linux-kernel - Re: [PATCH] i386: Do backtrace fallback too

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Message-ID: <20060729102810.GA26709@harddisk-recovery.com>
Date:	Sat, 29 Jul 2006 12:28:10 +0200
From:	Erik Mouw <erik@...ddisk-recovery.com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH] i386: Do backtrace fallback too

On Sat, Jul 29, 2006 at 03:54:14AM -0400, Dave Jones wrote:
> On Sat, Jul 29, 2006 at 03:00:06AM +0000, Linux Kernel wrote:
>  > commit c97d20a6c51067a38f53680d9609b4cf2867d077

[...]

> Hmm, this breaks the build for me..
> 
> arch/i386/kernel/traps.c: In function 'show_trace_log_lvl':
> arch/i386/kernel/traps.c:195: error: invalid type argument of '->'
> arch/i386/kernel/traps.c:198: error: invalid type argument of '->'
> arch/i386/kernel/traps.c:199: error: invalid type argument of '->'
> make[1]: *** [arch/i386/kernel/traps.o] Error 1
> 
> (The line numbers are different to mainline due to some unrelated
> patches, they point to the UNW_PC/UNW_SP usages),
> 
> 
> Also, shouldn't this..
> 
> 	print_symbol("DWARF2 unwinder stuck at %s\n",
> 		UNW_PC(info.regs));
> 
> be using %p ?

It should be UNWP_PC(&info), just like in the functions above. Here's a
patch:

Signed-off-by: Erik Mouw <erik@...ddisk-recovery.com>

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 3facc8f..017c015 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -190,11 +190,11 @@ static void show_trace_log_lvl(struct ta
 		if (unw_ret > 0 && !arch_unw_user_mode(&info)) {
 #ifdef CONFIG_STACK_UNWIND
 			print_symbol("DWARF2 unwinder stuck at %s\n",
-				     UNW_PC(info.regs));
+				     UNW_PC(&info));
 			if (call_trace == 1) {
 				printk("Leftover inexact backtrace:\n");
-				if (UNW_SP(info.regs))
-					stack = (void *)UNW_SP(info.regs);
+				if (UNW_SP(&info))
+					stack = (void *)UNW_SP(&info);
 			} else if (call_trace > 1)
 				return;
 			else


Erik

-- 
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
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