Re: [PATCH 2/2] LoongArch: KVM: Add paravirt qspinlock in guest side

[kernel test robot <lkp@intel.com>]

Hi Bibo,

kernel test robot noticed the following build errors:

[auto build test ERROR on 7846b618e0a4c3e08888099d1d4512722b39ca99]

url:    https://github.com/intel-lab-lkp/linux/commits/Bibo-Mao/LoongArch-KVM-Add-paravirt-qspinlock-in-kvm-side/20240723-160536
base:   7846b618e0a4c3e08888099d1d4512722b39ca99
patch link:    https://lore.kernel.org/r/20240723073825.1811600-3-maobibo%40loongson.cn
patch subject: [PATCH 2/2] LoongArch: KVM: Add paravirt qspinlock in guest side
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20240724/202407240320.qqd1uWiE-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240724/202407240320.qqd1uWiE-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/202407240320.qqd1uWiE-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

>> arch/loongarch/kernel/paravirt.c:309: warning: expecting prototype for queued_spin_unlock(). Prototype was for native_queued_spin_unlock() instead
--
   In file included from include/linux/atomic.h:80,
                    from include/asm-generic/bitops/atomic.h:5,
                    from arch/loongarch/include/asm/bitops.h:27,
                    from include/linux/bitops.h:63,
                    from include/linux/kernel.h:23,
                    from include/linux/cpumask.h:11,
                    from include/linux/smp.h:13,
                    from kernel/locking/qspinlock.c:16:
   kernel/locking/qspinlock_paravirt.h: In function 'pv_kick_node':
>> include/linux/atomic/atomic-arch-fallback.h:242:34: error: initialization of 'u8 *' {aka 'unsigned char *'} from incompatible pointer type 'enum vcpu_state *' [-Wincompatible-pointer-types]
     242 |         typeof(*(_ptr)) *___op = (_oldp), ___o = *___op, ___r; \
         |                                  ^
   include/linux/atomic/atomic-instrumented.h:4908:9: note: in expansion of macro 'raw_try_cmpxchg_relaxed'
    4908 |         raw_try_cmpxchg_relaxed(__ai_ptr, __ai_oldp, __VA_ARGS__); \
         |         ^~~~~~~~~~~~~~~~~~~~~~~
   kernel/locking/qspinlock_paravirt.h:377:14: note: in expansion of macro 'try_cmpxchg_relaxed'
     377 |         if (!try_cmpxchg_relaxed(&pn->state, &old, vcpu_hashed))
         |              ^~~~~~~~~~~~~~~~~~~


vim +309 arch/loongarch/kernel/paravirt.c

   303	
   304	/**
   305	 * queued_spin_unlock - release a queued spinlock
   306	 * @lock : Pointer to queued spinlock structure
   307	 */
   308	static void native_queued_spin_unlock(struct qspinlock *lock)
 > 309	{
   310		/*
   311		 * unlock() needs release semantics:
   312		 */
   313		smp_store_release(&lock->locked, 0);
   314	}
   315	

-- 
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https://github.com/intel/lkp-tests/wiki