linux-kernel - [tip:core/urgent 1/1] include/linux/context_tracking.h:99:19: error: redefinition of '__ct

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Date:   Mon, 20 Mar 2023 21:04:00 +0800
From:   kernel test robot <lkp@...el.com>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: [tip:core/urgent 1/1] include/linux/context_tracking.h:99:19: error:
 redefinition of '__ct_state'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/urgent
head:   3e2619c4ebba2cab8414c55b131b7a28f628de3b
commit: 3e2619c4ebba2cab8414c55b131b7a28f628de3b [1/1] entry: Fix noinstr warning in __enter_from_user_mode()
config: powerpc-allyesconfig (https://download.01.org/0day-ci/archive/20230320/202303202052.lv1EF1t6-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 12.1.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=3e2619c4ebba2cab8414c55b131b7a28f628de3b
        git remote add tip https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
        git fetch --no-tags tip core/urgent
        git checkout 3e2619c4ebba2cab8414c55b131b7a28f628de3b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=powerpc prepare

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303202052.lv1EF1t6-lkp@intel.com/

All errors (new ones prefixed by >>):

   scripts/genksyms/parse.y: warning: 9 shift/reduce conflicts [-Wconflicts-sr]
   scripts/genksyms/parse.y: warning: 5 reduce/reduce conflicts [-Wconflicts-rr]
   scripts/genksyms/parse.y: note: rerun with option '-Wcounterexamples' to generate conflict counterexamples
   In file included from include/linux/kvm_host.h:26,
                    from arch/powerpc/include/asm/kvm_ppc.h:19,
                    from arch/powerpc/include/asm/dbell.h:17,
                    from arch/powerpc/kernel/asm-offsets.c:36:
>> include/linux/context_tracking.h:99:19: error: redefinition of '__ct_state'
      99 | static inline int __ct_state(void) { return -1; }
         |                   ^~~~~~~~~~
   In file included from include/linux/hardirq.h:5,
                    from include/linux/interrupt.h:11,
                    from include/linux/kernel_stat.h:9,
                    from include/linux/cgroup.h:26,
                    from include/linux/memcontrol.h:13,
                    from include/linux/swap.h:9,
                    from include/linux/suspend.h:5,
                    from arch/powerpc/kernel/asm-offsets.c:21:
   include/linux/context_tracking_state.h:50:28: note: previous definition of '__ct_state' with type 'int(void)'
      50 | static __always_inline int __ct_state(void)
         |                            ^~~~~~~~~~
   make[2]: *** [scripts/Makefile.build:114: arch/powerpc/kernel/asm-offsets.s] Error 1
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:1286: prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:226: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +/__ct_state +99 include/linux/context_tracking.h

    90	
    91	#else
    92	static inline void user_enter(void) { }
    93	static inline void user_exit(void) { }
    94	static inline void user_enter_irqoff(void) { }
    95	static inline void user_exit_irqoff(void) { }
    96	static inline int exception_enter(void) { return 0; }
    97	static inline void exception_exit(enum ctx_state prev_ctx) { }
    98	static inline int ct_state(void) { return -1; }
  > 99	static inline int __ct_state(void) { return -1; }
   100	static __always_inline bool context_tracking_guest_enter(void) { return false; }
   101	static inline void context_tracking_guest_exit(void) { }
   102	#define CT_WARN_ON(cond) do { } while (0)
   103	#endif /* !CONFIG_CONTEXT_TRACKING_USER */
   104	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests