Hi Steven, kernel test robot noticed the following build warnings:
[auto build test WARNING on akpm-mm/mm-everything] [also build test WARNING on linus/master v6.18-rc1 next-20251015] [cannot apply to trace/for-next acme/perf/core] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Steven-Rostedt/tracing-Make-trace_user_fault_read-exposed-to-rest-of-tracing/20251016-014059 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20251015173548.540984239%40kernel.org patch subject: [PATCH v3 03/13] perf: tracing: Simplify perf_sysenter_enable/disable() with guards config: x86_64-randconfig-r073-20251016 (https://download.01.org/0day-ci/archive/20251016/[email protected]/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251016/[email protected]/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 <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): >> kernel/trace/trace_syscalls.c:1018:6: warning: variable 'ret' is used >> uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] 1018 | if (!sys_perf_refcount_enter) { | ^~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_syscalls.c:1027:9: note: uninitialized use occurs here 1027 | return ret; | ^~~ kernel/trace/trace_syscalls.c:1018:2: note: remove the 'if' if its condition is always true 1018 | if (!sys_perf_refcount_enter) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_syscalls.c:1012:9: note: initialize the variable 'ret' to silence this warning 1012 | int ret; | ^ | = 0 kernel/trace/trace_syscalls.c:1123:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized] 1123 | if (!sys_perf_refcount_exit) { | ^~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_syscalls.c:1132:9: note: uninitialized use occurs here 1132 | return ret; | ^~~ kernel/trace/trace_syscalls.c:1123:2: note: remove the 'if' if its condition is always true 1123 | if (!sys_perf_refcount_exit) { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/trace_syscalls.c:1117:9: note: initialize the variable 'ret' to silence this warning 1117 | int ret; | ^ | = 0 2 warnings generated. vim +1018 kernel/trace/trace_syscalls.c 1009 1010 static int perf_sysenter_enable(struct trace_event_call *call) 1011 { 1012 int ret; 1013 int num; 1014 1015 num = ((struct syscall_metadata *)call->data)->syscall_nr; 1016 1017 guard(mutex)(&syscall_trace_lock); > 1018 if (!sys_perf_refcount_enter) { 1019 ret = register_trace_sys_enter(perf_syscall_enter, NULL); 1020 if (ret) { 1021 pr_info("event trace: Could not activate syscall entry trace point"); 1022 return ret; 1023 } 1024 } 1025 set_bit(num, enabled_perf_enter_syscalls); 1026 sys_perf_refcount_enter++; 1027 return ret; 1028 } 1029 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
