linux-kernel - drivers/remoteproc/remoteproc_debugfs.c:395:31: sparse: sparse: incorrect type in return expression (different base types)

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Date:   Wed, 5 Jan 2022 19:33:25 +0800
From:   kernel test robot <lkp@...el.com>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        0day robot <lkp@...el.com>
Subject: drivers/remoteproc/remoteproc_debugfs.c:395:31: sparse: sparse:
 incorrect type in return expression (different base types)

tree:   https://github.com/0day-ci/linux/commits/UPDATE-20220105-144328/Miaoqian-Lin/remoteproc-Fix-NULL-vs-IS_ERR-checking-in-rproc_create_trace_file/20211227-170725
head:   e2c26738760efa9568ce3fef6180fb4311e28d08
commit: e2c26738760efa9568ce3fef6180fb4311e28d08 remoteproc: Fix NULL vs IS_ERR() checking in rproc_create_trace_file
date:   5 hours ago
config: powerpc-randconfig-s031-20220105 (https://download.01.org/0day-ci/archive/20220105/202201051942.CihtR2Ia-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/0day-ci/linux/commit/e2c26738760efa9568ce3fef6180fb4311e28d08
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review UPDATE-20220105-144328/Miaoqian-Lin/remoteproc-Fix-NULL-vs-IS_ERR-checking-in-rproc_create_trace_file/20211227-170725
        git checkout e2c26738760efa9568ce3fef6180fb4311e28d08
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=powerpc SHELL=/bin/bash drivers/input/touchscreen/ drivers/remoteproc/

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


sparse warnings: (new ones prefixed by >>)
>> drivers/remoteproc/remoteproc_debugfs.c:395:31: sparse: sparse: incorrect type in return expression (different base types) @@     expected struct dentry * @@     got long @@
   drivers/remoteproc/remoteproc_debugfs.c:395:31: sparse:     expected struct dentry *
   drivers/remoteproc/remoteproc_debugfs.c:395:31: sparse:     got long

vim +395 drivers/remoteproc/remoteproc_debugfs.c

   385	
   386	struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
   387					       struct rproc_debug_trace *trace)
   388	{
   389		struct dentry *tfile;
   390	
   391		tfile = debugfs_create_file(name, 0400, rproc->dbg_dir, trace,
   392					    &trace_rproc_ops);
   393		if (IS_ERR(tfile)) {
   394			dev_err(&rproc->dev, "failed to create debugfs trace entry\n");
 > 395			return PTR_ERR(tfile);
   396		}
   397	
   398		return tfile;
   399	}
   400	

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