--- zzzz-none-000/linux-4.1.52/kernel/time/timer.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/kernel/time/timer.c	2022-03-02 11:37:13.000000000 +0000
@@ -42,6 +42,9 @@
 #include <linux/sched/sysctl.h>
 #include <linux/slab.h>
 #include <linux/compat.h>
+#if defined(CONFIG_AVM_SIMPLE_PROFILING)
+#include <avm/profile/profile.h>
+#endif /*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING) ---*/
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -1216,13 +1219,27 @@
 			base->running_timer = timer;
 			detach_expired_timer(timer, base);
 
+			if (fn == NULL) pr_warn("timer callback NULL %pS %08lx\n", timer, data);
+
 			if (irqsafe) {
 				spin_unlock(&base->lock);
+#if defined(CONFIG_AVM_SIMPLE_PROFILING)
+				avm_simple_profiling_log(avm_profile_data_type_timer_begin, (unsigned int)fn, (unsigned int)data);
+#endif /*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING) ---*/
 				call_timer_fn(timer, fn, data);
+#if defined(CONFIG_AVM_SIMPLE_PROFILING)
+				avm_simple_profiling_log(avm_profile_data_type_timer_end, (unsigned int)fn, (unsigned int)data);
+#endif /*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING) ---*/
 				spin_lock(&base->lock);
 			} else {
 				spin_unlock_irq(&base->lock);
+#if defined(CONFIG_AVM_SIMPLE_PROFILING)
+				avm_simple_profiling_log(avm_profile_data_type_timer_begin, (unsigned int)fn, (unsigned int)data);
+#endif /*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING) ---*/
 				call_timer_fn(timer, fn, data);
+#if defined(CONFIG_AVM_SIMPLE_PROFILING)
+				avm_simple_profiling_log(avm_profile_data_type_timer_end, (unsigned int)fn, (unsigned int)data);
+#endif /*--- #if defined(CONFIG_AVM_SIMPLE_PROFILING) ---*/
 				spin_lock_irq(&base->lock);
 			}
 		}