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

From: kernel test robot
Date: Tue Jul 06 2021 - 00:50:22 EST

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@xxxxxxxxx>

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@xxxxxxx>
:::::: CC: Joerg Roedel <jroedel@xxxxxxx>

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

Attachment: .config.gz
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