linux-kernel - Re: [v5][PATCH 4/6] powerpc/book3e: support kgdb for kernel space

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Date:	Fri, 18 Oct 2013 17:58:39 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Tiejun Chen <tiejun.chen@...driver.com>
CC:	<benh@...nel.crashing.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [v5][PATCH 4/6] powerpc/book3e: support kgdb for kernel space

On Thu, 2013-06-20 at 18:28 +0800, Tiejun Chen wrote:
> Currently we need to skip this for supporting KGDB.

Does it need to depend on CONFIG_KGDB?  Either you've fixed the "can't
quite save properly" part, or you haven't.

-Scott

> 
> Signed-off-by: Tiejun Chen <tiejun.chen@...driver.com>
> ---
>  arch/powerpc/kernel/exceptions-64e.S |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
> index 07cf657..a286b51 100644
> --- a/arch/powerpc/kernel/exceptions-64e.S
> +++ b/arch/powerpc/kernel/exceptions-64e.S
> @@ -639,11 +639,13 @@ kernel_dbg_exc:
>  	rfdi
>  
>  	/* Normal debug exception */
> +1:	andi.	r14,r11,MSR_PR;		/* check for userspace again */
> +#ifndef CONFIG_KGDB
>  	/* XXX We only handle coming from userspace for now since we can't
>  	 *     quite save properly an interrupted kernel state yet
>  	 */
> -1:	andi.	r14,r11,MSR_PR;		/* check for userspace again */
>  	beq	kernel_dbg_exc;		/* if from kernel mode */
> +#endif
>  
>  	/* Now we mash up things to make it look like we are coming on a
>  	 * normal exception



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