linux-kernel - Re: [PATCH 4/4] arm64: kgdb: Set PSTATE.SS to 1 to reenable single-step

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Date:   Sat, 16 May 2020 16:20:44 +0800
From:   "liwei (GF)" <liwei391@...wei.com>
To:     Doug Anderson <dianders@...omium.org>
CC:     Daniel Thompson <daniel.thompson@...aro.org>,
        Jason Wessel <jason.wessel@...driver.com>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Miller <davem@...emloft.net>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>, <liwei1412@....com>
Subject: Re: [PATCH 4/4] arm64: kgdb: Set PSTATE.SS to 1 to reenable
 single-step

Hi Douglas,

On 2020/5/14 8:23, Doug Anderson wrote:
(SNIP)
>> diff --git a/arch/arm64/kernel/kgdb.c b/arch/arm64/kernel/kgdb.c
>> index 3910ac06c261..093ad9d2e5e6 100644
>> --- a/arch/arm64/kernel/kgdb.c
>> +++ b/arch/arm64/kernel/kgdb.c
>> @@ -230,7 +230,8 @@ int kgdb_arch_handle_exception(int exception_vector, int signo,
>>                         kernel_prepare_single_step(&per_cpu(kgdb_ss_flags,
>>                                         raw_smp_processor_id()), linux_regs);
>>                         kernel_enable_single_step(linux_regs);
>> -               }
>> +               } else
>> +                       set_regs_spsr_ss(linux_regs);
> 
> One slight nit is that my personal preference is that if one half of
> an "if/else" needs braces then both halves should have braces.  I
Thanks for spotting it. Refer to Documentation/process/coding-style.rst,
i will fix it in the v2.

> don't know what Catalin and Will's policies are, though.
> 
> Other than that, this seems right to me.  I will leave it to the
> Catalin and Will folks to say if they'd rather have this call made
> from a different place or if they're happy with where you've put it.
> 
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Tested-by: Douglas Anderson <dianders@...omium.org>
> 

Thanks,
Wei