arch/loongarch/kernel/paravirt.c:15:1: sparse: sparse: symbol '__pcpu_scope_steal_time' was not declared. Should it be static?

arch/loongarch/kernel/paravirt.c:15:1: sparse: sparse: symbol '__pcpu_scope_steal_time' was not declared. Should it be static?

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   74fe02ce122a6103f207d29fafc8b3a53de6abaf
commit: c43dce6f13fb12144571c168c7a593e5e546f3b5 LoongArch: KVM: Make vcpu_is_preempted() as a macro rather than function
date:   4 weeks ago
config: loongarch-randconfig-r134-20260505 (https://download.01.org/0day-ci/archive/20260506/202605061313.O8Hswm2b-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260506/202605061313.O8Hswm2b-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
| Fixes: c43dce6f13fb ("LoongArch: KVM: Make vcpu_is_preempted() as a macro rather than function")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202605061313.O8Hswm2b-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> arch/loongarch/kernel/paravirt.c:15:1: sparse: sparse: symbol '__pcpu_scope_steal_time' was not declared. Should it be static?
   arch/loongarch/kernel/paravirt.c: note: in included file (through arch/loongarch/include/asm/loongarch.h, arch/loongarch/include/asm/cpu-info.h, arch/loongarch/include/asm/cpu-features.h, ...):
   /opt/cross/clang-5bac06718f/lib/clang/23/include/larchintrin.h:202:24: sparse: sparse: undefined identifier '__builtin_loongarch_cpucfg'
   /opt/cross/clang-5bac06718f/lib/clang/23/include/larchintrin.h:202:11: sparse: sparse: cast from unknown type
   /opt/cross/clang-5bac06718f/lib/clang/23/include/larchintrin.h:202:11: sparse: sparse: cast from unknown type

vim +/__pcpu_scope_steal_time +15 arch/loongarch/kernel/paravirt.c

    11	
    12	static int has_steal_clock;
    13	DEFINE_STATIC_KEY_FALSE(virt_preempt_key);
    14	DEFINE_STATIC_KEY_FALSE(virt_spin_lock_key);
  > 15	DEFINE_PER_CPU(struct kvm_steal_time, steal_time) __aligned(64);
    16	

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0-DAY CI Kernel Test Service
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Re: arch/loongarch/kernel/paravirt.c:15:1: sparse: sparse: symbol '__pcpu_scope_steal_time' was not declared. Should it be static?

[Bibo Mao]

On 2026/5/6 下午1:44, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   74fe02ce122a6103f207d29fafc8b3a53de6abaf
> commit: c43dce6f13fb12144571c168c7a593e5e546f3b5 LoongArch: KVM: Make vcpu_is_preempted() as a macro rather than function
> date:   4 weeks ago
> config: loongarch-randconfig-r134-20260505 (https://download.01.org/0day-ci/archive/20260506/202605061313.O8Hswm2b-lkp@intel.com/config)
> compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
> sparse: v0.6.5-rc1
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260506/202605061313.O8Hswm2b-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
> | Fixes: c43dce6f13fb ("LoongArch: KVM: Make vcpu_is_preempted() as a macro rather than function")
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202605061313.O8Hswm2b-lkp@intel.com/
> 
> sparse warnings: (new ones prefixed by >>)
>>> arch/loongarch/kernel/paravirt.c:15:1: sparse: sparse: symbol '__pcpu_scope_steal_time' was not declared. Should it be static?
with the config file, CONFIG_SMP is not set, Header file 
include/asm/qspinlock.h is not included. In theory varible steal_time 
should be defined with prefix static if CONFIG_SMP is not set, only that 
the code will be a little strange.

Is there any method to avoid warning about static variable declaration?

Regards
Bibo Mao

>     arch/loongarch/kernel/paravirt.c: note: in included file (through arch/loongarch/include/asm/loongarch.h, arch/loongarch/include/asm/cpu-info.h, arch/loongarch/include/asm/cpu-features.h, ...):
>     /opt/cross/clang-5bac06718f/lib/clang/23/include/larchintrin.h:202:24: sparse: sparse: undefined identifier '__builtin_loongarch_cpucfg'
>     /opt/cross/clang-5bac06718f/lib/clang/23/include/larchintrin.h:202:11: sparse: sparse: cast from unknown type
>     /opt/cross/clang-5bac06718f/lib/clang/23/include/larchintrin.h:202:11: sparse: sparse: cast from unknown type
> 
> vim +/__pcpu_scope_steal_time +15 arch/loongarch/kernel/paravirt.c
> 
>      11	
>      12	static int has_steal_clock;
>      13	DEFINE_STATIC_KEY_FALSE(virt_preempt_key);
>      14	DEFINE_STATIC_KEY_FALSE(virt_spin_lock_key);
>    > 15	DEFINE_PER_CPU(struct kvm_steal_time, steal_time) __aligned(64);
>      16	
>