[joro:sev-es-kexec 9/12] arch/x86/kernel/sev.c:698:17: warning: no previous prototype for function 'sev_jumptable_ap_park'

[joro:sev-es-kexec 9/12] arch/x86/kernel/sev.c:698:17: warning: no previous prototype for function 'sev_jumptable_ap_park'

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 5459 bytes --]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-kexec
head:   3467dc3cdbe65c619cd9b5c8db47da63b0655300
commit: f5fa86f9ca509214e22902fd1865e813d0d856b3 [9/12] x86/sev: Use AP Jump Table blob to stop CPU
config: x86_64-randconfig-a004-20210702 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9eb613b2de3163686b1a4bd1160f15ac56a4b083)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/commit/?id=f5fa86f9ca509214e22902fd1865e813d0d856b3
        git remote add joro https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git
        git fetch --no-tags joro sev-es-kexec
        git checkout f5fa86f9ca509214e22902fd1865e813d0d856b3
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/sev.c:698:17: warning: no previous prototype for function 'sev_jumptable_ap_park' [-Wmissing-prototypes]
   void __noreturn sev_jumptable_ap_park(void)
                   ^
   arch/x86/kernel/sev.c:698:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __noreturn sev_jumptable_ap_park(void)
   ^
   static 
   arch/x86/kernel/sev.c:803:13: warning: no previous prototype for function 'sev_es_setup_ap_jump_table_data' [-Wmissing-prototypes]
   void __init sev_es_setup_ap_jump_table_data(void *base, u32 pa)
               ^
   arch/x86/kernel/sev.c:803:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void __init sev_es_setup_ap_jump_table_data(void *base, u32 pa)
   ^
   static 
   2 warnings generated.


vim +/sev_jumptable_ap_park +698 arch/x86/kernel/sev.c

1aa9aa8ee517e0 arch/x86/kernel/sev-es.c Joerg Roedel 2020-09-08  697  
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24 @698  void __noreturn sev_jumptable_ap_park(void)
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  699  {
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  700  	local_irq_disable();
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  701  
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  702  	write_cr3(real_mode_header->trampoline_pgd);
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  703  
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  704  	/* Exiting long mode will fail if CR4.PCIDE is set. */
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  705  	if (boot_cpu_has(X86_FEATURE_PCID))
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  706  		cr4_clear_bits(X86_CR4_PCIDE);
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  707  
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  708  	asm volatile("xorq	%%r15, %%r15\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  709  		     "xorq	%%r14, %%r14\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  710  		     "xorq	%%r13, %%r13\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  711  		     "xorq	%%r12, %%r12\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  712  		     "xorq	%%r11, %%r11\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  713  		     "xorq	%%r10, %%r10\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  714  		     "xorq	%%r9,  %%r9\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  715  		     "xorq	%%r8,  %%r8\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  716  		     "xorq	%%rsi, %%rsi\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  717  		     "xorq	%%rdi, %%rdi\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  718  		     "xorq	%%rsp, %%rsp\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  719  		     "xorq	%%rbp, %%rbp\n"
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  720  		     "ljmpl	*%0" : :
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  721  		     "m" (real_mode_header->sev_real_ap_park_asm),
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  722  		     "b" (sev_es_jump_table_pa >> 4));
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  723  	unreachable();
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  724  }
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  725  STACK_FRAME_NON_STANDARD(sev_jumptable_ap_park);
700d0a170431bd arch/x86/kernel/sev.c    Joerg Roedel 2021-06-24  726  

:::::: The code at line 698 was first introduced by commit
:::::: 700d0a170431bd18f1f3e1d10befe530bce97567 x86/sev: Park APs on AP Jump Table with GHCB protocol version 2

:::::: TO: Joerg Roedel <jroedel@suse.de>
:::::: CC: Joerg Roedel <jroedel@suse.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 41427 bytes --]