linux-kernel - Re: [PATCH 06/16] dyndbg: fix a BUG_ON in ddebug_describe

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Date:   Tue, 3 Dec 2019 01:37:12 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jim Cromie <jim.cromie@...il.com>
Cc:     kbuild-all@...ts.01.org, jbaron@...mai.com,
        linux-kernel@...r.kernel.org, linux@...musvillemoes.dk,
        greg@...ah.com, Jim Cromie <jim.cromie@...il.com>
Subject: Re: [PATCH 06/16] dyndbg: fix a BUG_ON in ddebug_describe_flags

Hi Jim,

I love your patch! Yet something to improve:

[auto build test ERROR on jeyu/modules-next]
[also build test ERROR on v5.4 next-20191202]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Jim-Cromie/dynamic-debug-cleanups-2-new-features/20191128-023731
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux.git modules-next
config: x86_64-rhel-7.6 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-1) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

Note: the linux-review/Jim-Cromie/dynamic-debug-cleanups-2-new-features/20191128-023731 HEAD 89f783b27d95e352559b645885086a41e514b5eb builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   lib/dynamic_debug.c: In function 'ddebug_change':
>> lib/dynamic_debug.c:151:18: error: 'flags' redeclared as different kind of symbol
     struct flagsbuf flags;
                     ^~~~~
   lib/dynamic_debug.c:145:17: note: previous definition of 'flags' was here
       unsigned int flags, unsigned int mask)
                    ^~~~~
>> lib/dynamic_debug.c:194:34: error: invalid operands to binary | (have 'unsigned int' and 'struct flagsbuf')
       newflags = (dp->flags & mask) | flags;
                  ~~~~~~~~~~~~~~~~~~ ^
>> lib/dynamic_debug.c:199:17: error: invalid operands to binary & (have 'struct flagsbuf' and 'int')
        if (!(flags & _DPRINTK_FLAGS_PRINT))
                    ^
   lib/dynamic_debug.c:201:21: error: invalid operands to binary & (have 'struct flagsbuf' and 'int')
       } else if (flags & _DPRINTK_FLAGS_PRINT)
                        ^

vim +/flags +151 lib/dynamic_debug.c

   137	
   138	/*
   139	 * Search the tables for _ddebug's which match the given `query' and
   140	 * apply the `flags' and `mask' to them.  Returns number of matching
   141	 * callsites, normally the same as number of changes.  If verbose,
   142	 * logs the changes.  Takes ddebug_lock.
   143	 */
   144	static int ddebug_change(const struct ddebug_query *query,
   145				unsigned int flags, unsigned int mask)
   146	{
   147		int i;
   148		struct ddebug_table *dt;
   149		unsigned int newflags;
   150		unsigned int nfound = 0;
 > 151		struct flagsbuf flags;
   152	
   153		/* search for matching ddebugs */
   154		mutex_lock(&ddebug_lock);
   155		list_for_each_entry(dt, &ddebug_tables, link) {
   156	
   157			/* match against the module name */
   158			if (query->module &&
   159			    !match_wildcard(query->module, dt->mod_name))
   160				continue;
   161	
   162			for (i = 0; i < dt->num_ddebugs; i++) {
   163				struct _ddebug *dp = &dt->ddebugs[i];
   164	
   165				/* match against the source filename */
   166				if (query->filename &&
   167				    !match_wildcard(query->filename, dp->filename) &&
   168				    !match_wildcard(query->filename,
   169						   kbasename(dp->filename)) &&
   170				    !match_wildcard(query->filename,
   171						   trim_prefix(dp->filename)))
   172					continue;
   173	
   174				/* match against the function */
   175				if (query->function &&
   176				    !match_wildcard(query->function, dp->function))
   177					continue;
   178	
   179				/* match against the format */
   180				if (query->format &&
   181				    !strstr(dp->format, query->format))
   182					continue;
   183	
   184				/* match against the line number range */
   185				if (query->first_lineno &&
   186				    dp->lineno < query->first_lineno)
   187					continue;
   188				if (query->last_lineno &&
   189				    dp->lineno > query->last_lineno)
   190					continue;
   191	
   192				nfound++;
   193	
 > 194				newflags = (dp->flags & mask) | flags;
   195				if (newflags == dp->flags)
   196					continue;
   197	#ifdef CONFIG_JUMP_LABEL
   198				if (dp->flags & _DPRINTK_FLAGS_PRINT) {
 > 199					if (!(flags & _DPRINTK_FLAGS_PRINT))
   200						static_branch_disable(&dp->key.dd_key_true);
   201				} else if (flags & _DPRINTK_FLAGS_PRINT)
   202					static_branch_enable(&dp->key.dd_key_true);
   203	#endif
   204				dp->flags = newflags;
   205				vpr_info("changed %s:%d [%s]%s =%s\n",
   206					 trim_prefix(dp->filename), dp->lineno,
   207					 dt->mod_name, dp->function,
   208					 ddebug_describe_flags(dp->flags, &flags));
   209			}
   210		}
   211		mutex_unlock(&ddebug_lock);
   212	
   213		if (!nfound && verbose)
   214			pr_info("no matches for query\n");
   215	
   216		return nfound;
   217	}
   218	

---
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