Re: [PATCH v2 07/18] infiniband: set FOLL_PIN, FOLL_LONGTERM via pin_longterm_pages*()

[John Hubbard]

On 11/4/19 12:33 PM, Jason Gunthorpe wrote:
...
>> diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
>> index 24244a2f68cc..c5a78d3e674b 100644
>> +++ b/drivers/infiniband/core/umem.c
>> @@ -272,11 +272,10 @@ struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr,
>>  
>>  	while (npages) {
>>  		down_read(&mm->mmap_sem);
>> -		ret = get_user_pages(cur_base,
>> +		ret = pin_longterm_pages(cur_base,
>>  				     min_t(unsigned long, npages,
>>  					   PAGE_SIZE / sizeof (struct page *)),
>> -				     gup_flags | FOLL_LONGTERM,
>> -				     page_list, NULL);
>> +				     gup_flags, page_list, NULL);
> 
> FWIW, this one should be converted to fast as well, I think we finally
> got rid of all the blockers for that?
> 

I'm not aware of any blockers on the gup.c end, anyway. The only broken thing we
have there is "gup remote + FOLL_LONGTERM". But we can do "gup fast + LONGTERM". 

Unless I'm really missing something, in which case several other call sites
would need changes.

I'll change it to pin_longterm_pages_fast().

thanks,

John Hubbard
NVIDIA