Messages in this thread | | | Date | Sat, 3 Jul 2021 06:03:58 +0800 | From | kernel test robot <> | Subject | [joro:sev-es-kexec 7/12] arch/x86/kernel/sev.c:762:13: warning: no previous prototype for 'sev_es_setup_ap_jump_table_data' |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/joro/linux.git sev-es-kexec head: 3467dc3cdbe65c619cd9b5c8db47da63b0655300 commit: 2740e3cdcb62ce9ce27839885b033c3d1f647710 [7/12] x86/sev: Setup code to park APs in the AP Jump Table 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=2740e3cdcb62ce9ce27839885b033c3d1f647710 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 2740e3cdcb62ce9ce27839885b033c3d1f647710 # 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@intel.com>
All warnings (new ones prefixed by >>):
>> arch/x86/kernel/sev.c:762:13: warning: no previous prototype for 'sev_es_setup_ap_jump_table_data' [-Wmissing-prototypes] 762 | void __init sev_es_setup_ap_jump_table_data(void *base, u32 pa) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
vim +/sev_es_setup_ap_jump_table_data +762 arch/x86/kernel/sev.c
755 756 /* 757 * This function make the necessary runtime changes to the AP Jump Table blob. 758 * For now this only sets up the GDT used while the code executes. The GDT needs 759 * to contain 16-bit code and data segments with a base that points to AP Jump 760 * Table page. 761 */ > 762 void __init sev_es_setup_ap_jump_table_data(void *base, u32 pa) 763 { 764 struct sev_ap_jump_table_header *header; 765 struct desc_ptr *gdt_descr; 766 u64 *ap_jumptable_gdt; 767 768 header = base; 769 770 /* 771 * Setup 16-bit protected mode code and data segments for AP Jumptable. 772 * Set the segment limits to 0xffff to already be compatible with 773 * real-mode. 774 */ 775 ap_jumptable_gdt = (u64 *)(base + header->gdt_offset); 776 ap_jumptable_gdt[SEV_APJT_CS16 / 8] = GDT_ENTRY(0x9b, pa, 0xffff); 777 ap_jumptable_gdt[SEV_APJT_DS16 / 8] = GDT_ENTRY(0x93, pa, 0xffff); 778 779 /* Write correct GDT base address into GDT descriptor */ 780 gdt_descr = (struct desc_ptr *)(base + header->gdt_offset); 781 gdt_descr->address += pa; 782 } 783
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