[PATCH v1 33/36] mm/gup: drop nth_page() usage in unpin_user_page_range_dirty_lock()

[David Hildenbrand]

On 28.08.25 20:09, Lorenzo Stoakes wrote:
> On Thu, Aug 28, 2025 at 12:01:37AM +0200, David Hildenbrand wrote:
>> There is the concern that unpin_user_page_range_dirty_lock() might do
>> some weird merging of PFN ranges -- either now or in the future -- such
>> that PFN range is contiguous but the page range might not be.
>>
>> Let's sanity-check for that and drop the nth_page() usage.
>>
>> Signed-off-by: David Hildenbrand <david at redhat.com>
> 
> Seems one user uses SG and the other is IOMMU and in each instance you'd
> expect physical contiguity (maybe Jason G. or somebody else more familiar
> with these uses can also chime in).

Right, and I added the sanity-check so we can identify and fix any such 
wrong merging of ranges.

Thanks!

-- 
Cheers

David / dhildenb