On Fri, 24 Nov 2023 23:40:57 +0800 kernel test robot <lkp@xxxxxxxxx> wrote: > Hi Masami, > > kernel test robot noticed the following build warnings: > > [auto build test WARNING on linus/master] > [also build test WARNING on v6.7-rc2 next-20231124] > [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/Masami-Hiramatsu-Google/rethook-Use-__rcu-pointer-for-rethook-handler/20231124-090634 > base: linus/master > patch link: https://lore.kernel.org/r/170078778632.209874.7893551840863388753.stgit%40devnote2 > patch subject: [PATCH] rethook: Use __rcu pointer for rethook::handler > config: x86_64-randconfig-r113-20231124 (https://download.01.org/0day-ci/archive/20231124/202311241808.rv9ceuAh-lkp@xxxxxxxxx/config) > compiler: clang version 16.0.4 (https://github.com/llvm/llvm-project.git ae42196bc493ffe877a7e3dff8be32035dea4d07) > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231124/202311241808.rv9ceuAh-lkp@xxxxxxxxx/reproduce) Let me fix this issue. It seems that sparse with function pointer needs a special care. Thank you, > > 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@xxxxxxxxx> > | Closes: https://lore.kernel.org/oe-kbuild-all/202311241808.rv9ceuAh-lkp@xxxxxxxxx/ > > sparse warnings: (new ones prefixed by >>) > >> kernel/trace/rethook.c:51:9: sparse: sparse: incompatible types in comparison expression (different address spaces): > >> kernel/trace/rethook.c:51:9: sparse: void ( [noderef] __rcu * )( ... ) > >> kernel/trace/rethook.c:51:9: sparse: void ( * )( ... ) > kernel/trace/rethook.c:66:9: sparse: sparse: incompatible types in comparison expression (different address spaces): > kernel/trace/rethook.c:66:9: sparse: void ( [noderef] __rcu * )( ... ) > kernel/trace/rethook.c:66:9: sparse: void ( * )( ... ) > kernel/trace/rethook.c:110:9: sparse: sparse: incompatible types in comparison expression (different address spaces): > kernel/trace/rethook.c:110:9: sparse: void ( [noderef] __rcu * )( ... ) > kernel/trace/rethook.c:110:9: sparse: void ( * )( ... ) > kernel/trace/rethook.c:140:19: sparse: sparse: incompatible types in comparison expression (different address spaces): > kernel/trace/rethook.c:140:19: sparse: void ( [noderef] __rcu * )( ... ) > kernel/trace/rethook.c:140:19: sparse: void ( * )( ... ) > kernel/trace/rethook.c:161:19: sparse: sparse: incompatible types in comparison expression (different address spaces): > kernel/trace/rethook.c:161:19: sparse: void ( [noderef] __rcu * )( ... ) > kernel/trace/rethook.c:161:19: sparse: void ( * )( ... ) > kernel/trace/rethook.c:305:27: sparse: sparse: incompatible types in comparison expression (different address spaces): > kernel/trace/rethook.c:305:27: sparse: void ( [noderef] __rcu * )( ... ) > kernel/trace/rethook.c:305:27: sparse: void ( * )( ... ) > > vim +51 kernel/trace/rethook.c > > 40 > 41 /** > 42 * rethook_stop() - Stop using a rethook. > 43 * @rh: the struct rethook to stop. > 44 * > 45 * Stop using a rethook to prepare for freeing it. If you want to wait for > 46 * all running rethook handler before calling rethook_free(), you need to > 47 * call this first and wait RCU, and call rethook_free(). > 48 */ > 49 void rethook_stop(struct rethook *rh) > 50 { > > 51 rcu_assign_pointer(rh->handler, NULL); > 52 } > 53 > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki -- Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
