linux-kernel - Re: [PATCH] MIPS: KGDB: fix kgdb support for SMP platforms.

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Message-ID: <20190328070629.uw4ybmecz47h7uje@holly.lan>
Date:   Thu, 28 Mar 2019 07:06:29 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Chong Qiao <qiaochong@...ngson.cn>
Cc:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Will Deacon <will.deacon@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] MIPS: KGDB: fix kgdb support for SMP platforms.

On Thu, Mar 28, 2019 at 07:08:01AM +0800, Chong Qiao wrote:
> KGDB_call_nmi_hook is called by other cpu through smp call.
> MIPS smp call is processed in ipi irq handler and regs is saved in
>  handle_int.
> So kgdb_call_nmi_hook get regs by get_irq_regs and regs will be passed
>  to kgdb_cpu_enter.
> 
> Signed-off-by: Chong Qiao <qiaochong@...ngson.cn>

Acked-by: Daniel Thompson <daniel.thompson@...aro.org>


> ---
>  arch/mips/kernel/kgdb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/mips/kernel/kgdb.c b/arch/mips/kernel/kgdb.c
> index 6e574c02e4c3b..ea781b29f7f17 100644
> --- a/arch/mips/kernel/kgdb.c
> +++ b/arch/mips/kernel/kgdb.c
> @@ -33,6 +33,7 @@
>  #include <asm/processor.h>
>  #include <asm/sigcontext.h>
>  #include <linux/uaccess.h>
> +#include <asm/irq_regs.h>
>  
>  static struct hard_trap_info {
>  	unsigned char tt;	/* Trap type code for MIPS R3xxx and R4xxx */
> @@ -214,7 +215,7 @@ void kgdb_call_nmi_hook(void *ignored)
>  	old_fs = get_fs();
>  	set_fs(KERNEL_DS);
>  
> -	kgdb_nmicallback(raw_smp_processor_id(), NULL);
> +	kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
>  
>  	set_fs(old_fs);
>  }
> -- 
> 2.17.0
> 
>