linux-kernel - Re: [PATCH v2 7/8] RISC-V: Check and continue in case of an invalid cpuid.

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Message-ID: <a92933c7-c489-04a9-5b21-ed78aac927ec@wdc.com>
Date:   Thu, 17 Jan 2019 18:10:40 -0800
From:   Atish Patra <atish.patra@....com>
To:     Anup Patel <anup@...infault.org>
Cc:     "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        Alan Kao <alankao@...estech.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andreas Schwab <schwab@...e.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Dmitriy Cherkasov <dmitriy@...-tech.org>,
        Jason Cooper <jason@...edaemon.net>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Michael Clark <michaeljclark@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Patrick Stählin <me@...ki.ch>,
        Thomas Gleixner <tglx@...utronix.de>,
        Zong Li <zongbox@...il.com>
Subject: Re: [PATCH v2 7/8] RISC-V: Check and continue in case of an invalid
 cpuid.

On 1/8/19 4:00 AM, Anup Patel wrote:
> Prefer, commit prefix "irqchip/irq-sifive-plic:" instead of "RISC-V:"
> 

Will do.

Regards,
Atish
> On Tue, Jan 8, 2019 at 3:08 PM Atish Patra <atish.patra@....com> wrote:
>>
>> riscv_hartid_to_cpuid can return invalid cpuid for a hart
>> that is present in DT but was never brought up.
>>
>> Print the appropriate warning message and continue.
>>
>> Signed-off-by: Atish Patra <atish.patra@....com>
>> ---
>>   drivers/irqchip/irq-sifive-plic.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
>> index 357e9daf..254ecd76 100644
>> --- a/drivers/irqchip/irq-sifive-plic.c
>> +++ b/drivers/irqchip/irq-sifive-plic.c
>> @@ -237,6 +237,11 @@ static int __init plic_init(struct device_node *node,
>>                  }
>>
>>                  cpu = riscv_hartid_to_cpuid(hartid);
>> +               if (cpu < 0) {
>> +                       pr_warn("Invalid cpuid for context %d\n", i);
>> +                       continue;
>> +               }
>> +
>>                  handler = per_cpu_ptr(&plic_handlers, cpu);
>>                  handler->present = true;
>>                  handler->ctxid = i;
>> --
>> 2.7.4
>>
> 
> Otherwise, looks good to me.
> 
> Reviewed-by: Anup Patel <anup@...infault.org>
> 
> Regards,
> Anup
>