Description: fs/proc: task_mmu.c: don't read mapcount for migration entry
References:
 https://bugzilla.redhat.com/show_bug.cgi?id=2180936
 https://lore.kernel.org/linux-mm/Yg6ac8WlwtnDH6M0@kroah.com/
Notes:
Bugs:
upstream: released (5.17-rc4) [24d7275ce2791829953ed4e72f68277ceb2571c6]
6.1-upstream-stable: N/A "Fixed before branching point"
5.10-upstream-stable: released (5.10.102) [db3f3636e4aed2cba3e4e7897a053323f7a62249]
4.19-upstream-stable: needed
sid: released (5.15.15-1)
6.1-bookworm-security: N/A "Fixed before branch point"
5.10-bullseye-security: released (5.10.103-1)
4.19-buster-security: needed