On 2/10/21 11:19 PM, John Hubbard wrote:
> On 2/5/21 12:41 PM, Joao Martins wrote:
>> Add a unpin_user_page_range_dirty_lock() API which takes a starting page
>> and how many consecutive pages we want to unpin and optionally dirty.
>>
>> To that end, define another iterator for_each_compound_range()
>> that operates in page ranges as opposed to page array.
>>
>> For users (like RDMA mr_dereg) where each sg represents a
>> contiguous set of pages, we're able to more efficiently unpin
>> pages without having to supply an array of pages much of what
>> happens today with unpin_user_pages().
>>
>> Suggested-by: Jason Gunthorpe <j...@nvidia.com>
>> Signed-off-by: Joao Martins <joao.m.mart...@oracle.com>
>> ---
>> include/linux/mm.h | 2 ++
>> mm/gup.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++
>> 2 files changed, 64 insertions(+)
>>
>> diff --git a/include/linux/mm.h b/include/linux/mm.h
>> index a608feb0d42e..b76063f7f18a 100644
>> --- a/include/linux/mm.h
>> +++ b/include/linux/mm.h
>> @@ -1265,6 +1265,8 @@ static inline void put_page(struct page *page)
>> void unpin_user_page(struct page *page);
>> void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
>> bool make_dirty);
>> +void unpin_user_page_range_dirty_lock(struct page *page, unsigned long
>> npages,
>> + bool make_dirty);
>> void unpin_user_pages(struct page **pages, unsigned long npages);
>>
>> /**
>> diff --git a/mm/gup.c b/mm/gup.c
>> index 467a11df216d..938964d31494 100644
>> --- a/mm/gup.c
>> +++ b/mm/gup.c
>> @@ -215,6 +215,32 @@ void unpin_user_page(struct page *page)
>> }
>> EXPORT_SYMBOL(unpin_user_page);
>>
>> +static inline void compound_range_next(unsigned long i, unsigned long
>> npages,
>> + struct page **list, struct page **head,
>> + unsigned int *ntails)
>
> Yes, the new names look good, and I have failed to find any logic errors, so:
>
> Reviewed-by: John Hubbard <jhubb...@nvidia.com>
>
Thanks again for all the input!
