Re: drivers/firmware/efi/libstub/vsprintf.c:511:5: warning: no previous prototype for function 'efi_snprintf'

["Ard Biesheuvel" <ardb@kernel.org>]

Please stop spamming me with reports about code that appeared
on one of my branches for a brief period, was apparently pulled
into some intel LKP branch but was never submitted by me for any
kind of review.

Thanks.


On Wed, 9 Sep 2026, at 09:00, kernel test robot wrote:
> tree:   
> https://github.com/intel-lab-lkp/linux/commits/Ard-Biesheuvel/x86-boot-Drop-pointless-re-implementation-of-panic/20260906-150819
> head:   c551ec0edb0b057c415d5530905c288523a9bde8
> commit: c551ec0edb0b057c415d5530905c288523a9bde8 efi/libstub: Add 
> efi_snprintf() to construct wide strings
> date:   3 days ago
> config: loongarch-allyesconfig 
> (https://download.01.org/0day-ci/archive/20260909/202609090804.938npPl7-lkp@intel.com/config)
> compiler: clang version 22.1.8 (https://github.com/llvm/llvm-project 
> ca7933e47d3a3451d81e72ac174dcb5aa28b59d1)
> reproduce (this is a W=1 build): 
> (https://download.01.org/0day-ci/archive/20260909/202609090804.938npPl7-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/202609090804.938npPl7-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    drivers/firmware/efi/libstub/vsprintf.c:274:5: warning: no previous 
> prototype for function 'efi_vsnprintf' [-Wmissing-prototypes]
>      274 | int efi_vsnprintf(efi_char16_t *buf, size_t size, const char 
> *fmt, va_list ap,
>          |     ^
>    drivers/firmware/efi/libstub/vsprintf.c:274:1: note: declare 
> 'static' if the function is not intended to be used outside of this 
> translation unit
>      274 | int efi_vsnprintf(efi_char16_t *buf, size_t size, const char 
> *fmt, va_list ap,
>          | ^
>          | static 
>>> drivers/firmware/efi/libstub/vsprintf.c:511:5: warning: no previous prototype for function 'efi_snprintf' [-Wmissing-prototypes]
>      511 | int efi_snprintf(efi_char16_t *buf, size_t size, const char 
> *fmt, ...)
>          |     ^
>    drivers/firmware/efi/libstub/vsprintf.c:511:1: note: declare 
> 'static' if the function is not intended to be used outside of this 
> translation unit
>      511 | int efi_snprintf(efi_char16_t *buf, size_t size, const char 
> *fmt, ...)
>          | ^
>          | static 
>    2 warnings generated.
>
>
> vim +/efi_snprintf +511 drivers/firmware/efi/libstub/vsprintf.c
>
>    510	
>  > 511	int efi_snprintf(efi_char16_t *buf, size_t size, const char *fmt, ...)
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki