Hi Zheng, First bad commit (maybe != root cause): tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: cd9eb9b4365b71652b2c2ac58293bea47c9f9302 commit: 8c7d888bedbc3642dcfa0ae682bb9fb2337de170 [3541/3541] livepatch/arm64: Support livepatch without ftrace config: arm64-randconfig-001-20251212 (https://download.01.org/0day-ci/archive/20251215/202512150123.LJIfaupb-lkp@i...) compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251215/202512150123.LJIfaupb-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202512150123.LJIfaupb-lkp@intel.com/ All warnings (new ones prefixed by >>):
kernel/livepatch/core.c:1689:12: warning: no previous prototype for function 'arch_klp_check_activeness_func' [-Wmissing-prototypes] 1689 | int __weak arch_klp_check_activeness_func(struct klp_func *func, int enable, | ^ kernel/livepatch/core.c:1689:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1689 | int __weak arch_klp_check_activeness_func(struct klp_func *func, int enable, | ^ | static kernel/livepatch/core.c:1913:14: warning: no previous prototype for function 'arch_klp_mem_alloc' [-Wmissing-prototypes] 1913 | void __weak *arch_klp_mem_alloc(size_t size) | ^ kernel/livepatch/core.c:1913:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1913 | void __weak *arch_klp_mem_alloc(size_t size) | ^ | static kernel/livepatch/core.c:1918:13: warning: no previous prototype for function 'arch_klp_mem_free' [-Wmissing-prototypes] 1918 | void __weak arch_klp_mem_free(void *mem) | ^ kernel/livepatch/core.c:1918:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1918 | void __weak arch_klp_mem_free(void *mem) | ^ | static kernel/livepatch/core.c:1923:13: warning: no previous prototype for function 'arch_klp_code_modify_prepare' [-Wmissing-prototypes] 1923 | void __weak arch_klp_code_modify_prepare(void) | ^ kernel/livepatch/core.c:1923:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1923 | void __weak arch_klp_code_modify_prepare(void) | ^ | static kernel/livepatch/core.c:1927:13: warning: no previous prototype for function 'arch_klp_code_modify_post_process' [-Wmissing-prototypes] 1927 | void __weak arch_klp_code_modify_post_process(void) | ^ kernel/livepatch/core.c:1927:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1927 | void __weak arch_klp_code_modify_post_process(void) | ^ | static 5 warnings generated.
vim +/arch_klp_check_activeness_func +1689 kernel/livepatch/core.c 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1688 583e6e55fb6aa19 Zheng Yejian 2023-12-23 @1689 int __weak arch_klp_check_activeness_func(struct klp_func *func, int enable, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1690 klp_add_func_t add_func, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1691 struct list_head *func_list) 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1692 { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1693 int ret; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1694 unsigned long func_addr = 0; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1695 unsigned long func_size; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1696 struct klp_func_node *func_node = NULL; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1697 unsigned long old_func = (unsigned long)func->old_func; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1698 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1699 func_node = func->func_node; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1700 /* Check func address in stack */ 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1701 if (enable) { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1702 if (func->patched || func->force == KLP_ENFORCEMENT) 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1703 return 0; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1704 /* 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1705 * When enable, checking the currently active functions. 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1706 */ 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1707 if (list_empty(&func_node->func_stack)) { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1708 /* 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1709 * Not patched on this function [the origin one] 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1710 */ 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1711 func_addr = old_func; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1712 func_size = func->old_size; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1713 } else { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1714 /* 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1715 * Previously patched function [the active one] 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1716 */ 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1717 struct klp_func *prev; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1718 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1719 prev = list_first_or_null_rcu(&func_node->func_stack, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1720 struct klp_func, stack_node); 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1721 func_addr = (unsigned long)prev->new_func; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1722 func_size = prev->new_size; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1723 } 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1724 /* 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1725 * When preemption is disabled and the replacement area 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1726 * does not contain a jump instruction, the migration 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1727 * thread is scheduled to run stop machine only after the 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1728 * execution of instructions to be replaced is complete. 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1729 */ 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1730 if (IS_ENABLED(CONFIG_PREEMPTION) || 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1731 (func->force == KLP_NORMAL_FORCE) || 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1732 arch_check_jump_insn(func_addr)) { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1733 ret = add_func(func_list, func_addr, func_size, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1734 func->old_name, func->force); 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1735 if (ret) 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1736 return ret; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1737 if (func_addr != old_func) { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1738 ret = add_func(func_list, old_func, KLP_MAX_REPLACE_SIZE, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1739 func->old_name, func->force); 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1740 if (ret) 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1741 return ret; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1742 } 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1743 } 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1744 } else { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1745 #ifdef CONFIG_PREEMPTION 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1746 /* 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1747 * No scheduling point in the replacement instructions. Therefore, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1748 * when preemption is not enabled, atomic execution is performed 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1749 * and these instructions will not appear on the stack. 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1750 */ 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1751 if (list_is_singular(&func_node->func_stack)) { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1752 func_addr = old_func; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1753 func_size = func->old_size; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1754 } else { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1755 struct klp_func *prev; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1756 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1757 prev = list_first_or_null_rcu( 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1758 &func_node->func_stack, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1759 struct klp_func, stack_node); 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1760 func_addr = (unsigned long)prev->new_func; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1761 func_size = prev->new_size; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1762 } 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1763 ret = add_func(func_list, func_addr, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1764 func_size, func->old_name, 0); 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1765 if (ret) 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1766 return ret; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1767 if (func_addr != old_func) { 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1768 ret = add_func(func_list, old_func, KLP_MAX_REPLACE_SIZE, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1769 func->old_name, 0); 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1770 if (ret) 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1771 return ret; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1772 } 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1773 #endif 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1774 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1775 func_addr = (unsigned long)func->new_func; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1776 func_size = func->new_size; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1777 ret = add_func(func_list, func_addr, 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1778 func_size, func->old_name, 0); 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1779 if (ret) 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1780 return ret; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1781 } 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1782 return 0; 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1783 } 583e6e55fb6aa19 Zheng Yejian 2023-12-23 1784 :::::: The code at line 1689 was first introduced by commit :::::: 583e6e55fb6aa193b1a82909069e8028c5d5653d livepatch/x86: Support livepatch without ftrace :::::: TO: Zheng Yejian <zhengyejian1@huawei.com> :::::: CC: Zheng Yejian <zhengyejian1@huawei.com> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki