Hi Joel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc5 next-20180314]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Joel-Fernandes/tracing-Improve-design-of-preemptirq-tracepoints-and-its-users/20180316-012211
config: i386-randconfig-a1-201810 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/locking/lockdep.c: In function 'lockdep_init':
>> kernel/locking/lockdep.c:4325:2: error: implicit declaration of function 'register_trace_irq_disable' [-Werror=implicit-function-declaration]
     register_trace_irq_disable(lockdep_hardirqs_off, NULL);
     ^
>> kernel/locking/lockdep.c:4326:2: error: implicit declaration of function 'register_trace_irq_enable' [-Werror=implicit-function-declaration]
     register_trace_irq_enable(lockdep_hardirqs_on, NULL);
     ^
   cc1: some warnings being treated as errors

vim +/register_trace_irq_disable +4325 kernel/locking/lockdep.c

  4321	
  4322	void __init lockdep_init(void)
  4323	{
  4324	#ifdef CONFIG_PROVE_LOCKING
> 4325		register_trace_irq_disable(lockdep_hardirqs_off, NULL);
> 4326		register_trace_irq_enable(lockdep_hardirqs_on, NULL);
  4327	#endif
  4328		printk("Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar\n");
  4329	
  4330		printk("... MAX_LOCKDEP_SUBCLASSES:  %lu\n", MAX_LOCKDEP_SUBCLASSES);
  4331		printk("... MAX_LOCK_DEPTH:          %lu\n", MAX_LOCK_DEPTH);
  4332		printk("... MAX_LOCKDEP_KEYS:        %lu\n", MAX_LOCKDEP_KEYS);
  4333		printk("... CLASSHASH_SIZE:          %lu\n", CLASSHASH_SIZE);
  4334		printk("... MAX_LOCKDEP_ENTRIES:     %lu\n", MAX_LOCKDEP_ENTRIES);
  4335		printk("... MAX_LOCKDEP_CHAINS:      %lu\n", MAX_LOCKDEP_CHAINS);
  4336		printk("... CHAINHASH_SIZE:          %lu\n", CHAINHASH_SIZE);
  4337	
  4338		printk(" memory used by lock dependency info: %lu kB\n",
  4339			(sizeof(struct lock_class) * MAX_LOCKDEP_KEYS +
  4340			sizeof(struct list_head) * CLASSHASH_SIZE +
  4341			sizeof(struct lock_list) * MAX_LOCKDEP_ENTRIES +
  4342			sizeof(struct lock_chain) * MAX_LOCKDEP_CHAINS +
  4343			sizeof(struct list_head) * CHAINHASH_SIZE
  4344	#ifdef CONFIG_PROVE_LOCKING
  4345			+ sizeof(struct circular_queue)
  4346	#endif
  4347			) / 1024
  4348			);
  4349	
  4350		printk(" per task-struct memory footprint: %lu bytes\n",
  4351			sizeof(struct held_lock) * MAX_LOCK_DEPTH);
  4352	}
  4353	

---
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