* [paulmckrcu:dev.2026.09.09a 42/56] kernel/rcu/tree_stall.h:332:48: warning: comparison between pointer and integer ('int' and 'struct task_struct *')
@ 2026-09-11 16:28 kernel test robot
2026-09-11 17:10 ` Paul E. McKenney
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-09-11 16:28 UTC (permalink / raw)
To: Paul E. McKenney; +Cc: llvm, oe-kbuild-all
tree: https://github.com/paulmckrcu/linux dev.2026.09.09a
head: d61d9b5dd56c6cf72b70bb5fb52b213ead9f7765
commit: e33488c41be623f7c7ef5b8763e20c45f1364d1c [42/56] rcu: Add running and boosted indications to RCU task stall dump
config: powerpc-tqm8xx_defconfig (https://download.01.org/0day-ci/archive/20260912/202609120047.u7Af769s-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260912/202609120047.u7Af769s-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/202609120047.u7Af769s-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from kernel/rcu/tree.c:5112:
kernel/rcu/tree_stall.h:332:8: error: call to undeclared function 'rt_mutex_owner'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
332 | if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
| ^
>> kernel/rcu/tree_stall.h:332:48: warning: comparison between pointer and integer ('int' and 'struct task_struct *') [-Wpointer-integer-compare]
332 | if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~
In file included from kernel/rcu/tree.c:5115:
In file included from kernel/rcu/tree_plugin.h:14:
kernel/rcu/../locking/rtmutex_common.h:231:35: error: conflicting types for 'rt_mutex_owner'
231 | static inline struct task_struct *rt_mutex_owner(struct rt_mutex_base *lock)
| ^
kernel/rcu/tree_stall.h:332:8: note: previous implicit declaration is here
332 | if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
| ^
1 warning and 2 errors generated.
vim +332 kernel/rcu/tree_stall.h
311
312 /*
313 * Report out the state of a not-running task that is stalling the
314 * current RCU grace period.
315 */
316 static int check_slow_task(struct task_struct *t, void *arg)
317 {
318 struct rcu_node *rnp;
319 struct rcu_stall_chk_rdr *rscrp = arg;
320
321 if (task_curr(t))
322 return -EBUSY; // It is running, so decline to inspect it.
323 rscrp->nesting = t->rcu_read_lock_nesting;
324 rscrp->rs = t->rcu_read_unlock_special;
325 rscrp->on_blkd_list = !list_empty(&t->rcu_node_entry);
326 rscrp->rcu_rdr_running = task_curr(t);
327 rscrp->rcu_rdr_boosted = 0;
328 if (rscrp->on_blkd_list) {
329 rnp = READ_ONCE(t->rcu_blocked_node);
330 raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */
331 if (rnp == READ_ONCE(t->rcu_blocked_node)) {
> 332 if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
333 rscrp->rcu_rdr_boosted = 1;
334 } else {
335 rscrp->rcu_rdr_boosted = 2;
336 }
337 raw_spin_unlock_rcu_node(rnp); /* irqs remain disabled. */
338 }
339 return 0;
340 }
341
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [paulmckrcu:dev.2026.09.09a 42/56] kernel/rcu/tree_stall.h:332:48: warning: comparison between pointer and integer ('int' and 'struct task_struct *')
2026-09-11 16:28 [paulmckrcu:dev.2026.09.09a 42/56] kernel/rcu/tree_stall.h:332:48: warning: comparison between pointer and integer ('int' and 'struct task_struct *') kernel test robot
@ 2026-09-11 17:10 ` Paul E. McKenney
0 siblings, 0 replies; 2+ messages in thread
From: Paul E. McKenney @ 2026-09-11 17:10 UTC (permalink / raw)
To: kernel test robot; +Cc: llvm, oe-kbuild-all
On Sat, Sep 12, 2026 at 12:28:38AM +0800, kernel test robot wrote:
> tree: https://github.com/paulmckrcu/linux dev.2026.09.09a
> head: d61d9b5dd56c6cf72b70bb5fb52b213ead9f7765
> commit: e33488c41be623f7c7ef5b8763e20c45f1364d1c [42/56] rcu: Add running and boosted indications to RCU task stall dump
> config: powerpc-tqm8xx_defconfig (https://download.01.org/0day-ci/archive/20260912/202609120047.u7Af769s-lkp@intel.com/config)
> compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260912/202609120047.u7Af769s-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/202609120047.u7Af769s-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> In file included from kernel/rcu/tree.c:5112:
> kernel/rcu/tree_stall.h:332:8: error: call to undeclared function 'rt_mutex_owner'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
> 332 | if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
> | ^
> >> kernel/rcu/tree_stall.h:332:48: warning: comparison between pointer and integer ('int' and 'struct task_struct *') [-Wpointer-integer-compare]
> 332 | if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
> | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~
> In file included from kernel/rcu/tree.c:5115:
> In file included from kernel/rcu/tree_plugin.h:14:
> kernel/rcu/../locking/rtmutex_common.h:231:35: error: conflicting types for 'rt_mutex_owner'
> 231 | static inline struct task_struct *rt_mutex_owner(struct rt_mutex_base *lock)
> | ^
> kernel/rcu/tree_stall.h:332:8: note: previous implicit declaration is here
> 332 | if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
> | ^
> 1 warning and 2 errors generated.
Good catch, updating this patch with attribution to #include rtmutex.h.
Thank you for your testing efforts!
Thanx, Paul
> vim +332 kernel/rcu/tree_stall.h
>
> 311
> 312 /*
> 313 * Report out the state of a not-running task that is stalling the
> 314 * current RCU grace period.
> 315 */
> 316 static int check_slow_task(struct task_struct *t, void *arg)
> 317 {
> 318 struct rcu_node *rnp;
> 319 struct rcu_stall_chk_rdr *rscrp = arg;
> 320
> 321 if (task_curr(t))
> 322 return -EBUSY; // It is running, so decline to inspect it.
> 323 rscrp->nesting = t->rcu_read_lock_nesting;
> 324 rscrp->rs = t->rcu_read_unlock_special;
> 325 rscrp->on_blkd_list = !list_empty(&t->rcu_node_entry);
> 326 rscrp->rcu_rdr_running = task_curr(t);
> 327 rscrp->rcu_rdr_boosted = 0;
> 328 if (rscrp->on_blkd_list) {
> 329 rnp = READ_ONCE(t->rcu_blocked_node);
> 330 raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */
> 331 if (rnp == READ_ONCE(t->rcu_blocked_node)) {
> > 332 if (rt_mutex_owner(&rnp->boost_mtx.rtmutex) == t)
> 333 rscrp->rcu_rdr_boosted = 1;
> 334 } else {
> 335 rscrp->rcu_rdr_boosted = 2;
> 336 }
> 337 raw_spin_unlock_rcu_node(rnp); /* irqs remain disabled. */
> 338 }
> 339 return 0;
> 340 }
> 341
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
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2026-09-11 16:28 [paulmckrcu:dev.2026.09.09a 42/56] kernel/rcu/tree_stall.h:332:48: warning: comparison between pointer and integer ('int' and 'struct task_struct *') kernel test robot
2026-09-11 17:10 ` Paul E. McKenney
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