[stable:linux-5.4.y 633/9999] include/linux/list.h:63:20: warning: storing the address of local variable 'ticket' in '*&space_info_37(D)->priority_tickets.prev'

[stable:linux-5.4.y 633/9999] include/linux/list.h:63:20: warning: storing the address of local variable 'ticket' in '*&space_info_37(D)->priority_tickets.prev'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.4.y
head:   32bea3bac5ca484c6f7e302c8c96fc686f62e7b4
commit: 39c5eb1482b2461ea54e0d23c4742987c20480fa [633/9999] btrfs: don't pass system_chunk into can_overcommit
config: parisc-randconfig-r013-20230411 (https://download.01.org/0day-ci/archive/20230412/202304120017.2CRjmyHB-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=39c5eb1482b2461ea54e0d23c4742987c20480fa
        git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
        git fetch --no-tags stable linux-5.4.y
        git checkout 39c5eb1482b2461ea54e0d23c4742987c20480fa
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash fs/btrfs/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304120017.2CRjmyHB-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/mm.h:99,
                    from fs/btrfs/ctree.h:9,
                    from fs/btrfs/space-info.c:4:
   include/asm-generic/pgtable.h: In function 'pte_clear_not_present_full':
   arch/parisc/include/asm/pgtable.h:91:23: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
      91 |                 pte_t old_pte;                                  \
         |                       ^~~~~~~
   arch/parisc/include/asm/pgtable.h:316:34: note: in expansion of macro 'set_pte_at'
     316 | #define pte_clear(mm, addr, xp)  set_pte_at(mm, addr, xp, __pte(0))
         |                                  ^~~~~~~~~~
   include/asm-generic/pgtable.h:201:9: note: in expansion of macro 'pte_clear'
     201 |         pte_clear(mm, address, ptep);
         |         ^~~~~~~~~
   include/asm-generic/pgtable.h: In function '__ptep_modify_prot_commit':
   arch/parisc/include/asm/pgtable.h:91:23: warning: variable 'old_pte' set but not used [-Wunused-but-set-variable]
      91 |                 pte_t old_pte;                                  \
         |                       ^~~~~~~
   include/asm-generic/pgtable.h:629:9: note: in expansion of macro 'set_pte_at'
     629 |         set_pte_at(vma->vm_mm, addr, ptep, pte);
         |         ^~~~~~~~~~
   In file included from fs/btrfs/space-info.c:6:
   fs/btrfs/sysfs.h: At top level:
   fs/btrfs/sysfs.h:16:1: warning: type qualifiers ignored on function return type [-Wignored-qualifiers]
      16 | const char * const btrfs_feature_set_name(enum btrfs_feature_set set);
         | ^~~~~
   In file included from include/linux/rculist.h:10,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from fs/btrfs/misc.h:6,
                    from fs/btrfs/space-info.c:3:
   In function '__list_add',
       inlined from 'list_add_tail' at include/linux/list.h:93:2,
       inlined from '__reserve_metadata_bytes' at fs/btrfs/space-info.c:1079:4:
>> include/linux/list.h:63:20: warning: storing the address of local variable 'ticket' in '*&space_info_37(D)->priority_tickets.prev' [-Wdangling-pointer=]
      63 |         next->prev = new;
         |         ~~~~~~~~~~~^~~~~
   fs/btrfs/space-info.c: In function '__reserve_metadata_bytes':
   fs/btrfs/space-info.c:1028:31: note: 'ticket' declared here
    1028 |         struct reserve_ticket ticket;
         |                               ^~~~~~
   fs/btrfs/space-info.c:1028:31: note: 'space_info' declared here


vim +63 include/linux/list.h

d7c816733d501b Kees Cook        2016-08-17  49  
^1da177e4c3f41 Linus Torvalds   2005-04-16  50  /*
^1da177e4c3f41 Linus Torvalds   2005-04-16  51   * Insert a new entry between two known consecutive entries.
^1da177e4c3f41 Linus Torvalds   2005-04-16  52   *
^1da177e4c3f41 Linus Torvalds   2005-04-16  53   * This is only for internal list manipulation where we know
^1da177e4c3f41 Linus Torvalds   2005-04-16  54   * the prev/next entries already!
^1da177e4c3f41 Linus Torvalds   2005-04-16  55   */
^1da177e4c3f41 Linus Torvalds   2005-04-16  56  static inline void __list_add(struct list_head *new,
^1da177e4c3f41 Linus Torvalds   2005-04-16  57  			      struct list_head *prev,
^1da177e4c3f41 Linus Torvalds   2005-04-16  58  			      struct list_head *next)
^1da177e4c3f41 Linus Torvalds   2005-04-16  59  {
d7c816733d501b Kees Cook        2016-08-17  60  	if (!__list_add_valid(new, prev, next))
d7c816733d501b Kees Cook        2016-08-17  61  		return;
d7c816733d501b Kees Cook        2016-08-17  62  
^1da177e4c3f41 Linus Torvalds   2005-04-16 @63  	next->prev = new;
^1da177e4c3f41 Linus Torvalds   2005-04-16  64  	new->next = next;
^1da177e4c3f41 Linus Torvalds   2005-04-16  65  	new->prev = prev;
1c97be677f72b3 Paul E. McKenney 2015-09-20  66  	WRITE_ONCE(prev->next, new);
^1da177e4c3f41 Linus Torvalds   2005-04-16  67  }
^1da177e4c3f41 Linus Torvalds   2005-04-16  68  

:::::: The code at line 63 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2

:::::: TO: Linus Torvalds <torvalds@ppc970.osdl.org>
:::::: CC: Linus Torvalds <torvalds@ppc970.osdl.org>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests