linux-kernel - Re: [v1 PATCH 4/4] RISC-V: Support nr

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Date:   Tue, 19 Mar 2019 18:29:23 -0700
From:   Atish Patra <atish.patra@....com>
To:     Damien Le Moal <Damien.LeMoal@....com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>
Cc:     Albert Ou <aou@...s.berkeley.edu>, Andreas Schwab <schwab@...e.de>,
        Anup Patel <anup@...infault.org>,
        Dmitriy Cherkasov <dmitriy@...-tech.org>,
        Johan Hovold <johan@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Anup Patel <Anup.Patel@....com>
Subject: Re: [v1 PATCH 4/4] RISC-V: Support nr_cpus command line option.

On 3/19/19 4:58 PM, Damien Le Moal wrote:
> On 2019/03/20 8:56, Damien Le Moal wrote:
>> On 2019/03/20 7:20, Atish Patra wrote:
>>> If nr_cpus command line option is set, maximum possible cpu should be
>>> set to that value.
>>>
>>> Signed-off-by: Atish Patra <atish.patra@....com>
>>> ---
>>>   arch/riscv/kernel/smpboot.c | 10 +++++++++-
>>>   1 file changed, 9 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
>>> index 609475c5..a8fe590c 100644
>>> --- a/arch/riscv/kernel/smpboot.c
>>> +++ b/arch/riscv/kernel/smpboot.c
>>> @@ -86,11 +86,19 @@ void __init setup_smp(void)
>>>   		}
>>>   
>>>   		cpuid_to_hartid_map(cpuid) = hart;
>>> -		set_cpu_possible(cpuid, true);
>>
>> This looks weird: the code being changed does not match what patch 3/4 did.
> 
> Arg... Ignore this one. My bad. Morning here, I need more coffee :)
> 
:).

>>
>>>   		cpuid++;
>>>   	}
>>>   
>>>   	BUG_ON(!found_boot_cpu);
>>> +
>>> +	if (cpuid > nr_cpu_ids)
>>> +		pr_warn("Total number of cpus [%d] are greater than configured via nr_cpus [%d]\n",
>>
>> "The total number of cpus [%d] is greater than nr_cpus option value [%d]\n"
>>

ok. I will fix it in v2.

Regards,
Atish
>>> +			cpuid, nr_cpu_ids);
>>> +
>>> +	for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
>>> +		if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID)
>>> +			set_cpu_possible(cpuid, true);
>>> +	}
>>>   }
>>>   
>>>   int __cpu_up(unsigned int cpu, struct task_struct *tidle)
>>>
>>
>>
> 
>