linux-kernel - Re: [PATCH v1 2/4] LoongArch: Handle percpu handler address in bt

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Message-ID: <2a090dd9-3a24-236f-2a72-19d8567568c7@loongson.cn>
Date: Tue, 20 Jan 2026 20:57:13 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/4] LoongArch: Handle percpu handler address in
 bt_address()

On 2026/1/20 下午8:04, Huacai Chen wrote:
> Hi, Tiezhu,
> 
> On Tue, Jan 20, 2026 at 5:23 PM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>>
>> After commit 4cd641a79e69 ("LoongArch: Remove unnecessary checks for
>> ORC unwinder"), the system can not boot normally under some configs,
>> there are many error messages "cannot find unwind pc at".

...

>> +#if defined(CONFIG_NUMA) && !defined(CONFIG_PREEMPT_RT)
>> +       for (int cpu = 1; cpu < num_possible_cpus(); cpu++) {
> Use nr_cpu_ids instead of num_possible_cpus() can improve performance a little.
> 
>> +               int vec_sz = sizeof(exception_handlers);
>> +
> It is better to add "if (!pcpu_handlers[cpu]) continue" here.

If so, it can use for_each_possible_cpu(cpu) directly?

Thanks,
Tiezhu