Re: [PATCH v10 05/12] mm: HUGE_VMAP arch support cleanup

Nicholas Piggin
2021-01-24T12:22:32Z

Excerpts from Christoph Hellwig's message of January 24, 2021 9:40 pm:
>> diff --git a/arch/arm64/include/asm/vmalloc.h b/arch/arm64/include/asm/vmalloc.h
>> index 2ca708ab9b20..597b40405319 100644
>> --- a/arch/arm64/include/asm/vmalloc.h
>> +++ b/arch/arm64/include/asm/vmalloc.h
>> @@ -1,4 +1,12 @@
>> #ifndef _ASM_ARM64_VMALLOC_H
>> #define _ASM_ARM64_VMALLOC_H
>>
>> +#include <asm/page.h>
>> +
>> +#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
>> +bool arch_vmap_p4d_supported(pgprot_t prot);
>> +bool arch_vmap_pud_supported(pgprot_t prot);
>> +bool arch_vmap_pmd_supported(pgprot_t prot);
>> +#endif
>
> Shouldn't the be inlines or macros? Also it would be useful
> if the architectures would not have to override all functions
> but just those that are it actually implements?

It gets better in the next patches. I did it this way again to avoid
moving a lot of code at the same time as changing name / prototype
slightly.

I didn't see individual generic fallbacks being all that useful really
at this scale. I don't mind keeping the explicit false.

> Also lots of > 80 char lines in the patch.

Yeah there's a few, I can reduce those.

Thanks,
Nick