Re: [powerpc:fixes-test 10/12] kernel/sched/core.c:7449:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int

On Sat, Jul 11, 2026 at 04:54:17AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git fixes-test
> head:   afc2830892a128a13a65f677271a0a48aeb61b5e
> commit: 4747e17fe063720a30b1c0075bae3e8f8acd26f4 [10/12] powerpc/32: Use HAVE_PREEMPT_DYNAMIC_CALL instead of HAVE_PREEMPT_DYNAMIC_KEY
> config: powerpc-randconfig-002-20260711 (https://download.01.org/0day-ci/archive/20260711/[email protected]/config)
> compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260711/[email protected]/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 <[email protected]>
> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
> 
> All errors (new ones prefixed by >>):
> 
> >> kernel/sched/core.c:7449:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
>     7449 | EXPORT_STATIC_CALL_TRAMP(preempt_schedule);
>          | ^
>    include/linux/static_call.h:223:2: note: expanded from macro 'EXPORT_STATIC_CALL_TRAMP'
>      223 |         ARCH_ADD_TRAMP_KEY(name)
>          |         ^
> >> kernel/sched/core.c:7449:26: error: a parameter list without types is only allowed in a function definition
>     7449 | EXPORT_STATIC_CALL_TRAMP(preempt_schedule);
>          |                          ^

This happens with GCC as well.

  In file included from include/linux/tracepoint.h:22,
                   from include/trace/syscall.h:5,
                   from include/linux/syscalls.h:95,
                   from include/linux/syscalls_api.h:1,
                   from kernel/sched/core.c:16:
  include/linux/static_call.h:223:9: warning: data definition has no type or storage class
    223 |         ARCH_ADD_TRAMP_KEY(name)
        |         ^~~~~~~~~~~~~~~~~~
  kernel/sched/core.c:7449:1: note: in expansion of macro 'EXPORT_STATIC_CALL_TRAMP'
   7449 | EXPORT_STATIC_CALL_TRAMP(preempt_schedule);
        | ^~~~~~~~~~~~~~~~~~~~~~~~
  include/linux/static_call.h:223:9: error: type defaults to 'int' in declaration of 'ARCH_ADD_TRAMP_KEY' [-Wimplicit-int]
  kernel/sched/core.c:7449:1: note: in expansion of macro 'EXPORT_STATIC_CALL_TRAMP'
   7449 | EXPORT_STATIC_CALL_TRAMP(preempt_schedule);
        | ^~~~~~~~~~~~~~~~~~~~~~~~
  kernel/sched/core.c:7449:1: error: parameter names (without types) in function declaration [-Wdeclaration-missing-parameter-type]
   7449 | EXPORT_STATIC_CALL_TRAMP(preempt_schedule);
        | ^~~~~~~~~~~~~~~~~~~~~~~~

-- 
Cheers,
Nathan