Re: [paulmckrcu:non-rcu/next 39/40] include/linux/hrtimer.h:355:16: sparse: sparse: incorrect type in return expression (different modifiers)

On Thu, Aug 13, 2026 at 01:39:51PM +0800, kernel test robot wrote:
> tree:   https://github.com/paulmckrcu/linux non-rcu/next
> head:   e39a12053df0951120ff6283177e0d5179feda45
> commit: c3d1cae06fc1ad9b6948fa0ca8a93415607ea8b1 [39/40] hrtimer: Mark the hrtimer_sleeper structure's ->task field __private
> config: arc-randconfig-r132-20260813 (https://download.01.org/0day-ci/archive/20260813/[email protected]/config)
> compiler: arc-linux-gcc (GCC) 13.4.0
> sparse: v0.6.5-rc1
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260813/[email protected]/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 <[email protected]>
> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
> 
> sparse warnings: (new ones prefixed by >>)
>    kernel/time/sleep_timeout.c: note: in included file (through include/linux/alarmtimer.h, include/linux/posix-timers.h, include/linux/sched/signal.h):
> >> include/linux/hrtimer.h:355:16: sparse: sparse: incorrect type in return expression (different modifiers) @@     expected struct task_struct * @@     got struct task_struct [noderef] * @@

Thank you for the testing!

Does the patch below clear things up for you?

							Thanx, Paul

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

commit 6597c140656fe857a51debfd684e66e09636fa45
Author: Paul E. McKenney <[email protected]>
Date:   Tue Aug 18 16:17:47 2026 -0700

    squash! hrtimer: Mark the hrtimer_sleeper structure's ->task field __private
    
    [ paulmck: Apply kernel test robot feedback. ]
    
    Signed-off-by: Paul E. McKenney <[email protected]>

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 5c04423e8e900b..b919ee508fb494 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -73,7 +73,7 @@ enum hrtimer_mode {
  */
 struct hrtimer_sleeper {
 	struct hrtimer timer;
-	struct task_struct __private *task;
+	struct task_struct *__private task;
 };
 
 static inline void hrtimer_set_expires(struct hrtimer *timer, ktime_t time)