kernel/events/ring_buffer.c:22:47: sparse: sparse: incorrect type in argument 2 (different base types)

kernel/events/ring_buffer.c:22:47: sparse: sparse: incorrect type in argument 2 (different base types)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   113ae7b4decc6c2d95bdbbe52e615a0137ef7f9f
commit: c96fff391c095c11dc87dab35be72dee7d217cde perf/ring_buffer: Allow the EPOLLRDNORM flag for poll
date:   1 year ago
config: arc-randconfig-r122-20260322 (https://download.01.org/0day-ci/archive/20260322/202603222340.Ikvqm7r6-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 10.5.0
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260322/202603222340.Ikvqm7r6-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603222340.Ikvqm7r6-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> kernel/events/ring_buffer.c:22:47: sparse: sparse: incorrect type in argument 2 (different base types) @@     expected int i @@     got restricted __poll_t @@
   kernel/events/ring_buffer.c:22:47: sparse:     expected int i
   kernel/events/ring_buffer.c:22:47: sparse:     got restricted __poll_t
   kernel/events/ring_buffer.c:174:14: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/events/ring_buffer.c:174:14: sparse:    struct perf_buffer [noderef] __rcu *
   kernel/events/ring_buffer.c:174:14: sparse:    struct perf_buffer *
   kernel/events/ring_buffer.c:174:14: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/events/ring_buffer.c:174:14: sparse:    struct perf_buffer [noderef] __rcu *
   kernel/events/ring_buffer.c:174:14: sparse:    struct perf_buffer *
   kernel/events/ring_buffer.c:174:14: sparse: sparse: incompatible types in comparison expression (different address spaces):
   kernel/events/ring_buffer.c:174:14: sparse:    struct perf_buffer [noderef] __rcu *
   kernel/events/ring_buffer.c:174:14: sparse:    struct perf_buffer *

vim +22 kernel/events/ring_buffer.c

    19	
    20	static void perf_output_wakeup(struct perf_output_handle *handle)
    21	{
  > 22		atomic_set(&handle->rb->poll, EPOLLIN | EPOLLRDNORM);
    23	
    24		handle->event->pending_wakeup = 1;
    25	
    26		if (*perf_event_fasync(handle->event) && !handle->event->pending_kill)
    27			handle->event->pending_kill = POLL_IN;
    28	
    29		irq_work_queue(&handle->event->pending_irq);
    30	}
    31	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki