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

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Date:   Thu, 28 Mar 2019 06:25:33 +0800 (GMT+08:00)
From:   qiaochong <qiaochong@...ngson.cn>
To:     "Doug Anderson" <dianders@...omium.org>
Cc:     "Ralf Baechle" <ralf@...ux-mips.org>,
        "Paul Burton" <paul.burton@...s.com>,
        "James Hogan" <jhogan@...nel.org>,
        "Daniel Thompson" <daniel.thompson@...aro.org>,
        "Will Deacon" <will.deacon@....com>,
        "Christophe Leroy" <christophe.leroy@....fr>,
        linux-mips <linux-mips@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re:Re: [PATCH] MIPS: KGDB: fix kgdb support for SMP platforms.


My name  is QiaoChong， which is same to my username.
Qiao is my family name.
Thanks a lot.

在 2019-03-28 00:25:06，"Doug Anderson" <dianders@...omium.org> 写道：

>Hi,
>
>On Wed, Mar 27, 2019 at 8:06 AM qiaochong <qiaochong@...ngson.cn> 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: qiaochong <qiaochong@...ngson.cn>
>
>Note that you might want to adjust your git settings.  Usually in the
>kernel they require that a Signed-off-by have your real name, not just
>your username.  You probably need to spin your patch to fix this.  You
>should make sure that the authorship of the patch also has your real
>name.
>
>
>> ---
>>  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);
>>  }
>
>As per my reply on V1, feel free to add:
>
>Reviewed-by: Douglas Anderson <dianders@...omium.org>


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