[bpf-next:master 209/265] kernel/trace/fprobe.c:201:14: sparse: sparse: incorrect type in assignment (different address spaces)

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
head:   f97b8b9bd630fb76c0e9e11cbf390e3d64a144d7
commit: 5b0ab78998e32564a011b14c4c7f9c81e2d42b9d [209/265] fprobe: Add exit_handler support
config: i386-allmodconfig (https://download.01.org/0day-ci/archive/20220322/202203221549.JQIr40CT-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=5b0ab78998e32564a011b14c4c7f9c81e2d42b9d
        git remote add bpf-next https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git
        git fetch --no-tags bpf-next master
        git checkout 5b0ab78998e32564a011b14c4c7f9c81e2d42b9d
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash kernel/trace/ samples/

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


sparse warnings: (new ones prefixed by >>)
>> kernel/trace/rethook.c:68:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> kernel/trace/rethook.c:68:9: sparse:    void ( [noderef] __rcu * )( ... )
>> kernel/trace/rethook.c:68:9: sparse:    void ( * )( ... )
--
>> kernel/trace/fprobe.c:201:14: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct ftrace_hash *hash @@     got struct ftrace_hash [noderef] __rcu *filter_hash @@
   kernel/trace/fprobe.c:201:14: sparse:     expected struct ftrace_hash *hash
   kernel/trace/fprobe.c:201:14: sparse:     got struct ftrace_hash [noderef] __rcu *filter_hash

vim +201 kernel/trace/fprobe.c

   158	
   159	/**
   160	 * register_fprobe() - Register fprobe to ftrace by pattern.
   161	 * @fp: A fprobe data structure to be registered.
   162	 * @filter: A wildcard pattern of probed symbols.
   163	 * @notfilter: A wildcard pattern of NOT probed symbols.
   164	 *
   165	 * Register @fp to ftrace for enabling the probe on the symbols matched to @filter.
   166	 * If @notfilter is not NULL, the symbols matched the @notfilter are not probed.
   167	 *
   168	 * Return 0 if @fp is registered successfully, -errno if not.
   169	 */
   170	int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter)
   171	{
   172		struct ftrace_hash *hash;
   173		unsigned char *str;
   174		int ret, len;
   175	
   176		if (!fp || !filter)
   177			return -EINVAL;
   178	
   179		fprobe_init(fp);
   180	
   181		len = strlen(filter);
   182		str = kstrdup(filter, GFP_KERNEL);
   183		ret = ftrace_set_filter(&fp->ops, str, len, 0);
   184		kfree(str);
   185		if (ret)
   186			return ret;
   187	
   188		if (notfilter) {
   189			len = strlen(notfilter);
   190			str = kstrdup(notfilter, GFP_KERNEL);
   191			ret = ftrace_set_notrace(&fp->ops, str, len, 0);
   192			kfree(str);
   193			if (ret)
   194				goto out;
   195		}
   196	
   197		/* TODO:
   198		 * correctly calculate the total number of filtered symbols
   199		 * from both filter and notfilter.
   200		 */
 > 201		hash = fp->ops.local_hash.filter_hash;
   202		if (WARN_ON_ONCE(!hash))
   203			goto out;
   204	
   205		ret = fprobe_init_rethook(fp, (int)hash->count);
   206		if (!ret)
   207			ret = register_ftrace_function(&fp->ops);
   208	
   209	out:
   210		if (ret)
   211			fprobe_fail_cleanup(fp);
   212		return ret;
   213	}
   214	EXPORT_SYMBOL_GPL(register_fprobe);
   215	

-- 
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