linux-kernel - [dhowells-fs:rxrpc-next 3/7] fs/seq_file.c:960:12: sparse: sparse: incorrect type in assignment (different address spaces)

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Message-ID: <202205212138.PGuJkwT2-lkp@intel.com>
Date:   Sat, 21 May 2022 21:59:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [dhowells-fs:rxrpc-next 3/7] fs/seq_file.c:960:12: sparse: sparse:
 incorrect type in assignment (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git rxrpc-next
head:   ff8a9d0bfd1189450a3048de45bcf4e4a2e95108
commit: 295f57b1849bfb1d838e611367f87479b2fb8959 [3/7] rxrpc: Fix locking issue
config: s390-randconfig-s032-20220519 (https://download.01.org/0day-ci/archive/20220521/202205212138.PGuJkwT2-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?id=295f57b1849bfb1d838e611367f87479b2fb8959
        git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git
        git fetch --no-tags dhowells-fs rxrpc-next
        git checkout 295f57b1849bfb1d838e611367f87479b2fb8959
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

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


sparse warnings: (new ones prefixed by >>)
   fs/seq_file.c:938:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/seq_file.c:938:9: sparse:    struct list_head [noderef] __rcu *
   fs/seq_file.c:938:9: sparse:    struct list_head *
   fs/seq_file.c:938:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/seq_file.c:938:9: sparse:    struct list_head [noderef] __rcu *
   fs/seq_file.c:938:9: sparse:    struct list_head *
>> fs/seq_file.c:960:12: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct list_head *lh @@     got struct list_head [noderef] __rcu * @@
   fs/seq_file.c:960:12: sparse:     expected struct list_head *lh
   fs/seq_file.c:960:12: sparse:     got struct list_head [noderef] __rcu *
   fs/seq_file.c:1087:24: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/seq_file.c:1087:24: sparse:    struct hlist_node [noderef] __rcu *
   fs/seq_file.c:1087:24: sparse:    struct hlist_node *
   fs/seq_file.c:1089:24: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/seq_file.c:1089:24: sparse:    struct hlist_node [noderef] __rcu *
   fs/seq_file.c:1089:24: sparse:    struct hlist_node *

vim +960 fs/seq_file.c

   954	
   955	struct list_head *seq_list_next_rcu(void *v, struct list_head *head,
   956					    loff_t *ppos)
   957	{
   958		struct list_head *lh;
   959	
 > 960		lh = list_next_rcu((struct list_head *)v);
   961		++*ppos;
   962		return lh == head ? NULL : lh;
   963	}
   964	EXPORT_SYMBOL(seq_list_next_rcu);
   965	

-- 
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https://01.org/lkp