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

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

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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 sparc-next/master xtensa/for_next]
[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-r036-20200826 (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@intel.com>

All errors (new ones prefixed by >>):

   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);
        ^
   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/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/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:938:14: warning: initializer overrides prior initialization of this subobject [-Winitializer-overrides]
                   .matches = needs_tx2_tvm_workaround,
                              ^~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:937:3: note: previous initialization is here
                   ERRATA_MIDR_RANGE_LIST(tx2_family_cpus),
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:520:2: note: expanded from macro 'ERRATA_MIDR_RANGE_LIST'
           CAP_MIDR_RANGE_LIST(midr_list)
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/arm64/kernel/cpu_errata.c:501:13: note: expanded from macro 'CAP_MIDR_RANGE_LIST'
           .matches = is_affected_midr_range_list,                 \
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
   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 
   2 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 kernel/fork.c:101:
>> 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);
        ^
   kernel/fork.c:743:20: warning: no previous prototype for function 'arch_task_cache_init' [-Wmissing-prototypes]
   void __init __weak arch_task_cache_init(void) { }
                      ^
   kernel/fork.c:743:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init __weak arch_task_cache_init(void) { }
   ^
   static 
   kernel/fork.c:834:12: warning: no previous prototype for function 'arch_dup_task_struct' [-Wmissing-prototypes]
   int __weak arch_dup_task_struct(struct task_struct *dst,
              ^
   kernel/fork.c:834:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int __weak arch_dup_task_struct(struct task_struct *dst,
   ^
   static 
   2 warnings and 1 error generated.
--
   In file included from kernel/sched/core.c:13:
   In file included from kernel/sched/sched.h:54:
   In file included from include/linux/mmu_context.h:5:
>> 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);
        ^
   kernel/sched/core.c:2380:6: warning: no previous prototype for function 'sched_set_stop_task' [-Wmissing-prototypes]
   void sched_set_stop_task(int cpu, struct task_struct *stop)
        ^
   kernel/sched/core.c:2380:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void sched_set_stop_task(int cpu, struct task_struct *stop)
   ^
   static 
   kernel/sched/core.c:4635:35: warning: no previous prototype for function 'schedule_user' [-Wmissing-prototypes]
   asmlinkage __visible void __sched schedule_user(void)
                                     ^
   kernel/sched/core.c:4635:22: note: declare 'static' if the function is not intended to be used outside of this translation unit
   asmlinkage __visible void __sched schedule_user(void)
                        ^
                        static 
   2 warnings and 1 error generated.
--
   In file included from kernel/sched/fair.c:23:
   In file included from kernel/sched/sched.h:54:
   In file included from include/linux/mmu_context.h:5:
>> 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);
        ^
   kernel/sched/fair.c:5364:6: warning: no previous prototype for function 'init_cfs_bandwidth' [-Wmissing-prototypes]
   void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
        ^
   kernel/sched/fair.c:5364:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
   ^
   static 
   kernel/sched/fair.c:11108:6: warning: no previous prototype for function 'free_fair_sched_group' [-Wmissing-prototypes]
   void free_fair_sched_group(struct task_group *tg) { }
        ^
   kernel/sched/fair.c:11108:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void free_fair_sched_group(struct task_group *tg) { }
   ^
   static 
   kernel/sched/fair.c:11110:5: warning: no previous prototype for function 'alloc_fair_sched_group' [-Wmissing-prototypes]
   int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
       ^
   kernel/sched/fair.c:11110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
   ^
   static 
   kernel/sched/fair.c:11115:6: warning: no previous prototype for function 'online_fair_sched_group' [-Wmissing-prototypes]
   void online_fair_sched_group(struct task_group *tg) { }
        ^
   kernel/sched/fair.c:11115:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void online_fair_sched_group(struct task_group *tg) { }
   ^
   static 
   kernel/sched/fair.c:11117:6: warning: no previous prototype for function 'unregister_fair_sched_group' [-Wmissing-prototypes]
   void unregister_fair_sched_group(struct task_group *tg) { }
        ^
   kernel/sched/fair.c:11117:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void unregister_fair_sched_group(struct task_group *tg) { }
   ^
   static 
   5 warnings and 1 error generated.
--
   In file included from kernel/sched/rt.c:6:
   In file included from kernel/sched/sched.h:54:
   In file included from include/linux/mmu_context.h:5:
>> 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);
        ^
   kernel/sched/rt.c:253:6: warning: no previous prototype for function 'free_rt_sched_group' [-Wmissing-prototypes]
   void free_rt_sched_group(struct task_group *tg) { }
        ^
   kernel/sched/rt.c:253:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void free_rt_sched_group(struct task_group *tg) { }
   ^
   static 
   kernel/sched/rt.c:255:5: warning: no previous prototype for function 'alloc_rt_sched_group' [-Wmissing-prototypes]
   int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
       ^
   kernel/sched/rt.c:255:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
   ^
   static 
   kernel/sched/rt.c:668:6: warning: no previous prototype for function 'sched_rt_bandwidth_account' [-Wmissing-prototypes]
   bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
        ^
   kernel/sched/rt.c:668:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool sched_rt_bandwidth_account(struct rt_rq *rt_rq)
   ^
   static 
   3 warnings and 1 error generated.

# 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@lists.01.org

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