Bug: RTA property delay_s will cause kernel segmentation fault

Created by: cloverpop

rt-app workload with delay_s property triggers kernel fault immediately.

[28081.878055] delay_starter_1[4059]: unhandled level 0 translation fault (11) at 0x5f746c74 [28081.895414] pgd = ffffffc0b5e9b000 [28081.898809] [5f746c75616665] *pgd=0000000000000000, *pud=0000000000000000 [28081.905976] [28081.907552] CPU: 5 PID: 4059 Comm: delay_starter_1 Not tainted 4.4.77-g576a011-dirty #1 [28081.915561] Hardware name: HiKey960 (DT) [28081.919485] task: ffffffc0787ce080 ti: ffffffc094944000 task.ti: ffffffc094944000 [28081.926973] PC is at 0x43c6c4 [28081.929941] LR is at 0x4028b4 [28081.932904] pc : [<000000000043c6c4>] lr : [<00000000004028b4>] pstate: 00000000 [28081.940298] sp : 0000007fb7ffd610 [28081.943608] x29: 0000007fb7ffd610 x28: 00000000004b16f0 [28081.948925] x27: 0000007fb7ffe0a0 x26: 00000000004af000 [28081.954239] x25: 0000000000402ca8 x24: 00000000004a9000 [28081.959560] x23: 00000000004a8000 x22: 0000007ffffff65f [28081.964877] x21: 0000000000000000 x20: 0000000000000000 [28081.970191] x19: 00000000004a84a0 x18: 0000000000000000 [28081.975512] x17: 00000000004a9000 x16: 0000000000000000 [28081.980828] x15: ffffffffffffffff x14: 0000000000000001 [28081.986141] x13: 0000000000000010 x12: 0101010101010101 [28081.991464] x11: 7f7f7f7f7f7f7f7f x10: fefefefefeff5c1f [28081.996780] x9 : ffffffffffffffff x8 : 705f7413d1617eb5 [28082.002095] x7 : 0000808080808080 x6 : 0000007fa400190a [28082.007417] x5 : ffffffffffffffff x4 : 0000000000005d20 [28082.012733] x3 : 705f746c75616665 x2 : 000000000000007f [28082.018048] x1 : 0000007fa40018d0 x0 : 705f746c75616665