tree:   https://github.com/ammarfaizi2/linux-block brauner/linux/fs.xattr.simple.rework.rbtree
head:   22b0856d76843b1ec4c7f0c379059f2d6114cfaf
commit: 22b0856d76843b1ec4c7f0c379059f2d6114cfaf [1/1] xattr: use rbtree for simple_xattrs
config: mips-randconfig-s053-20221107
compiler: mipsel-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
        # https://github.com/ammarfaizi2/linux-block/commit/22b0856d76843b1ec4c7f0c379059f2d6114cfaf
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block brauner/linux/fs.xattr.simple.rework.rbtree
        git checkout 22b0856d76843b1ec4c7f0c379059f2d6114cfaf
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=mips 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/xattr.c:1099:23: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> fs/xattr.c:1099:23: sparse:    struct rb_node [noderef] __rcu *
>> fs/xattr.c:1099:23: sparse:    struct rb_node *
   fs/xattr.c:1103:39: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/xattr.c:1103:39: sparse:    struct rb_node [noderef] __rcu *
   fs/xattr.c:1103:39: sparse:    struct rb_node *
   fs/xattr.c:1105:39: sparse: sparse: incompatible types in comparison expression (different address spaces):
   fs/xattr.c:1105:39: sparse:    struct rb_node [noderef] __rcu *
   fs/xattr.c:1105:39: sparse:    struct rb_node *
   fs/xattr.c: note: in included file (through include/linux/rculist.h, include/linux/dcache.h, include/linux/fs.h):
   include/linux/rcupdate.h:769:9: sparse: sparse: context imbalance in 'simple_xattr_get' - different lock contexts for basic block
   fs/xattr.c: note: in included file (through include/linux/mm_types.h, include/linux/mmzone.h, include/linux/gfp.h, ...):
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *
   include/linux/rbtree.h:74:9: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rbtree.h:74:9: sparse:    struct rb_node [noderef] __rcu *
   include/linux/rbtree.h:74:9: sparse:    struct rb_node *

vim +1099 fs/xattr.c

  1074	
  1075	/**
  1076	 * simple_xattr_get - get an xattr object
  1077	 * @xattrs: the header of the xattr object
  1078	 * @name: the name of the xattr to retrieve
  1079	 * @buffer: the buffer to store the value into
  1080	 * @size: the size of @buffer
  1081	 *
  1082	 * Try to find and retrieve the xattr object associated with @name. If the
  1083	 * object is found and still in the rbtree bump the reference count.
  1084	 *
  1085	 * If @buffer is provided store the value of @xattr in @buffer.
  1086	 *
  1087	 * Return: On success zero and on error a negative error code is returned.
  1088	 */
  1089	int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
  1090			     void *buffer, size_t size)
  1091	{
  1092		struct simple_xattr *xattr = NULL;
  1093		struct rb_node *rbp;
  1094		int ret, seq = 0;
  1095	
  1096		rcu_read_lock();
  1097		do {
  1098			read_seqbegin_or_lock(&xattrs->lock, &seq);
> 1099			rbp = rcu_dereference(xattrs->rb_root.rb_node);
  1100			while (rbp) {
  1101				xattr = rb_entry(rbp, struct simple_xattr, rb_node);
  1102				if (strcmp(xattr->name, name) < 0) {
  1103					rbp = rcu_dereference(rbp->rb_left);
  1104				} else if (strcmp(xattr->name, name) > 0) {
  1105					rbp = rcu_dereference(rbp->rb_right);
  1106				} else {
  1107					if (!likely(refcount_inc_not_zero(&xattr->ref)))
  1108						xattr = NULL;
  1109					break;
  1110				}
  1111				xattr = NULL;
  1112			}
  1113		} while (need_seqretry(&xattrs->lock, seq));
  1114		done_seqretry(&xattrs->lock, seq);
  1115		rcu_read_unlock();
  1116	
  1117		if (!xattr)
  1118			return -ENODATA;
  1119	
  1120		ret = xattr->size;
  1121		if (buffer) {
  1122			if (size < xattr->size)
  1123				ret = -ERANGE;
  1124			else
  1125				memcpy(buffer, xattr->value, xattr->size);
  1126		}
  1127	
  1128		put_simple_xattr_rcu(xattr);
  1129		return ret;
  1130	}
  1131	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp