arch/x86/kernel/cpu/bugs.c:657:6: error: no previous prototype for 'unpriv_ebpf_notify'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e1f700ebd6bea293abe3c7e2807b252018efde01
commit: 44a3918c8245ab10c6c9719dd12e7a8d291980d8 x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting
date:   7 weeks ago
config: x86_64-sof-customedconfig-bpf-defconfig (https://download.01.org/0day-ci/archive/20220410/202204101514.YEhzsZ1Q-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.2.0-19) 11.2.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=44a3918c8245ab10c6c9719dd12e7a8d291980d8
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 44a3918c8245ab10c6c9719dd12e7a8d291980d8
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> arch/x86/kernel/cpu/bugs.c:657:6: error: no previous prototype for 'unpriv_ebpf_notify' [-Werror=missing-prototypes]
     657 | void unpriv_ebpf_notify(int new_state)
         |      ^~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +/unpriv_ebpf_notify +657 arch/x86/kernel/cpu/bugs.c

   655	
   656	#ifdef CONFIG_BPF_SYSCALL
 > 657	void unpriv_ebpf_notify(int new_state)
   658	{
   659		if (spectre_v2_enabled == SPECTRE_V2_EIBRS && !new_state)
   660			pr_err(SPECTRE_V2_EIBRS_EBPF_MSG);
   661	}
   662	#endif
   663	

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