernel.org, stable@...nel.org,
	Justin Forbes <jmforbes@...uxtx.org>,
	Zwane Mwaikambo <zwane@....linux.org.uk>,
	Theodore Ts'o <tytso@....edu>,
	Randy Dunlap <rdunlap@...otime.net>,
	Dave Jones <davej@...hat.com>,
	Chuck Wolber <chuckw@...ntumlinux.com>,
	Chris Wedgwood <reviews@...cw.f00f.org>,
	Michael Krufky <mkrufky@...uxtv.org>,
	Chuck Ebbert <cebbert@...hat.com>,
	Domenico Andreoli <cavokz@...il.com>, Willy Tarreau <w@....eu>,
	Rodrigo Rubira Branco <rbranco@...checkpoint.com>,
	Jake Edge <jake@....net>, Eugene Teo <eteo@...hat.com>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Jiri Slaby <jirislaby@...il.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [patch 81/85] x86: fix RIP printout in early_idt_handler

On Fri, Jan 16, 2009 at 11:27:57AM +0800, Jike Song wrote:
> On Fri, Jan 16, 2009 at 6:02 AM, Greg KH <gregkh@...e.de> wrote:
> > 2.6.27-stable review patch.  If anyone has any objections, please let us know.
> >
> > ------------------
> >
> > From: Jiri Slaby <jirislaby@...il.com>
> >
> > commit 7aed55d1085f71241284a30af0300feea48c36db upstream.
> >
> > Impact: fix debug/crash printout
> >
> > Since errorcode is popped out, RIP is on the top of the stack.
> > Use real RIP value instead of wrong CS.
> >
> > Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
> >
> > ---
> >  arch/x86/kernel/head_64.S |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > --- a/arch/x86/kernel/head_64.S
> > +++ b/arch/x86/kernel/head_64.S
> > @@ -305,7 +305,7 @@ ENTRY(early_idt_handler)
> >        call dump_stack
> >  #ifdef CONFIG_KALLSYMS
> >        leaq early_idt_ripmsg(%rip),%rdi
> > -       movq 8(%rsp),%rsi       # get rip again
> > +       movq 0(%rsp),%rsi       # get rip again
> >        call __print_symbol
> >  #endif
> >  #endif /* EARLY_PRINTK */
> 
> why not:
> 
>     movq (%rsp), %rsi
> 
> instead? Yes, it's all the same but 0 is just unnecessary.

I supposed in light of the previous verison having "8" it's to be a bit
more explicit :)

thanks,

greg k-h
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