linux-kernel - Re: [PATCH 2/3] kgdb, mips: add arch support for the kernel's kgdb core

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Date:	Fri, 25 Jul 2008 01:27:48 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	jason.wessel@...driver.com
Cc:	linux-kernel@...r.kernel.org, ralf@...ux-mips.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH 2/3] kgdb, mips: add arch support for the kernel's kgdb
 core

On Fri, 18 Jul 2008 12:08:47 -0500, Jason Wessel <jason.wessel@...driver.com> wrote:
> diff --git a/include/asm-mips/kgdb.h b/include/asm-mips/kgdb.h
...
> +static inline void arch_kgdb_breakpoint(void)
> +{
> +	__asm__ __volatile__(
> +		".globl breakinst\n\t"
> +		".set\tnoreorder\n\t"
> +		"nop\n"
> +		"breakinst:\tbreak\n\t"
> +		"nop\n\t"
> +		".set\treorder");
> +}

The gcc might inline kgdb_breakpoint() which includes
arch_kgdb_breakpoint().  I got this error with gcc 4.3.1:

  CC      kernel/kgdb.o
{standard input}: Assembler messages:
{standard input}:809: Error: symbol `breakinst' is already defined
{standard input}:913: Error: symbol `breakinst' is already defined
{standard input}:1233: Error: symbol `breakinst' is already defined

Moving arch_kgdb_breakpoint() into arch/mips/kernel/kgdb.c should
solve the problem.

---
Atsushi Nemoto
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