Hi Sebastian,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tip/locking/core]
[also build test WARNING on linus/master v6.1-rc7 next-20221129]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Sebastian-Andrzej-Siewior/Re-Crash-with-PREEMPT_RT-on-aarch64-machine/20221129-000000
patch link:    https://lore.kernel.org/r/Y4Tapja2qq8HiHBZ%40linutronix.de
patch subject: Re: Crash with PREEMPT_RT on aarch64 machine
config: ia64-randconfig-s053-20221129
compiler: ia64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/d4aea399f0b5472dc15a4c623d99b4ae79005050
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Sebastian-Andrzej-Siewior/Re-Crash-with-PREEMPT_RT-on-aarch64-machine/20221129-000000
        git checkout d4aea399f0b5472dc15a4c623d99b4ae79005050
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=ia64 SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

sparse warnings: (new ones prefixed by >>)
   kernel/locking/rtmutex_api.c: note: in included file (through include/linux/irqflags.h, include/linux/spinlock.h):
   arch/ia64/include/asm/irqflags.h:64:9: sparse: sparse: context imbalance in 'rt_mutex_adjust_prio_chain' - different lock contexts for basic block
   arch/ia64/include/asm/irqflags.h:64:9: sparse: sparse: context imbalance in 'rt_mutex_slowlock_block' - unexpected unlock
   kernel/locking/rtmutex_api.c: note: in included file:
>> kernel/locking/rtmutex.c:117:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected struct task_struct *volatile @@     got unsigned long [assigned] val @@
   kernel/locking/rtmutex.c:117:9: sparse:     expected struct task_struct *volatile
   kernel/locking/rtmutex.c:117:9: sparse:     got unsigned long [assigned] val
>> kernel/locking/rtmutex.c:117:9: sparse: sparse: incorrect type in assignment (different base types) @@     expected struct task_struct *volatile @@     got unsigned long [assigned] val @@
   kernel/locking/rtmutex.c:117:9: sparse:     expected struct task_struct *volatile
   kernel/locking/rtmutex.c:117:9: sparse:     got unsigned long [assigned] val

vim +117 kernel/locking/rtmutex.c

   108	
   109	static __always_inline void
   110	rt_mutex_set_owner_pi(struct rt_mutex_base *lock, struct task_struct *owner)
   111	{
   112		unsigned long val = (unsigned long)owner;
   113	
   114		if (rt_mutex_has_waiters(lock))
   115			val |= RT_MUTEX_HAS_WAITERS;
   116	
 > 117		WRITE_ONCE(lock->owner, val);
   118	}
   119	

-- 
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https://01.org/lkp