Messages in this thread | | | Date | Thu, 21 Jul 2022 18:11:13 +0800 | From | kernel test robot <> | Subject | [ammarfaizi2-block:tglx/devel/depthtracking 2/45] arch/x86/kernel/cpu/common.c:760:23: error: call to undeclared function 'cpu_kernelmode_gs_base'; ISO C99 and later do not support implicit function declarations |
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tree: https://github.com/ammarfaizi2/linux-block tglx/devel/depthtracking head: 714d29e3e7e3faac27142424ae2533163ddd3a46 commit: 3adc8d7057cc2f5e8dbbaa4b7d8b68f94dadb6ad [2/45] x86/cpu: Remove segment load from switch_to_new_gdt() config: i386-randconfig-a003-20220718 (https://download.01.org/0day-ci/archive/20220721/202207211807.FC1G4J9o-lkp@intel.com/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project dd5635541cd7bbd62cd59b6694dfb759b6e9a0d8) 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 # https://github.com/ammarfaizi2/linux-block/commit/3adc8d7057cc2f5e8dbbaa4b7d8b68f94dadb6ad git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block tglx/devel/depthtracking git checkout 3adc8d7057cc2f5e8dbbaa4b7d8b68f94dadb6ad # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/
If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
>> arch/x86/kernel/cpu/common.c:760:23: error: call to undeclared function 'cpu_kernelmode_gs_base'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] wrmsrl(MSR_GS_BASE, cpu_kernelmode_gs_base(cpu)); ^ 1 error generated.
vim +/cpu_kernelmode_gs_base +760 arch/x86/kernel/cpu/common.c
730 731 /** 732 * switch_to_new_gdt - Switch form early GDT to the direct one 733 * @cpu: The CPU number for which this is invoked 734 * 735 * Invoked during early boot to switch from early GDT and early per CPU 736 * (%fs on 32bit, GS_BASE on 64bit) to the direct GDT and the runtime per 737 * CPU area. 738 */ 739 void switch_to_new_gdt(int cpu) 740 { 741 load_direct_gdt(cpu); 742 743 /* 744 * No need to load the %gs (%fs for 32bit) segment. It is already 745 * correct, %gs is 0 on 64bit and %fs is __KERNEL_PERCPU on 32 bit. 746 * 747 * Writing %gs on 64bit would zero GSBASE which would make any per 748 * CPU operation up to the point of the wrmsrl() fault. 749 * 750 * 64bit requires to point GSBASE to the new offset. Until the 751 * wrmsrl() happens the early mapping is still valid. That means 752 * the GSBASE update will lose any prior per CPU data which was 753 * not copied over in setup_per_cpu_areas(). 754 * 755 * For secondary CPUs this is not a problem because they start 756 * already with the direct GDT and the real GSBASE. This invocation 757 * is pointless and will be removed in a subsequent step. 758 */ 759 if (IS_ENABLED(CONFIG_X86_64)) > 760 wrmsrl(MSR_GS_BASE, cpu_kernelmode_gs_base(cpu)); 761 } 762
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