linux-kernel - [trace:ftrace/core 35/39] kernel/trace/trace_boot.c:418:17: warning: this 'if' clause does not guard...

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Date:   Tue, 31 Aug 2021 20:57:56 +0800
From:   kernel test robot <lkp@...el.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [trace:ftrace/core 35/39] kernel/trace/trace_boot.c:418:17: warning:
 this 'if' clause does not guard...

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git ftrace/core
head:   3dc65994e3c1c999be3d991cdc96705e167cb3b1
commit: 5d4648a0415efc239ffb377bce1d389723eda25d [35/39] tracing/boot: Show correct histogram error command
config: s390-allyesconfig (attached as .config)
compiler: s390-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git/commit/?id=5d4648a0415efc239ffb377bce1d389723eda25d
        git remote add trace https://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
        git fetch --no-tags trace ftrace/core
        git checkout 5d4648a0415efc239ffb377bce1d389723eda25d
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=s390 

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

All warnings (new ones prefixed by >>):

   kernel/trace/trace_boot.c: In function 'trace_boot_init_histograms':
>> kernel/trace/trace_boot.c:418:17: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     418 |                 if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0)
         |                 ^~
   kernel/trace/trace_boot.c:420:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
     420 |                         if (trigger_process_regex(file, buf) < 0)
         |                         ^~


vim +/if +418 kernel/trace/trace_boot.c

30cb856e3067e5 Masami Hiramatsu 2021-08-06  395  
30cb856e3067e5 Masami Hiramatsu 2021-08-06  396  static void __init
30cb856e3067e5 Masami Hiramatsu 2021-08-06  397  trace_boot_init_histograms(struct trace_event_file *file,
30cb856e3067e5 Masami Hiramatsu 2021-08-06  398  			   struct xbc_node *hnode, char *buf, size_t size)
30cb856e3067e5 Masami Hiramatsu 2021-08-06  399  {
30cb856e3067e5 Masami Hiramatsu 2021-08-06  400  	struct xbc_node *node;
30cb856e3067e5 Masami Hiramatsu 2021-08-06  401  	const char *p;
5d4648a0415efc Masami Hiramatsu 2021-08-06  402  	char *tmp;
30cb856e3067e5 Masami Hiramatsu 2021-08-06  403  
30cb856e3067e5 Masami Hiramatsu 2021-08-06  404  	xbc_node_for_each_subkey(hnode, node) {
30cb856e3067e5 Masami Hiramatsu 2021-08-06  405  		p = xbc_node_get_data(node);
30cb856e3067e5 Masami Hiramatsu 2021-08-06  406  		if (!isdigit(p[0]))
30cb856e3067e5 Masami Hiramatsu 2021-08-06  407  			continue;
30cb856e3067e5 Masami Hiramatsu 2021-08-06  408  		/* All digit started node should be instances. */
30cb856e3067e5 Masami Hiramatsu 2021-08-06  409  		if (trace_boot_compose_hist_cmd(node, buf, size) == 0) {
5d4648a0415efc Masami Hiramatsu 2021-08-06  410  			tmp = kstrdup(buf, GFP_KERNEL);
30cb856e3067e5 Masami Hiramatsu 2021-08-06  411  			if (trigger_process_regex(file, buf) < 0)
5d4648a0415efc Masami Hiramatsu 2021-08-06  412  				pr_err("Failed to apply hist trigger: %s\n", tmp);
5d4648a0415efc Masami Hiramatsu 2021-08-06  413  			kfree(tmp);
30cb856e3067e5 Masami Hiramatsu 2021-08-06  414  		}
30cb856e3067e5 Masami Hiramatsu 2021-08-06  415  	}
30cb856e3067e5 Masami Hiramatsu 2021-08-06  416  
30cb856e3067e5 Masami Hiramatsu 2021-08-06  417  	if (xbc_node_find_child(hnode, "keys")) {
30cb856e3067e5 Masami Hiramatsu 2021-08-06 @418  		if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0)
5d4648a0415efc Masami Hiramatsu 2021-08-06  419  			tmp = kstrdup(buf, GFP_KERNEL);
30cb856e3067e5 Masami Hiramatsu 2021-08-06  420  			if (trigger_process_regex(file, buf) < 0)
5d4648a0415efc Masami Hiramatsu 2021-08-06  421  				pr_err("Failed to apply hist trigger: %s\n", tmp);
5d4648a0415efc Masami Hiramatsu 2021-08-06  422  			kfree(tmp);
30cb856e3067e5 Masami Hiramatsu 2021-08-06  423  	}
30cb856e3067e5 Masami Hiramatsu 2021-08-06  424  

:::::: The code at line 418 was first introduced by commit
:::::: 30cb856e3067e5d6ae7b2144e1659145ab7686fd tracing/boot: Support multiple histograms for each event

:::::: TO: Masami Hiramatsu <mhiramat@...nel.org>
:::::: CC: Steven Rostedt (VMware) <rostedt@...dmis.org>

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

Download attachment ".config.gz" of type "application/gzip" (66826 bytes)