[net-next:master 21/56] fs/seq_file.c:938:9: sparse: struct list_head [noderef] __rcu *

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

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CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: netdev(a)vger.kernel.org
TO: David Howells <dhowells@redhat.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   682a8c633fc32933a73fd0379c62d37d1346055d
commit: ad25f5cb39872ca14bcbe00816ae65c22fe04b89 [21/56] rxrpc: Fix locking issue
:::::: branch date: 3 hours ago
:::::: commit date: 17 hours ago
config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20220523/202205232140.tnBP3KBS-lkp(a)intel.com/config)
compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=ad25f5cb39872ca14bcbe00816ae65c22fe04b89
        git remote add net-next https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
        git fetch --no-tags net-next master
        git checkout ad25f5cb39872ca14bcbe00816ae65c22fe04b89
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.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 +938 fs/seq_file.c

66655de6d132b7 Li Zefan      2010-02-08  933  
ad25f5cb39872c David Howells 2022-05-21  934  struct list_head *seq_list_start_rcu(struct list_head *head, loff_t pos)
ad25f5cb39872c David Howells 2022-05-21  935  {
ad25f5cb39872c David Howells 2022-05-21  936  	struct list_head *lh;
ad25f5cb39872c David Howells 2022-05-21  937  
ad25f5cb39872c David Howells 2022-05-21 @938  	list_for_each_rcu(lh, head)
ad25f5cb39872c David Howells 2022-05-21  939  		if (pos-- == 0)
ad25f5cb39872c David Howells 2022-05-21  940  			return lh;
ad25f5cb39872c David Howells 2022-05-21  941  
ad25f5cb39872c David Howells 2022-05-21  942  	return NULL;
ad25f5cb39872c David Howells 2022-05-21  943  }
ad25f5cb39872c David Howells 2022-05-21  944  EXPORT_SYMBOL(seq_list_start_rcu);
ad25f5cb39872c David Howells 2022-05-21  945  
ad25f5cb39872c David Howells 2022-05-21  946  struct list_head *seq_list_start_head_rcu(struct list_head *head, loff_t pos)
ad25f5cb39872c David Howells 2022-05-21  947  {
ad25f5cb39872c David Howells 2022-05-21  948  	if (!pos)
ad25f5cb39872c David Howells 2022-05-21  949  		return head;
ad25f5cb39872c David Howells 2022-05-21  950  
ad25f5cb39872c David Howells 2022-05-21  951  	return seq_list_start_rcu(head, pos - 1);
ad25f5cb39872c David Howells 2022-05-21  952  }
ad25f5cb39872c David Howells 2022-05-21  953  EXPORT_SYMBOL(seq_list_start_head_rcu);
ad25f5cb39872c David Howells 2022-05-21  954  
ad25f5cb39872c David Howells 2022-05-21  955  struct list_head *seq_list_next_rcu(void *v, struct list_head *head,
ad25f5cb39872c David Howells 2022-05-21  956  				    loff_t *ppos)
ad25f5cb39872c David Howells 2022-05-21  957  {
ad25f5cb39872c David Howells 2022-05-21  958  	struct list_head *lh;
ad25f5cb39872c David Howells 2022-05-21  959  
ad25f5cb39872c David Howells 2022-05-21 @960  	lh = list_next_rcu((struct list_head *)v);
ad25f5cb39872c David Howells 2022-05-21  961  	++*ppos;
ad25f5cb39872c David Howells 2022-05-21  962  	return lh == head ? NULL : lh;
ad25f5cb39872c David Howells 2022-05-21  963  }
ad25f5cb39872c David Howells 2022-05-21  964  EXPORT_SYMBOL(seq_list_next_rcu);
ad25f5cb39872c David Howells 2022-05-21  965  

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