tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 1b4212c630731d88b07d5b6e28ecaff1a76d3839 commit: 583e6e55fb6aa193b1a82909069e8028c5d5653d [1770/6857] livepatch/x86: Support livepatch without ftrace config: x86_64-randconfig-015-20240323 (https://download.01.org/0day-ci/archive/20240323/202403231944.DuQR0aQA-lkp@i...) compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240323/202403231944.DuQR0aQA-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/202403231944.DuQR0aQA-lkp@intel.com/ All warnings (new ones prefixed by >>):

...

kernel/livepatch/core.c:1587:12: warning: no previous prototype for function 'arch_klp_check_activeness_func' [-Wmissing-prototypes] 1587 | int __weak arch_klp_check_activeness_func(struct klp_func *func, int enable, | ^ kernel/livepatch/core.c:1587:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1587 | int __weak arch_klp_check_activeness_func(struct klp_func *func, int enable, | ^ | static kernel/livepatch/core.c:1811:14: warning: no previous prototype for function 'arch_klp_mem_alloc' [-Wmissing-prototypes] 1811 | void __weak *arch_klp_mem_alloc(size_t size) | ^ kernel/livepatch/core.c:1811:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1811 | void __weak *arch_klp_mem_alloc(size_t size) | ^ | static kernel/livepatch/core.c:1816:13: warning: no previous prototype for function 'arch_klp_mem_free' [-Wmissing-prototypes] 1816 | void __weak arch_klp_mem_free(void *mem) | ^ kernel/livepatch/core.c:1816:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 1816 | void __weak arch_klp_mem_free(void *mem) | ^ | static 3 warnings generated.

vim +/arch_klp_check_activeness_func +1587 kernel/livepatch/core.c 1586

1587 int __weak arch_klp_check_activeness_func(struct klp_func *func, int enable, 1588 klp_add_func_t add_func, 1589 struct list_head *func_list) 1590 { 1591 int ret; 1592 unsigned long func_addr = 0; 1593 unsigned long func_size; 1594 struct klp_func_node *func_node = NULL; 1595 unsigned long old_func = (unsigned long)func->old_func; 1596 1597 func_node = func->func_node; 1598 /* Check func address in stack */ 1599 if (enable) { 1600 if (func->patched || func->force == KLP_ENFORCEMENT) 1601 return 0; 1602 /* 1603 * When enable, checking the currently active functions. 1604 */ 1605 if (list_empty(&func_node->func_stack)) { 1606 /* 1607 * Not patched on this function [the origin one] 1608 */ 1609 func_addr = old_func; 1610 func_size = func->old_size; 1611 } else { 1612 /* 1613 * Previously patched function [the active one] 1614 */ 1615 struct klp_func *prev; 1616 1617 prev = list_first_or_null_rcu(&func_node->func_stack, 1618 struct klp_func, stack_node); 1619 func_addr = (unsigned long)prev->new_func; 1620 func_size = prev->new_size; 1621 } 1622 /* 1623 * When preemption is disabled and the replacement area 1624 * does not contain a jump instruction, the migration 1625 * thread is scheduled to run stop machine only after the 1626 * execution of instructions to be replaced is complete. 1627 */ 1628 if (IS_ENABLED(CONFIG_PREEMPTION) || 1629 (func->force == KLP_NORMAL_FORCE) || 1630 arch_check_jump_insn(func_addr)) { 1631 ret = add_func(func_list, func_addr, func_size, 1632 func->old_name, func->force); 1633 if (ret) 1634 return ret; 1635 if (func_addr != old_func) { 1636 ret = add_func(func_list, old_func, KLP_MAX_REPLACE_SIZE, 1637 func->old_name, func->force); 1638 if (ret) 1639 return ret; 1640 } 1641 } 1642 } else { 1643 #ifdef CONFIG_PREEMPTION 1644 /* 1645 * No scheduling point in the replacement instructions. Therefore, 1646 * when preemption is not enabled, atomic execution is performed 1647 * and these instructions will not appear on the stack. 1648 */ 1649 if (list_is_singular(&func_node->func_stack)) { 1650 func_addr = old_func; 1651 func_size = func->old_size; 1652 } else { 1653 struct klp_func *prev; 1654 1655 prev = list_first_or_null_rcu( 1656 &func_node->func_stack, 1657 struct klp_func, stack_node); 1658 func_addr = (unsigned long)prev->new_func; 1659 func_size = prev->new_size; 1660 } 1661 ret = add_func(func_list, func_addr, 1662 func_size, func->old_name, 0); 1663 if (ret) 1664 return ret; 1665 if (func_addr != old_func) { 1666 ret = add_func(func_list, old_func, KLP_MAX_REPLACE_SIZE, 1667 func->old_name, 0); 1668 if (ret) 1669 return ret; 1670 } 1671 #endif 1672 1673 func_addr = (unsigned long)func->new_func; 1674 func_size = func->new_size; 1675 ret = add_func(func_list, func_addr, 1676 func_size, func->old_name, 0); 1677 if (ret) 1678 return ret; 1679 } 1680 return 0; 1681 } 1682

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