linux-kernel - Re: [PATCH 10/15] powerpc: Replace hardcoded offset by BREAK_INSTR

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Date:	Sat, 31 Jul 2010 09:44:23 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	linux-kernel@...r.kernel.org, kgdb-bugreport@...ts.sourceforge.net,
	mingo@...e.hu, Michal Simek <monstr@...str.eu>,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 10/15] powerpc: Replace hardcoded offset by
 BREAK_INSTR_SIZE

On Fri, 2010-07-30 at 14:17 -0500, Jason Wessel wrote:
> From: Michal Simek <monstr@...str.eu>
> 
> kgdb_handle_breakpoint checks the first arch_kgdb_breakpoint
> which is not known by gdb that's why is necessary jump over
> it. The jump lenght is equal to BREAK_INSTR_SIZE that's
> why is cleaner to use defined macro instead of hardcoded
> non-described offset.

Yeah well, all powerpc instructions are 4 bytes :-) But the
patch is fine.

> Signed-off-by: Michal Simek <monstr@...str.eu>
> Signed-off-by: Jason Wessel <jason.wessel@...driver.com>

Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: linuxppc-dev@...abs.org
> ---
>  arch/powerpc/kernel/kgdb.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
> index 82a7b22..7f61a3a 100644
> --- a/arch/powerpc/kernel/kgdb.c
> +++ b/arch/powerpc/kernel/kgdb.c
> @@ -129,7 +129,7 @@ static int kgdb_handle_breakpoint(struct pt_regs *regs)
>  		return 0;
>  
>  	if (*(u32 *) (regs->nip) == *(u32 *) (&arch_kgdb_ops.gdb_bpt_instr))
> -		regs->nip += 4;
> +		regs->nip += BREAK_INSTR_SIZE;
>  
>  	return 1;
>  }


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