Re: [PATCH] tracing: Fix event probe removal from dynamic events

[kernel test robot]

Hi Steven,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on hnaz-mm/master linus/master v5.15-rc5 next-20211011]
[cannot apply to tip/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]

url:    https://github.com/0day-ci/linux/commits/Steven-Rostedt/tracing-Fix-event-probe-removal-from-dynamic-events/20211012-091238
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5816b3e6577eaa676ceb00a848f0fd65fe2adc29
config: arm64-randconfig-r005-20211011 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c3dcf39554dbea780d6cb7e12239451ba47a2668)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/0day-ci/linux/commit/4d930af6a4aa75558017f921e2c9692ed27b2c56
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Steven-Rostedt/tracing-Fix-event-probe-removal-from-dynamic-events/20211012-091238
        git checkout 4d930af6a4aa75558017f921e2c9692ed27b2c56
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash kernel/trace/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> kernel/trace/trace_eprobe.c:128:2: error: use of undeclared identifier 'slash'
           slash = strchr(argv[0], '/');
           ^
   kernel/trace/trace_eprobe.c:129:7: error: use of undeclared identifier 'slash'
           if (!slash)
                ^
   kernel/trace/trace_eprobe.c:130:3: error: use of undeclared identifier 'slash'
                   slash = strchr(argv[0], '.');
                   ^
   kernel/trace/trace_eprobe.c:131:7: error: use of undeclared identifier 'slash'
           if (!slash)
                ^
   kernel/trace/trace_eprobe.c:134:41: error: use of undeclared identifier 'slash'
           if (strncmp(ep->event_system, argv[0], slash - argv[0]))
                                                  ^
   kernel/trace/trace_eprobe.c:136:29: error: use of undeclared identifier 'slash'
           if (strcmp(ep->event_name, slash + 1))
                                      ^
   6 errors generated.


vim +/slash +128 kernel/trace/trace_eprobe.c

   117	
   118	static bool eprobe_dyn_event_match(const char *system, const char *event,
   119				int argc, const char **argv, struct dyn_event *ev)
   120	{
   121		struct trace_eprobe *ep = to_trace_eprobe(ev);
   122	
   123		/* First argument is the system/event the probe is attached to */
   124	
   125		if (argc < 1)
   126			return false;
   127	
 > 128		slash = strchr(argv[0], '/');
   129		if (!slash)
   130			slash = strchr(argv[0], '.');
   131		if (!slash)
   132			return false;
   133	
   134		if (strncmp(ep->event_system, argv[0], slash - argv[0]))
   135			return false;
   136		if (strcmp(ep->event_name, slash + 1))
   137			return false;
   138	
   139		argc--;
   140		argv++;
   141	
   142		return strcmp(trace_probe_name(&ep->tp), event) == 0 &&
   143		    (!system || strcmp(trace_probe_group_name(&ep->tp), system) == 0) &&
   144		    trace_probe_match_command_args(&ep->tp, argc, argv);
   145	}
   146	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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