Re: [PATCH bpf-next v2 05/11] bpf, arm64, powerpc: Add bpf_jit_bypass_spec_v1/v4()

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

Hi Luis,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 8582d9ab3efdebb88e0cd8beed8e0b9de76443e7]

url:    https://github.com/intel-lab-lkp/linux/commits/Luis-Gerhorst/selftests-bpf-Fix-caps-for-__xlated-jited_unpriv/20250421-175926
base:   8582d9ab3efdebb88e0cd8beed8e0b9de76443e7
patch link:    https://lore.kernel.org/r/20250421091802.3234859-6-luis.gerhorst%40fau.de
patch subject: [PATCH bpf-next v2 05/11] bpf, arm64, powerpc: Add bpf_jit_bypass_spec_v1/v4()
config: arm-randconfig-001-20250421 (https://download.01.org/0day-ci/archive/20250421/202504212030.IF1SLhz6-lkp@intel.com/config)
compiler: clang version 21.0.0git (https://github.com/llvm/llvm-project f819f46284f2a79790038e1f6649172789734ae8)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250421/202504212030.IF1SLhz6-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/202504212030.IF1SLhz6-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/bpf/core.c:3037:13: warning: no previous prototype for function 'bpf_jit_bypass_spec_v1' [-Wmissing-prototypes]
    3037 | bool __weak bpf_jit_bypass_spec_v1(void)
         |             ^
   kernel/bpf/core.c:3037:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    3037 | bool __weak bpf_jit_bypass_spec_v1(void)
         | ^
         | static 
>> kernel/bpf/core.c:3042:13: warning: no previous prototype for function 'bpf_jit_bypass_spec_v4' [-Wmissing-prototypes]
    3042 | bool __weak bpf_jit_bypass_spec_v4(void)
         |             ^
   kernel/bpf/core.c:3042:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    3042 | bool __weak bpf_jit_bypass_spec_v4(void)
         | ^
         | static 
   2 warnings generated.


vim +/bpf_jit_bypass_spec_v1 +3037 kernel/bpf/core.c

  3031	
  3032	/* By default, enable the verifier's mitigations against Spectre v1 and v4 for
  3033	 * all archs. The value returned must not change at runtime as there is
  3034	 * currently no support for reloading programs that were loaded without
  3035	 * mitigations.
  3036	 */
> 3037	bool __weak bpf_jit_bypass_spec_v1(void)
  3038	{
  3039		return false;
  3040	}
  3041	
> 3042	bool __weak bpf_jit_bypass_spec_v4(void)
  3043	{
  3044		return false;
  3045	}
  3046	

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