Re: [PATCH v11 1/4] trace: Add trace any kernel object

From: Jeff Xie
Date: Thu Jun 02 2022 - 21:48:26 EST

Hi lkp,

On Fri, Jun 3, 2022 at 5:12 AM kernel test robot <lkp@xxxxxxxxx> wrote:
>
> Hi Jeff,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on b39181f7c6907dc66ff937b74758671fa6ba430c]
>
> url: https://github.com/intel-lab-lkp/linux/commits/Jeff-Xie/trace-Introduce-objtrace-trigger-to-trace-the-kernel-object/20220603-004723
> base: b39181f7c6907dc66ff937b74758671fa6ba430c
> config: i386-randconfig-a013 (https://download.01.org/0day-ci/archive/20220603/202206030515.4lqqkb3W-lkp@xxxxxxxxx/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project b364c76683f8ef241025a9556300778c07b590c2)
> 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
> # https://github.com/intel-lab-lkp/linux/commit/765253f020469f94856aedc5a3fe5444e1e8f4e8
> git remote add linux-review https://github.com/intel-lab-lkp/linux
> git fetch --no-tags linux-review Jeff-Xie/trace-Introduce-objtrace-trigger-to-trace-the-kernel-object/20220603-004723
> git checkout 765253f020469f94856aedc5a3fe5444e1e8f4e8
> # 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=i386 SHELL=/bin/bash drivers/gpu/drm/qxl/ kernel/trace/
>
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>
> All warnings (new ones prefixed by >>):
>
> >> kernel/trace/trace_object.c:336:61: warning: format specifies type 'long' but the argument has type 'unsigned int' [-Wformat]
> pr_err("the size of the %s should be:%ld\n", field->name, sizeof(void *));
> ~~~ ^~~~~~~~~~~~~~
> %u

I will double check it ,the sizeof(void *) on x86_64 is type ‘long
unsigned int’.

> include/linux/printk.h:489:33: note: expanded from macro 'pr_err'
> printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
> ~~~ ^~~~~~~~~~~
> include/linux/printk.h:446:60: note: expanded from macro 'printk'
> #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__)
> ~~~ ^~~~~~~~~~~
> include/linux/printk.h:418:19: note: expanded from macro 'printk_index_wrap'
> _p_func(_fmt, ##__VA_ARGS__); \
> ~~~~ ^~~~~~~~~~~
> 1 warning generated.
>
>
> vim +336 kernel/trace/trace_object.c
>
> 297
> 298 static int
> 299 event_object_trigger_parse(struct event_command *cmd_ops,
> 300 struct trace_event_file *file,
> 301 char *glob, char *cmd, char *param_and_filter)
> 302 {
> 303 struct event_trigger_data *trigger_data;
> 304 struct objtrace_trigger_data *obj_data;
> 305 struct ftrace_event_field *field;
> 306 char *objtrace_cmd, *arg;
> 307 char *param, *filter;
> 308 int ret;
> 309 bool remove;
> 310
> 311 remove = event_trigger_check_remove(glob);
> 312
> 313 /*
> 314 * separate the param and the filter:
> 315 * objtrace:add:OBJ[:COUNT] [if filter]
> 316 */
> 317 ret = event_trigger_separate_filter(param_and_filter, &param, &filter, true);
> 318 if (ret)
> 319 return ret;
> 320
> 321 objtrace_cmd = strsep(&param, ":");
> 322 if (!objtrace_cmd || strcmp(objtrace_cmd, OBJTRACE_CMD_ADD)) {
> 323 pr_err("error objtrace command\n");
> 324 return -EINVAL;
> 325 }
> 326
> 327 arg = strsep(&param, ":");
> 328 if (!arg)
> 329 return -EINVAL;
> 330
> 331 field = trace_find_event_field(file->event_call, arg);
> 332 if (!field)
> 333 return -EINVAL;
> 334
> 335 if (field->size != sizeof(void *)) {
> > 336 pr_err("the size of the %s should be:%ld\n", field->name, sizeof(void *));
> 337 return -EINVAL;
> 338 }
> 339
> 340 if (remove && !field_exist(file, cmd_ops, field->name))
> 341 return -ENOENT;
> 342
> 343 obj_data = kzalloc(sizeof(*obj_data), GFP_KERNEL);
> 344 if (!obj_data)
> 345 return -ENOMEM;
> 346
> 347 obj_data->field = field;
> 348 obj_data->tr = file->tr;
> 349 snprintf(obj_data->objtrace_cmd, OBJTRACE_CMD_LEN, objtrace_cmd);
> 350
> 351 trigger_data = event_trigger_alloc(cmd_ops, cmd, param, obj_data);
> 352 if (!trigger_data) {
> 353 kfree(obj_data);
> 354 return -ENOMEM;
> 355 }
> 356 if (remove) {
> 357 event_trigger_unregister(cmd_ops, file, glob+1, trigger_data);
> 358 kfree(obj_data);
> 359 kfree(trigger_data);
> 360 return 0;
> 361 }
> 362
> 363 ret = event_trigger_parse_num(param, trigger_data);
> 364 if (ret)
> 365 goto out_free;
> 366
> 367 ret = event_trigger_set_filter(cmd_ops, file, filter, trigger_data);
> 368 if (ret < 0)
> 369 goto out_free;
> 370
> 371 ret = event_trigger_register(cmd_ops, file, glob, trigger_data);
> 372 if (ret)
> 373 goto out_free;
> 374
> 375 return ret;
> 376
> 377 out_free:
> 378 event_trigger_reset_filter(cmd_ops, trigger_data);
> 379 kfree(obj_data);
> 380 kfree(trigger_data);
> 381 return ret;
> 382 }
> 383
>
> --
> 0-DAY CI Kernel Test Service
> https://01.org/lkp

Thanks,
JeffXie