Hi Steven, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on akpm-mm/mm-everything] [also build test WARNING on linus/master v6.2-rc3 next-20230111] [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-Add-creation-of-instances-at-boot-command-line/20230111-230425 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20230111145842.847715402%40goodmis.org patch subject: [PATCH 4/4] tracing: Allow boot instances to have snapshot buffers config: i386-randconfig-s001 compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-39-gce1a6720-dirty # https://github.com/intel-lab-lkp/linux/commit/b4515aa1407184147348b74b42bf10af90b905e7 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Steven-Rostedt/tracing-Add-creation-of-instances-at-boot-command-line/20230111-230425 git checkout b4515aa1407184147348b74b42bf10af90b905e7 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 olddefconfig make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash kernel/trace/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot sparse warnings: (new ones prefixed by >>) kernel/trace/trace.c:5809:1: sparse: sparse: trying to concatenate 11905-character string (8191 bytes max) kernel/trace/trace.c:444:28: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct trace_export **list @@ got struct trace_export [noderef] __rcu ** @@ kernel/trace/trace.c:444:28: sparse: expected struct trace_export **list kernel/trace/trace.c:444:28: sparse: got struct trace_export [noderef] __rcu ** kernel/trace/trace.c:458:33: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct trace_export **list @@ got struct trace_export [noderef] __rcu ** @@ kernel/trace/trace.c:458:33: sparse: expected struct trace_export **list kernel/trace/trace.c:458:33: sparse: got struct trace_export [noderef] __rcu ** kernel/trace/trace.c:2934:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct event_filter *filter @@ got struct event_filter [noderef] __rcu *filter @@ kernel/trace/trace.c:2934:38: sparse: expected struct event_filter *filter kernel/trace/trace.c:2934:38: sparse: got struct event_filter [noderef] __rcu *filter >> kernel/trace/trace.c:10208:51: sparse: sparse: Using plain integer as NULL pointer kernel/trace/trace.c:398:9: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/trace/trace.c:398:9: sparse: struct trace_export [noderef] __rcu * kernel/trace/trace.c:398:9: sparse: struct trace_export * kernel/trace/trace.c:413:9: sparse: sparse: incompatible types in comparison expression (different address spaces): kernel/trace/trace.c:413:9: sparse: struct trace_export [noderef] __rcu * kernel/trace/trace.c:413:9: sparse: struct trace_export * vim +10208 kernel/trace/trace.c 10188 10189 #ifdef CONFIG_TRACER_MAX_TRACE 10190 __init static bool tr_needs_alloc_snapshot(const char *name) 10191 { 10192 char *test; 10193 int len = strlen(name); 10194 bool ret; 10195 10196 if (!boot_snapshot_index) 10197 return false; 10198 10199 if (strncmp(name, boot_snapshot_info, len) == 0 && 10200 boot_snapshot_info[len] == '\t') 10201 return true; 10202 10203 test = kmalloc(strlen(name) + 3, GFP_KERNEL); 10204 if (!test) 10205 return false; 10206 10207 sprintf(test, "\t%s\t", name); 10208 ret = strstr(boot_snapshot_info, test) == 0; 10209 kfree(test); 10210 return ret; 10211 } 10212 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests