Re: [RFC PATCH v3 1/1] trace,smp: Add tracepoints around remotelly called functions

[kernel test robot <lkp@intel.com>]

Hi Leonardo,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.4-rc1 next-20230510]
[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/Leonardo-Bras/trace-smp-Add-tracepoints-around-remotelly-called-functions/20230511-070554
base:   linus/master
patch link:    https://lore.kernel.org/r/20230510230128.150384-1-leobras%40redhat.com
patch subject: [RFC PATCH v3 1/1] trace,smp: Add tracepoints around remotelly called functions
config: riscv-buildonly-randconfig-r004-20230509 (https://download.01.org/0day-ci/archive/20230511/202305110816.mcNeYnWd-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project b0fb98227c90adf2536c9ad644a74d5e92961111)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/fcef1c202a1635b9c7244f06bbad605562b83d43
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Leonardo-Bras/trace-smp-Add-tracepoints-around-remotelly-called-functions/20230511-070554
        git checkout fcef1c202a1635b9c7244f06bbad605562b83d43
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305110816.mcNeYnWd-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> kernel/smp.c:389:27: warning: passing 8-byte aligned argument to 32-byte aligned parameter 3 of 'csd_do_func' may result in an unaligned pointer access [-Walign-mismatch]
                   csd_do_func(func, info, csd);
                                           ^
   1 warning generated.


vim +/csd_do_func +389 kernel/smp.c

   369	
   370	/*
   371	 * Insert a previously allocated call_single_data_t element
   372	 * for execution on the given CPU. data must already have
   373	 * ->func, ->info, and ->flags set.
   374	 */
   375	static int generic_exec_single(int cpu, struct __call_single_data *csd)
   376	{
   377		if (cpu == smp_processor_id()) {
   378			smp_call_func_t func = csd->func;
   379			void *info = csd->info;
   380			unsigned long flags;
   381	
   382			/*
   383			 * We can unlock early even for the synchronous on-stack case,
   384			 * since we're doing this from the same CPU..
   385			 */
   386			csd_lock_record(csd);
   387			csd_unlock(csd);
   388			local_irq_save(flags);
 > 389			csd_do_func(func, info, csd);
   390			csd_lock_record(NULL);
   391			local_irq_restore(flags);
   392			return 0;
   393		}
   394	
   395		if ((unsigned)cpu >= nr_cpu_ids || !cpu_online(cpu)) {
   396			csd_unlock(csd);
   397			return -ENXIO;
   398		}
   399	
   400		__smp_call_single_queue(cpu, &csd->node.llist);
   401	
   402		return 0;
   403	}
   404	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests