Re: [PATCH v2 05/23] arm64: use asm-generic/mmu_context.h for no-op implementations

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Hi Nicholas,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.9-rc2 next-20200826]
[cannot apply to sparc/master asm-generic/master]
[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]

url:    https://github.com/0day-ci/linux/commits/Nicholas-Piggin/Use-asm-generic-for-mmu_context-no-op-functions/20200826-225632
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ac69819ba9e3d8d550bb5d2d2df74848e556812
config: arm64-randconfig-r002-20200826 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 7cfcecece0e0430937cf529ce74d3a071a4dedc6)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

   In file included from arch/arm64/kernel/process.c:54:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/kernel/process.c:260:6: warning: no previous prototype for function '__show_regs' [-Wmissing-prototypes]
   void __show_regs(struct pt_regs *regs)
        ^
   arch/arm64/kernel/process.c:260:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __show_regs(struct pt_regs *regs)
   ^
   static 
   arch/arm64/kernel/process.c:352:5: warning: no previous prototype for function 'arch_dup_task_struct' [-Wmissing-prototypes]
   int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
       ^
   arch/arm64/kernel/process.c:352:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
   ^
   static 
   arch/arm64/kernel/process.c:554:41: warning: no previous prototype for function '__switch_to' [-Wmissing-prototypes]
   __notrace_funcgraph struct task_struct *__switch_to(struct task_struct *prev,
                                           ^
   arch/arm64/kernel/process.c:554:21: note: declare 'static' if the function is not intended to be used outside of this translation unit
   __notrace_funcgraph struct task_struct *__switch_to(struct task_struct *prev,
                       ^
                       static 
   arch/arm64/kernel/process.c:692:25: warning: no previous prototype for function 'arm64_preempt_schedule_irq' [-Wmissing-prototypes]
   asmlinkage void __sched arm64_preempt_schedule_irq(void)
                           ^
   arch/arm64/kernel/process.c:692:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage void __sched arm64_preempt_schedule_irq(void)
              ^
              static 
   4 warnings and 1 error generated.
--
   In file included from arch/arm64/kernel/setup.c:50:
   In file included from arch/arm64/include/asm/efi.h:10:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   1 error generated.
--
   In file included from arch/arm64/kernel/cpu_errata.c:111:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/kernel/cpu_errata.c:295:13: warning: no previous prototype for function 'arm64_update_smccc_conduit' [-Wmissing-prototypes]
   void __init arm64_update_smccc_conduit(struct alt_instr *alt,
               ^
   arch/arm64/kernel/cpu_errata.c:295:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init arm64_update_smccc_conduit(struct alt_instr *alt,
   ^
   static 
   arch/arm64/kernel/cpu_errata.c:317:13: warning: no previous prototype for function 'arm64_enable_wa2_handling' [-Wmissing-prototypes]
   void __init arm64_enable_wa2_handling(struct alt_instr *alt,
               ^
   arch/arm64/kernel/cpu_errata.c:317:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init arm64_enable_wa2_handling(struct alt_instr *alt,
   ^
   static 
   arch/arm64/kernel/cpu_errata.c:747:3: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
                   ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:506:2: note: expanded from macro 'ERRATA_MIDR_REV_RANGE'
           ERRATA_MIDR_RANGE(m, var, r_min, var, r_max)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:498:2: note: expanded from macro 'ERRATA_MIDR_RANGE'
           CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:486:13: note: expanded from macro 'CAP_MIDR_RANGE'
           .matches = is_affected_midr_range,                      \
                      ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:746:14: note: previous initialization is here
                   .matches = is_affected_midr_range,
                              ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:753:3: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
                   ERRATA_MIDR_REV(MIDR_BRAHMA_B53, 0, 0),
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:510:2: note: expanded from macro 'ERRATA_MIDR_REV'
           ERRATA_MIDR_RANGE(model, var, rev, var, rev)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:498:2: note: expanded from macro 'ERRATA_MIDR_RANGE'
           CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:486:13: note: expanded from macro 'CAP_MIDR_RANGE'
           .matches = is_affected_midr_range,                      \
                      ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:752:14: note: previous initialization is here
                   .matches = is_affected_midr_range,
                              ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:913:11: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
                   .type = (ARM64_CPUCAP_SCOPE_LOCAL_CPU |
                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:912:3: note: previous initialization is here
                   ERRATA_MIDR_RANGE_LIST(erratum_1418040_list),
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:519:10: note: expanded from macro 'ERRATA_MIDR_RANGE_LIST'
           .type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,                 \
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/include/asm/cpufeature.h:258:2: note: expanded from macro 'ARM64_CPUCAP_LOCAL_CPU_ERRATUM'
           (ARM64_CPUCAP_SCOPE_LOCAL_CPU | ARM64_CPUCAP_OPTIONAL_FOR_LATE_CPU)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   5 warnings and 1 error generated.
--
   In file included from arch/arm64/kernel/smp.c:43:
   In file included from arch/arm64/include/asm/kvm_mmu.h:90:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/kernel/smp.c:842:6: warning: no previous prototype for function 'arch_irq_work_raise' [-Wmissing-prototypes]
   void arch_irq_work_raise(void)
        ^
   arch/arm64/kernel/smp.c:842:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void arch_irq_work_raise(void)
   ^
   static 
   arch/arm64/kernel/smp.c:863:6: warning: no previous prototype for function 'panic_smp_self_stop' [-Wmissing-prototypes]
   void panic_smp_self_stop(void)
        ^
   arch/arm64/kernel/smp.c:863:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void panic_smp_self_stop(void)
   ^
   static 
   arch/arm64/kernel/smp.c:1067:5: warning: no previous prototype for function 'setup_profiling_timer' [-Wmissing-prototypes]
   int setup_profiling_timer(unsigned int multiplier)
       ^
   arch/arm64/kernel/smp.c:1067:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int setup_profiling_timer(unsigned int multiplier)
   ^
   static 
   3 warnings and 1 error generated.
--
   In file included from arch/arm64/kernel/suspend.c:14:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/kernel/suspend.c:32:13: warning: no previous prototype for function 'cpu_suspend_set_dbg_restorer' [-Wmissing-prototypes]
   void __init cpu_suspend_set_dbg_restorer(int (*hw_bp_restore)(unsigned int))
               ^
   arch/arm64/kernel/suspend.c:32:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init cpu_suspend_set_dbg_restorer(int (*hw_bp_restore)(unsigned int))
   ^
   static 
   1 warning and 1 error generated.
--
   In file included from arch/arm64/kernel/machine_kexec.c:21:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/kernel/machine_kexec.c:250:6: warning: no previous prototype for function 'machine_crash_shutdown' [-Wmissing-prototypes]
   void machine_crash_shutdown(struct pt_regs *regs)
        ^
   arch/arm64/kernel/machine_kexec.c:250:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void machine_crash_shutdown(struct pt_regs *regs)
   ^
   static 
   1 warning and 1 error generated.
--
   In file included from arch/arm64/mm/mmu.c:35:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/mm/mmu.c:1135:6: warning: no previous prototype for function 'vmemmap_free' [-Wmissing-prototypes]
   void vmemmap_free(unsigned long start, unsigned long end,
        ^
   arch/arm64/mm/mmu.c:1135:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void vmemmap_free(unsigned long start, unsigned long end,
   ^
   static 
   1 warning and 1 error generated.
--
   In file included from arch/arm64/mm/context.c:16:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/mm/context.c:201:6: error: conflicting types for 'check_and_switch_context'
   void check_and_switch_context(struct mm_struct *mm)
        ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: previous declaration is here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   2 errors generated.
--
   In file included from arch/arm64/kvm/va_layout.c:13:
   In file included from arch/arm64/include/asm/kvm_mmu.h:90:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/kvm/va_layout.c:137:6: warning: no previous prototype for function 'kvm_patch_vector_branch' [-Wmissing-prototypes]
   void kvm_patch_vector_branch(struct alt_instr *alt,
        ^
   arch/arm64/kvm/va_layout.c:137:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void kvm_patch_vector_branch(struct alt_instr *alt,
   ^
   static 
   1 warning and 1 error generated.
--
   In file included from arch/arm64/kvm/handle_exit.c:19:
   In file included from arch/arm64/include/asm/kvm_mmu.h:90:
>> arch/arm64/include/asm/mmu_context.h:226:31: error: too few arguments to function call, expected 2, have 1
           check_and_switch_context(next);
           ~~~~~~~~~~~~~~~~~~~~~~~~     ^
   arch/arm64/include/asm/mmu_context.h:177:6: note: 'check_and_switch_context' declared here
   void check_and_switch_context(struct mm_struct *mm, unsigned int cpu);
        ^
   arch/arm64/kvm/handle_exit.c:178:21: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_WFx]        = kvm_handle_wfx,
                                     ^~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:179:25: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_CP15_32]    = kvm_handle_cp15_32,
                                     ^~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:180:25: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_CP15_64]    = kvm_handle_cp15_64,
                                     ^~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:181:25: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_CP14_MR]    = kvm_handle_cp14_32,
                                     ^~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:182:25: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_CP14_LS]    = kvm_handle_cp14_load_store,
                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:183:25: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_CP14_64]    = kvm_handle_cp14_64,
                                     ^~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:184:23: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_HVC32]      = handle_hvc,
                                     ^~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:185:23: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_SMC32]      = handle_smc,
                                     ^~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:186:23: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_HVC64]      = handle_hvc,
                                     ^~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:187:23: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_SMC64]      = handle_smc,
                                     ^~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:188:23: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_SYS64]      = kvm_handle_sys_reg,
                                     ^~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:189:21: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_SVE]        = handle_sve,
                                     ^~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:190:26: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_IABT_LOW]   = kvm_handle_guest_abort,
                                     ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:191:26: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_DABT_LOW]   = kvm_handle_guest_abort,
                                     ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:192:28: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,
                                     ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,
                                     ^~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:193:28: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
           [ESR_ELx_EC_WATCHPT_LOW]= kvm_handle_guest_debug,
                                     ^~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kvm/handle_exit.c:177:27: note: previous initialization is here
           [0 ... ESR_ELx_EC_MAX]  = kvm_handle_unknown_ec,

