Hi Baoquan,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16 next-20180406]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Baoquan-He/resource-Use-list_head-to-link-sibling-resource/20180408-110108
config: sparc-defconfig (attached as .config)
compiler: sparc-linux-gcc (GCC) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=sparc 

All errors (new ones prefixed by >>):

   arch/sparc/kernel/ioport.c: In function 'sparc_io_proc_show':
>> arch/sparc/kernel/ioport.c:672:9: error: incompatible types when assigning to type 'struct resource *' from type 'struct list_head'
     for (r = root->child; r != NULL; r = r->sibling) {
            ^
   arch/sparc/kernel/ioport.c:672:37: error: incompatible types when assigning to type 'struct resource *' from type 'struct list_head'
     for (r = root->child; r != NULL; r = r->sibling) {
                                        ^

vim +672 arch/sparc/kernel/ioport.c

^1da177e4 Linus Torvalds     2005-04-16  666  
e7a088f93 Alexey Dobriyan    2009-09-01  667  static int sparc_io_proc_show(struct seq_file *m, void *v)
^1da177e4 Linus Torvalds     2005-04-16  668  {
e7a088f93 Alexey Dobriyan    2009-09-01  669  	struct resource *root = m->private, *r;
^1da177e4 Linus Torvalds     2005-04-16  670  	const char *nm;
^1da177e4 Linus Torvalds     2005-04-16  671  
e7a088f93 Alexey Dobriyan    2009-09-01 @672  	for (r = root->child; r != NULL; r = r->sibling) {
c31f76518 Sam Ravnborg       2014-04-21  673  		if ((nm = r->name) == NULL) nm = "???";
e7a088f93 Alexey Dobriyan    2009-09-01  674  		seq_printf(m, "%016llx-%016llx: %s\n",
685143ac1 Greg Kroah-Hartman 2006-06-12  675  				(unsigned long long)r->start,
685143ac1 Greg Kroah-Hartman 2006-06-12  676  				(unsigned long long)r->end, nm);
^1da177e4 Linus Torvalds     2005-04-16  677  	}
^1da177e4 Linus Torvalds     2005-04-16  678  
e7a088f93 Alexey Dobriyan    2009-09-01  679  	return 0;
^1da177e4 Linus Torvalds     2005-04-16  680  }
^1da177e4 Linus Torvalds     2005-04-16  681  

:::::: The code at line 672 was first introduced by commit
:::::: e7a088f935180b90cfe6ab0aaae8a556f46885fe sparc: convert /proc/io_map, /proc/dvma_map to seq_file

:::::: TO: Alexey Dobriyan <adobriyan@gmail.com>
:::::: CC: David S. Miller <davem@davemloft.net>

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