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charset=us-ascii Content-Disposition: inline tree: https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git topic/fprobe-on-fgraph head: 45b6f29f12043a3d5cb155ac4e09fa61229ebb00 commit: e71b9c51db1c3f9c80041c2c90b66f04ea7c27e1 [18/19] ftrace: Add ftrace_get_symaddr to convert fentry_ip to symaddr config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20241109/202411091642.i8f92qD9-lkp@intel.com/config) compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241109/202411091642.i8f92qD9-lkp@intel.com/reproduce) 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 | Closes: https://lore.kernel.org/oe-kbuild-all/202411091642.i8f92qD9-lkp@intel.com/ All warnings (new ones prefixed by >>): In file included from arch/arm64/kernel/ftrace.c:9: In file included from include/linux/ftrace.h:13: In file included from include/linux/kallsyms.h:13: In file included from include/linux/mm.h:2213: include/linux/vmstat.h:504:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 504 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 505 | item]; | ~~~~ include/linux/vmstat.h:511:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 511 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 512 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion] 518 | return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_" | ~~~~~~~~~~~ ^ ~~~ include/linux/vmstat.h:524:43: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum numa_stat_item') [-Wenum-enum-conversion] 524 | return vmstat_text[NR_VM_ZONE_STAT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~ ^ 525 | NR_VM_NUMA_EVENT_ITEMS + | ~~~~~~~~~~~~~~~~~~~~~~ >> arch/arm64/kernel/ftrace.c:147:15: warning: no previous prototype for function 'arch_ftrace_get_symaddr' [-Wmissing-prototypes] 147 | unsigned long arch_ftrace_get_symaddr(unsigned long fentry_ip) | ^ arch/arm64/kernel/ftrace.c:147:1: note: declare 'static' if the function is not intended to be used outside of this translation unit 147 | unsigned long arch_ftrace_get_symaddr(unsigned long fentry_ip) | ^ | static 5 warnings generated. vim +/arch_ftrace_get_symaddr +147 arch/arm64/kernel/ftrace.c 145 146 /* Convert fentry_ip to the symbol address without kallsyms */ > 147 unsigned long arch_ftrace_get_symaddr(unsigned long fentry_ip) 148 { 149 u32 insn; 150 151 /* 152 * When using patchable-function-entry without pre-function NOPS, ftrace 153 * entry is the address of the first NOP after the function entry point. 154 * 155 * The compiler has either generated: 156 * 157 * func+00: func: NOP // To be patched to MOV X9, LR 158 * func+04: NOP // To be patched to BL 159 * 160 * Or: 161 * 162 * func-04: BTI C 163 * func+00: func: NOP // To be patched to MOV X9, LR 164 * func+04: NOP // To be patched to BL 165 * 166 * The fentry_ip is the address of `BL ` which is at `func + 4` 167 * bytes in either case. 168 */ 169 if (!IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS)) 170 return fentry_ip - AARCH64_INSN_SIZE; 171 172 /* 173 * When using patchable-function-entry with pre-function NOPs, BTI is 174 * a bit different. 175 * 176 * func+00: func: NOP // To be patched to MOV X9, LR 177 * func+04: NOP // To be patched to BL 178 * 179 * Or: 180 * 181 * func+00: func: BTI C 182 * func+04: NOP // To be patched to MOV X9, LR 183 * func+08: NOP // To be patched to BL 184 * 185 * The fentry_ip is the address of `BL ` which is at either 186 * `func + 4` or `func + 8` depends on whether there is a BTI. 187 */ 188 189 /* If there is no BTI, the func address should be one instruction before. */ 190 if (!IS_ENABLED(CONFIG_ARM64_BTI_KERNEL)) 191 return fentry_ip - AARCH64_INSN_SIZE; 192 193 /* We want to be extra safe in case entry ip is on the page edge, 194 * but otherwise we need to avoid get_kernel_nofault()'s overhead. 195 */ 196 if ((fentry_ip & ~PAGE_MASK) < AARCH64_INSN_SIZE * 2) { 197 if (get_kernel_nofault(insn, (u32 *)(fentry_ip - AARCH64_INSN_SIZE * 2))) 198 return 0; 199 } else { 200 insn = *(u32 *)(fentry_ip - AARCH64_INSN_SIZE * 2); 201 } 202 203 if (aarch64_insn_is_bti(le32_to_cpu((__le32)insn))) 204 return fentry_ip - AARCH64_INSN_SIZE * 2; 205 206 return fentry_ip - AARCH64_INSN_SIZE; 207 } 208 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki