Re: [PATCH -next] arm64: Export __cpu_logical_map

Kefeng Wang
2020-07-24T09:18:25Z

On 2020/7/24 16:16, Anshuman Khandual wrote:
> On 07/24/2020 08:38 AM, Kefeng Wang wrote:
>> +maillist
> This does not seem to be a correct method of posting any patch.
sorry， forget to cc mailist when git send-email
>> On 2020/7/24 11:04, Kefeng Wang wrote:
>>> ERROR: modpost: "__cpu_logical_map" [drivers/cpufreq/tegra194-cpufreq.ko] undefined!
>
>>> ARM64 tegra194-cpufreq driver use cpu_logical_map, export
>>> __cpu_logical_map to fix build issue.
> Commit 887d5fc82cb4 ("cpufreq: Add Tegra194 cpufreq driver") which adds
> this particular driver is present just on linux-next. But as expected,
> the driver does not use __cpu_logical_map directly but instead accesses
> it via cpu_logical_map() wrapper. Wondering, how did you even trigger
> the modpost error ?

arch/arm64/include/asm/smp.h:#define cpu_logical_map(cpu)
__cpu_logical_map[cpu]

Will see the error when using allmodconfig to build.

>
>>> Reported-by: Hulk Robot <hulkci@huawei.com>
>>> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
>>> ---
>>>   arch/arm64/kernel/setup.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
>>> index c793276ec7ad9..3aea05fbb9998 100644
>>> --- a/arch/arm64/kernel/setup.c
>>> +++ b/arch/arm64/kernel/setup.c
>>> @@ -275,6 +275,7 @@ static int __init reserve_memblock_reserved_regions(void)
>>>   arch_initcall(reserve_memblock_reserved_regions);
>>>     u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
>>> +EXPORT_SYMBOL(__cpu_logical_map);
>>>     void __init setup_arch(char **cmdline_p)
>>>   {
>>
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> .