On 9/19/19 8:26 PM, Ben Hutchings wrote:
On Mon, 2019-08-19 at 18:58 +0100, Vlastimil Babka wrote:
[...]
Hi, I'm sending this stable-only patch for consideration because it's probably
unrealistic to backport the 4.13 switch to generic GUP. I can look at 4.4 and
3.16 if accepted. The RCU page table freeing could be also considered.
I would be interested in backports for 3.16 and 4.4.
Note the patch also includes page refcount protection. I found out that
8fde12ca79af ("mm: prevent get_user_pages() from overflowing page refcount")
backport to 4.9 missed the arch-specific gup implementations:
https://lore.kernel.org/lkml/6650323f-dbc9-f069-000b-f6b0f941a065@xxxxxxx/
[...]
I suppose that still needs to be addressed for 4.9, right?
Yeah, I'll take a look, thanks for reminding.
Ben.
