[akpm-mm:mm-nonmm-unstable 82/133] include/linux/kexec_handover.h:108:7: warning: no previous prototype for function 'kho_alloc_preserve'

[akpm-mm:mm-nonmm-unstable 82/133] include/linux/kexec_handover.h:108:7: warning: no previous prototype for function 'kho_alloc_preserve'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
head:   4fc88c237bfe11bde443e104428aac56e63a997f
commit: 88316955b5b1b4cb0cb2fad416f7e8dde9b246a0 [82/133] kho: introduce high-level memory allocation API
config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20251116/202511160314.OK0OGRXl-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0bba1e76581bad04e7d7f09f5115ae5e2989e0d9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251116/202511160314.OK0OGRXl-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/202511160314.OK0OGRXl-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from mm/mm_init.c:33:
>> include/linux/kexec_handover.h:108:7: warning: no previous prototype for function 'kho_alloc_preserve' [-Wmissing-prototypes]
     108 | void *kho_alloc_preserve(size_t size)
         |       ^
   include/linux/kexec_handover.h:108:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     108 | void *kho_alloc_preserve(size_t size)
         | ^
         | static 
>> include/linux/kexec_handover.h:113:6: warning: no previous prototype for function 'kho_unpreserve_free' [-Wmissing-prototypes]
     113 | void kho_unpreserve_free(void *mem) { }
         |      ^
   include/linux/kexec_handover.h:113:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     113 | void kho_unpreserve_free(void *mem) { }
         | ^
         | static 
>> include/linux/kexec_handover.h:114:6: warning: no previous prototype for function 'kho_restore_free' [-Wmissing-prototypes]
     114 | void kho_restore_free(void *mem) { }
         |      ^
   include/linux/kexec_handover.h:114:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
     114 | void kho_restore_free(void *mem) { }
         | ^
         | static 
   3 warnings generated.


vim +/kho_alloc_preserve +108 include/linux/kexec_handover.h

   107	
 > 108	void *kho_alloc_preserve(size_t size)
   109	{
   110		return ERR_PTR(-EOPNOTSUPP);
   111	}
   112	
 > 113	void kho_unpreserve_free(void *mem) { }
 > 114	void kho_restore_free(void *mem) { }
   115	

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https://github.com/intel/lkp-tests/wiki

Re: [akpm-mm:mm-nonmm-unstable 82/133] include/linux/kexec_handover.h:108:7: warning: no previous prototype for function 'kho_alloc_preserve'

[Pasha Tatashin]

On Sat, Nov 15, 2025 at 2:06 PM kernel test robot <lkp@intel.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-nonmm-unstable
> head:   4fc88c237bfe11bde443e104428aac56e63a997f
> commit: 88316955b5b1b4cb0cb2fad416f7e8dde9b246a0 [82/133] kho: introduce high-level memory allocation API
> config: arm-allnoconfig (https://download.01.org/0day-ci/archive/20251116/202511160314.OK0OGRXl-lkp@intel.com/config)
> compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 0bba1e76581bad04e7d7f09f5115ae5e2989e0d9)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251116/202511160314.OK0OGRXl-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/202511160314.OK0OGRXl-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    In file included from mm/mm_init.c:33:
> >> include/linux/kexec_handover.h:108:7: warning: no previous prototype for function 'kho_alloc_preserve' [-Wmissing-prototypes]
>      108 | void *kho_alloc_preserve(size_t size)
>          |       ^
>    include/linux/kexec_handover.h:108:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>      108 | void *kho_alloc_preserve(size_t size)
>          | ^
>          | static
> >> include/linux/kexec_handover.h:113:6: warning: no previous prototype for function 'kho_unpreserve_free' [-Wmissing-prototypes]
>      113 | void kho_unpreserve_free(void *mem) { }
>          |      ^
>    include/linux/kexec_handover.h:113:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>      113 | void kho_unpreserve_free(void *mem) { }
>          | ^
>          | static
> >> include/linux/kexec_handover.h:114:6: warning: no previous prototype for function 'kho_restore_free' [-Wmissing-prototypes]
>      114 | void kho_restore_free(void *mem) { }
>          |      ^
>    include/linux/kexec_handover.h:114:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>      114 | void kho_restore_free(void *mem) { }
>          | ^
>          | static
>    3 warnings generated.
>
>
> vim +/kho_alloc_preserve +108 include/linux/kexec_handover.h
>
>    107
>  > 108  void *kho_alloc_preserve(size_t size)
>    109  {
>    110          return ERR_PTR(-EOPNOTSUPP);
>    111  }
>    112
>  > 113  void kho_unpreserve_free(void *mem) { }
>  > 114  void kho_restore_free(void *mem) { }
>    115
>

Sorry, missed "static inline"

For, this another warnings:

diff --git a/include/linux/kexec_handover.h b/include/linux/kexec_handover.h
index 38a9487a1a00..dde952227b88 100644
--- a/include/linux/kexec_handover.h
+++ b/include/linux/kexec_handover.h
@@ -105,13 +105,13 @@ static inline int kho_unpreserve_vmalloc(struct
kho_vmalloc *preservation)
        return -EOPNOTSUPP;
 }

-void *kho_alloc_preserve(size_t size)
+static inline void *kho_alloc_preserve(size_t size)
 {
        return ERR_PTR(-EOPNOTSUPP);
 }

-void kho_unpreserve_free(void *mem) { }
-void kho_restore_free(void *mem) { }
+static inline void kho_unpreserve_free(void *mem) { }
+static inline void kho_restore_free(void *mem) { }

 static inline struct folio *kho_restore_folio(phys_addr_t phys)
 {



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