arch/powerpc/include/asm/switch_to.h:53:2: error: call to '__compiletime_assert_256' declared with 'error' attribute: BUILD_BUG failed

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   de5cb0dcb74c294ec527eddfe5094acfdb21ff21
commit: c2e5d70cf05b48bfbd5b6625bbd0ec3052cecd5d powerpc/83xx: Fix build failure with FPU=n
date:   7 months ago
config: powerpc-randconfig-001-20240923 (https://download.01.org/0day-ci/archive/20240923/202409230705.hFpB3jMt-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240923/202409230705.hFpB3jMt-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/202409230705.hFpB3jMt-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/cpufreq/pmac32-cpufreq.c:21:
   In file included from include/linux/pmu.h:12:
   In file included from include/linux/rtc.h:17:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:24:
   In file included from include/linux/mm.h:2188:
   include/linux/vmstat.h:522:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     522 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
   In file included from drivers/cpufreq/pmac32-cpufreq.c:38:
>> arch/powerpc/include/asm/switch_to.h:53:2: error: call to '__compiletime_assert_256' declared with 'error' attribute: BUILD_BUG failed
      53 |         BUILD_BUG();
         |         ^
   include/linux/build_bug.h:59:21: note: expanded from macro 'BUILD_BUG'
      59 | #define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
         |                     ^
   include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
      39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
         |                                     ^
   include/linux/compiler_types.h:435:2: note: expanded from macro 'compiletime_assert'
     435 |         _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
         |         ^
   include/linux/compiler_types.h:423:2: note: expanded from macro '_compiletime_assert'
     423 |         __compiletime_assert(condition, msg, prefix, suffix)
         |         ^
   include/linux/compiler_types.h:416:4: note: expanded from macro '__compiletime_assert'
     416 |                         prefix ## suffix();                             \
         |                         ^
   <scratch space>:106:1: note: expanded from here
     106 | __compiletime_assert_256
         | ^
   1 warning and 1 error generated.


vim +53 arch/powerpc/include/asm/switch_to.h

    38	
    39	#ifdef CONFIG_PPC_FPU
    40	extern void enable_kernel_fp(void);
    41	extern void flush_fp_to_thread(struct task_struct *);
    42	extern void giveup_fpu(struct task_struct *);
    43	extern void save_fpu(struct task_struct *);
    44	static inline void disable_kernel_fp(void)
    45	{
    46		msr_check_and_clear(MSR_FP);
    47	}
    48	#else
    49	static inline void save_fpu(struct task_struct *t) { }
    50	static inline void flush_fp_to_thread(struct task_struct *t) { }
    51	static inline void enable_kernel_fp(void)
    52	{
  > 53		BUILD_BUG();
    54	}
    55	#endif
    56	

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