Re: [PATCH] mm/hugetlb: Fix build failure with HUGETLB_PAGE but not HUGEBTLBFS

[Mike Kravetz]

On 3/17/20 1:43 AM, Christophe Leroy wrote:
> 
> 
> Le 17/03/2020 Ã 09:25, Baoquan He a Ãcrit :
>> On 03/17/20 at 08:04am, Christophe Leroy wrote:
>>> When CONFIG_HUGETLB_PAGE is set but not CONFIG_HUGETLBFS, the
>>> following build failure is encoutered:
>>
>>  From the definition of HUGETLB_PAGE, isn't it relying on HUGETLBFS?
>> I could misunderstand the def_bool, please correct me if I am wrong.
> 
> AFAIU, it means that HUGETLBFS rely on HUGETLB_PAGE, by default HUGETLB_PAGE is not selected when HUGETLBFS is not. But it is still possible for an arch to select HUGETLB_PAGE without selecting HUGETLBFS when it uses huge pages for other purpose than hugetlb file system.
> 

Hi Christophe,

Do you actually have a use case/example of using hugetlb pages without
hugetlbfs?  I can understand that there are some use cases which never
use the filesystem interface.  However, hugetlb support is so intertwined
with hugetlbfs, I am thinking there would be issues trying to use them
separately.  I will look into this further.

-- 
Mike Kravetz