sched_setaffinity causing "rq->clock_update_flags < RQCF_ACT_SKIP" warning.

[Dave Jones]

Looks like fallout from cb42c9a3ebbbb23448c3f9a25417fae6309b1a92

WARNING: CPU: 1 PID: 561 at kernel/sched/sched.h:812 set_next_entity+0x11d/0x350
rq->clock_update_flags < RQCF_ACT_SKIP
CPU: 1 PID: 561 Comm: trinity-c36 Not tainted 4.10.0-think+ #6 
Call Trace:
 dump_stack+0x4f/0x73
 __warn+0xcb/0xf0
 warn_slowpath_fmt+0x5f/0x80
 set_next_entity+0x11d/0x350
 set_curr_task_fair+0x2b/0x60
 do_set_cpus_allowed+0x138/0x180
 __set_cpus_allowed_ptr+0x106/0x250
 sched_setaffinity+0x24c/0x2b0
 ? sched_setaffinity+0x5/0x2b0
 SyS_sched_setaffinity+0x7a/0xc0
 do_syscall_64+0x61/0x170
 entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7f461db010f9
RSP: 002b:00007fff76d320a8 EFLAGS: 00000246
 ORIG_RAX: 00000000000000cb
RAX: ffffffffffffffda RBX: 00000000000000cb RCX: 00007f461db010f9
RDX: 00007f461ba30000 RSI: 0000000000001000 RDI: 0000000000000234
RBP: 00007f461e0d4000 R08: 00000000000000a6 R09: 00000000000000cf
R10: fffffffffffffffb R11: 0000000000000246 R12: 0000000000000002
R13: 00007f461e0d4048 R14: 00007f461e1d7ad8 R15: 00007f461e0d4000