linux-kernel - [joro:sev-es-kexec 8/12] arch/x86/kernel/sev.c:699:17: warning: no previous prototype for 'sev_jumptable_ap

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Message-ID: <202107030720.H2X5Jhfn-lkp@intel.com>
Date:   Sat, 3 Jul 2021 07:26:27 +0800
From:   kernel test robot <lkp@...el.com>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [joro:sev-es-kexec 8/12] arch/x86/kernel/sev.c:699:17: warning: no
 previous prototype for 'sev_jumptable_ap_park'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-kexec
head:   3467dc3cdbe65c619cd9b5c8db47da63b0655300
commit: 700d0a170431bd18f1f3e1d10befe530bce97567 [8/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2
config: x86_64-allyesconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git/commit/?id=700d0a170431bd18f1f3e1d10befe530bce97567
        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 700d0a170431bd18f1f3e1d10befe530bce97567
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/sev.c:699:17: warning: no previous prototype for 'sev_jumptable_ap_park' [-Wmissing-prototypes]
     699 | void __noreturn sev_jumptable_ap_park(void)
         |                 ^~~~~~~~~~~~~~~~~~~~~
   arch/x86/kernel/sev.c:794:13: warning: no previous prototype for 'sev_es_setup_ap_jump_table_data' [-Wmissing-prototypes]
     794 | void __init sev_es_setup_ap_jump_table_data(void *base, u32 pa)
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/sev_jumptable_ap_park +699 arch/x86/kernel/sev.c

   697	
   698	#ifdef CONFIG_HOTPLUG_CPU
 > 699	void __noreturn sev_jumptable_ap_park(void)
   700	{
   701		local_irq_disable();
   702	
   703		write_cr3(real_mode_header->trampoline_pgd);
   704	
   705		/* Exiting long mode will fail if CR4.PCIDE is set. */
   706		if (boot_cpu_has(X86_FEATURE_PCID))
   707			cr4_clear_bits(X86_CR4_PCIDE);
   708	
   709		asm volatile("xorq	%%r15, %%r15\n"
   710			     "xorq	%%r14, %%r14\n"
   711			     "xorq	%%r13, %%r13\n"
   712			     "xorq	%%r12, %%r12\n"
   713			     "xorq	%%r11, %%r11\n"
   714			     "xorq	%%r10, %%r10\n"
   715			     "xorq	%%r9,  %%r9\n"
   716			     "xorq	%%r8,  %%r8\n"
   717			     "xorq	%%rsi, %%rsi\n"
   718			     "xorq	%%rdi, %%rdi\n"
   719			     "xorq	%%rsp, %%rsp\n"
   720			     "xorq	%%rbp, %%rbp\n"
   721			     "ljmpl	*%0" : :
   722			     "m" (real_mode_header->sev_real_ap_park_asm),
   723			     "b" (sev_es_jump_table_pa >> 4));
   724		unreachable();
   725	}
   726	STACK_FRAME_NON_STANDARD(sev_jumptable_ap_park);
   727	

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

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