linux-next: build warning after merge of the mm tree

Hi all,

After merging the mm tree, today's linux-next build (arm multi_v7_defconfig) produced this warning:

fs/proc/task_mmu.c:2022:13: warning: 'pagemap_scan_backout_range' defined but not used [-Wunused-function]
2022 | static void pagemap_scan_backout_range(struct pagemap_scan_private *p,

      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~

Introduced by commit

93538f467c0f ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs")

Cheers,
Stephen Rothwell