watchdog: Fix sleeping function called from atomic context

hulk inclusion
category: bugfix
bugzilla: 173968, https://gitee.com/openeuler/kernel/issues/I3J87Y
CVE: NA

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

In '6ab91856 ("watchdog: Fix check_preemption_disabled() error")', we
tried to fix check_preemption_disabled() error by disabling preemption in
hardlockup_detector_perf_init(), but missed that function
perf_event_create_kernel_counter() may sleep.

To fix the issue fully, reimplement hardlockup_detector_perf_init()
through smp_call_on_cpu() instead of disabling preemption.

Fixes: 6ab91856 ("watchdog: Fix check_preemption_disabled() error")
Signed-off-by: NWei Li <liwei391@huawei.com>
Reviewed-by: NCheng Jian <cj.chengjian@huawei.com>
Reviewed-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

kernel/watchdog_hld.c

@@ -499,22 +499,25 @@ void __init hardlockup_detector_perf_restart(void)
 	}
 }
 
-/**
- * hardlockup_detector_perf_init - Probe whether NMI event is available at all
- */
-int __init hardlockup_detector_perf_init(void)
+int __init __hardlockup_detector_perf_init(void *not_used)
 {
-	int ret;
+	int ret = hardlockup_detector_event_create();
 
-	preempt_disable();
-	ret = hardlockup_detector_event_create();
 	if (ret) {
 		pr_info("Perf NMI watchdog permanently disabled\n");
 	} else {
 		perf_event_release_kernel(this_cpu_read(watchdog_ev));
 		this_cpu_write(watchdog_ev, NULL);
 	}
-	preempt_enable();
 	return ret;
 }
+
+/**
+ * hardlockup_detector_perf_init - Probe whether NMI event is available at all
+ */
+int __init hardlockup_detector_perf_init(void)
+{
+	return smp_call_on_cpu(get_boot_cpu_id(),
+				__hardlockup_detector_perf_init, NULL, false);
+}
 #endif /* CONFIG_HARDLOCKUP_DETECTOR_PERF */