# https://github.com/0day-ci/linux/commit/b7168fc5046fd65223bdc51ef411e157939433b6
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Nicholas-Piggin/Use-asm-generic-for-mmu_context-no-op-functions/20200826-225632
git checkout b7168fc5046fd65223bdc51ef411e157939433b6
vim +226 arch/arm64/include/asm/mmu_context.h

d96cc49bff5a77 Will Deacon     2017-12-06  214  
39bc88e5e38e9b Catalin Marinas 2016-09-02  215  static inline void __switch_mm(struct mm_struct *next)
39bc88e5e38e9b Catalin Marinas 2016-09-02  216  {
e53f21bce4d35a Catalin Marinas 2015-03-23  217  	/*
e53f21bce4d35a Catalin Marinas 2015-03-23  218  	 * init_mm.pgd does not contain any user mappings and it is always
e53f21bce4d35a Catalin Marinas 2015-03-23  219  	 * active for kernel addresses in TTBR1. Just set the reserved TTBR0.
e53f21bce4d35a Catalin Marinas 2015-03-23  220  	 */
e53f21bce4d35a Catalin Marinas 2015-03-23  221  	if (next == &init_mm) {
e53f21bce4d35a Catalin Marinas 2015-03-23  222  		cpu_set_reserved_ttbr0();
e53f21bce4d35a Catalin Marinas 2015-03-23  223  		return;
e53f21bce4d35a Catalin Marinas 2015-03-23  224  	}
e53f21bce4d35a Catalin Marinas 2015-03-23  225  
c4885bbb3afee8 Pingfan Liu     2020-07-10 @226  	check_and_switch_context(next);
b3901d54dc4f73 Catalin Marinas 2012-03-05  227  }
b3901d54dc4f73 Catalin Marinas 2012-03-05  228  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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