linux-kernel - Re: [PATCH] arm64: irq: set the correct node for VMAP stack

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Date:   Fri, 17 Nov 2023 10:50:56 +0800
From:   Shijie Huang <shijie@...eremail.onmicrosoft.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Huang Shijie <shijie@...amperecomputing.com>
Cc:     will@...nel.org, gregkh@...uxfoundation.org, rafael@...nel.org,
        arnd@...db.de, mark.rutland@....com, broonie@...nel.org,
        keescook@...omium.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        patches@...erecomputing.com
Subject: Re: [PATCH] arm64: irq: set the correct node for VMAP stack

Hi Catalin,

在 2023/11/17 1:18, Catalin Marinas 写道:
> On Tue, Nov 14, 2023 at 05:16:43PM +0800, Huang Shijie wrote:
>> diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
>> index 6ad5c6ef5329..e62d3cb3f74c 100644
>> --- a/arch/arm64/kernel/irq.c
>> +++ b/arch/arm64/kernel/irq.c
>> @@ -57,7 +57,7 @@ static void init_irq_stacks(void)
>>   	unsigned long *p;
>>   
>>   	for_each_possible_cpu(cpu) {
>> -		p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, cpu_to_node(cpu));
>> +		p = arch_alloc_vmap_stack(IRQ_STACK_SIZE, early_cpu_to_node(cpu));
>>   		per_cpu(irq_stack_ptr, cpu) = p;
>>   	}
>>   }
> This looks alright to me, I don't have a better suggestion. The generic
> code already has the cpu_to_node_map[] array populated by
> early_map_cpu_to_node(), so let's reuse it.
>
>> diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c
>> index eaa31e567d1e..90519d981471 100644
>> --- a/drivers/base/arch_numa.c
>> +++ b/drivers/base/arch_numa.c
>> @@ -144,7 +144,7 @@ void __init early_map_cpu_to_node(unsigned int cpu, int nid)
>>   unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
>>   EXPORT_SYMBOL(__per_cpu_offset);
>>   
>> -static int __init early_cpu_to_node(int cpu)
>> +int early_cpu_to_node(int cpu)
>>   {
>>   	return cpu_to_node_map[cpu];
>>   }
>> diff --git a/include/asm-generic/numa.h b/include/asm-generic/numa.h
>> index 1a3ad6d29833..fc8a9bd6a444 100644
>> --- a/include/asm-generic/numa.h
>> +++ b/include/asm-generic/numa.h
>> @@ -38,6 +38,7 @@ void __init early_map_cpu_to_node(unsigned int cpu, int nid);
>>   void numa_store_cpu_info(unsigned int cpu);
>>   void numa_add_cpu(unsigned int cpu);
>>   void numa_remove_cpu(unsigned int cpu);
>> +int early_cpu_to_node(int cpu);
> Here I'd move this just below early_map_cpu_to_node() and, for
> completeness, also add the dummy static inline for the !NUMA case.

Thanks a lot.  It seems there is no need for me to send the V2 for this.


Thanks

Huang Shijie