[PATCH] powerpc/hugetlbfs: Export HPAGE_SHIFT

[Oliver]

On Fri, Jun 30, 2017 at 7:28 PM, Anshuman Khandual
<khandual at linux.vnet.ibm.com> wrote:
> On 06/30/2017 12:22 PM, Oliver O'Halloran wrote:
>> Export it so it can be referenced inside a module.
>>
>> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
>> ---
>>  arch/powerpc/mm/hugetlbpage.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
>> index ceeab69cf7fc..96293560f294 100644
>> --- a/arch/powerpc/mm/hugetlbpage.c
>> +++ b/arch/powerpc/mm/hugetlbpage.c
>> @@ -34,6 +34,7 @@
>>  #define PAGE_SHIFT_16G       34
>>
>>  unsigned int HPAGE_SHIFT;
>> +EXPORT_SYMBOL(HPAGE_SHIFT);
>
> Why would you need this in a driver ? This represents the
> default HugeTLB page size.

Libnvdimm uses HPAGE_SIZE for a few things that it probably shouldn't.
I have sent a fix for libnvdimm, but that hasn't been merged yet and
this was breaking mpe's -next builds in the mean time. I agree it's
kind of bad, but we needed ZONE_DEVICE support to be in 4.13.

Oliver