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SubjectRe: [PATCH v2] hugetlb: allow to free gigantic pages regardless of the configuration
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On 02/13/2019 08:30 PM, Dave Hansen wrote:
>> -#if (defined(CONFIG_MEMORY_ISOLATION) && defined(CONFIG_COMPACTION)) || defined(CONFIG_CMA)
>> +#ifdef CONFIG_COMPACTION_CORE
>> static __init int gigantic_pages_init(void)
>> {
>> /* With compaction or CMA we can allocate gigantic pages at runtime */
>> diff --git a/fs/Kconfig b/fs/Kconfig
>> index ac474a61be37..8fecd3ea5563 100644
>> --- a/fs/Kconfig
>> +++ b/fs/Kconfig
>> @@ -207,8 +207,9 @@ config HUGETLB_PAGE
>> config MEMFD_CREATE
>> def_bool TMPFS || HUGETLBFS
>>
>> -config ARCH_HAS_GIGANTIC_PAGE
>> +config COMPACTION_CORE
>> bool
>> + default y if (MEMORY_ISOLATION && MIGRATION) || CMA
> This takes a hard dependency (#if) and turns it into a Kconfig *default*
> that can be overridden. That seems like trouble.
>
> Shouldn't it be:
>
> config COMPACTION_CORE
> def_bool y
> depends on (MEMORY_ISOLATION && MIGRATION) || CMA
>
> ?

Thanks for that,

Alex

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