arm64: Fix the ipi backtrace warning when softlockup

hulk inclusion
category: bugfix
bugzilla: 187431, https://gitee.com/openeuler/kernel/issues/I5ZUTK



--------------------------------

f86d165b ("arm64: Add non nmi ipi backtrace support")
introduced the IPI backtrace support on arm64 with NMI unsupported.

However a warning message comes when triggering the non-NMI
IPI backtrace:

WARNING: CPU: 6 PID: 1121 at kernel/smp.c:680 smp_call_function_many_cond+0x78/0x3dc
Modules linked in: soft_lockup_test(OE) [last unloaded: soft_lockup_test]
CPU: 6 PID: 1121 Comm: loop_thread Tainted: G           OEL    5.10.0+ #9
Hardware name: linux,dummy-virt (DT)
pstate: 40000085 (nZcv daIf -PAN -UAO -TCO BTYPE=--)
pc : smp_call_function_many_cond+0x78/0x3dc
lr : smp_call_function_many+0x40/0x50
sp : ffffffc010033c10
x29: ffffffc010033c10 x28: 0000000000000000
x27: ffffffd5dfe2a9a8 x26: ffffffa9bfdb4430
x25: 0000000000000000 x24: 0000000000000000
x23: ffffffd5dfe29000 x22: 0000000000000000
x21: 0000000000000006 x20: ffffffd5df216418
x19: ffffffd5dfe2a9a8 x18: 0000000000000000
x17: 0000000000000000 x16: ffffffd5df293d78
x15: 0000000000000000 x14: 0000000000000000
x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000000000
x9 : 0025001680000006 x8 : 4e4d492066726f6d
x7 : 53656e64696e6720 x6 : 0000000000000001
x5 : ffffffa9bfdb0750 x4 : 0000000000000000
x3 : 0000000000000000 x2 : ffffffd3e01ab000
x1 : ffffffd5dfc03000 x0 : 0000000000010000
Call trace:
 smp_call_function_many_cond+0x78/0x3dc
 smp_call_function_many+0x40/0x50
 arm64_send_ipi+0x30/0x3c
 nmi_trigger_cpumask_backtrace+0xfc/0x154
 arch_trigger_cpumask_backtrace+0x3c/0x58
 watchdog_timer_fn+0x1d4/0x220
 __hrtimer_run_queues+0x1bc/0x2c8
 hrtimer_run_queues+0xe4/0x110
 run_local_timers+0x24/0x50
 update_process_times+0x5c/0x88
 tick_periodic+0xd0/0xec
 tick_handle_periodic+0x38/0x8c
 arch_timer_handler_virt+0x38/0x50
 handle_percpu_devid_irq+0xe0/0x1e0
 generic_handle_irq+0x34/0x4c
 __handle_domain_irq+0xb0/0xb8
 gic_handle_irq+0x98/0xb8
 el1_irq+0xa8/0x140
 loop_func+0x14/0x28 [soft_lockup_test]
 kthread+0x120/0x130
 ret_from_fork+0x10/0x18

The cause is calling smp_call_function_many to send IPI to other CPUs
in a softirq handling context, which is unsafe and may lead to deadlock.

Use smp_call_function_single_async() instead to avoid the warning above.

Fixes: f86d165b ("arm64: Add non nmi ipi backtrace support")
Signed-off-by: Chen Jiahao <chenjiahao16@huawei.com>
Reviewed-by: Zhang Jianhua <chris.zjh@huawei.com>
Reviewed-by: Liao Chang <liaochang1@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>