Hi Binoy,

[auto build test WARNING on tip/perf/core]
[also build test WARNING on v4.8-rc3 next-20160824]
[if your patch is applied to the wrong git tree, please drop us a note to help 
improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for 
convenience) to record what (public, well-known) commit your patch series was 
built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    
https://github.com/0day-ci/linux/commits/Binoy-Jayan/tracing-Deference-pointers-without-RCU-checks/20160824-192127
config: tile-allyesconfig (attached as .config)
compiler: tilegx-linux-gcc (GCC) 4.6.2
reproduce:
        wget 
https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
 -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=tile 

All warnings (new ones prefixed by >>):

   kernel/trace/trace_irqsoff.c: In function 'stop_critical_timings':
>> kernel/trace/trace_irqsoff.c:454:4: warning: passing argument 1 of 
>> 'get_delta' from incompatible pointer type [enabled by default]
   kernel/trace/trace_irqsoff.c:430:23: note: expected 'cycle_t *' but argument 
is of type 'cycle_t *'
   kernel/trace/trace_irqsoff.c: In function 'time_hardirqs_on':
   kernel/trace/trace_irqsoff.c:466:4: warning: passing argument 1 of 
'get_delta' from incompatible pointer type [enabled by default]
   kernel/trace/trace_irqsoff.c:430:23: note: expected 'cycle_t *' but argument 
is of type 'cycle_t *'

vim +/get_delta +454 kernel/trace/trace_irqsoff.c

   438                  this_cpu_write(ts_critical_timings,
   439                          (cycle_t) trace_clock_local());
   440  
   441          if (preempt_trace() || irq_trace())
   442                  start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
   443  }
   444  EXPORT_SYMBOL_GPL(start_critical_timings);
   445  
   446  void stop_critical_timings(void)
   447  {
   448          if (preempt_trace() || irq_trace())
   449                  stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
   450  
   451          if (trace_latency_critical_timings_enabled()) {
   452                  trace_latency_critical_timings(
   453                          raw_smp_processor_id(),
 > 454                          get_delta(&ts_critical_timings));
   455          }
   456  
   457  }
   458  EXPORT_SYMBOL_GPL(stop_critical_timings);
   459  
   460  #ifdef CONFIG_IRQSOFF_TRACER
   461  #ifdef CONFIG_PROVE_LOCKING
   462  void time_hardirqs_on(unsigned long a0, unsigned long a1)

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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