include/linux/list.h:74:19: warning: storing the address of local variable 'realm_queue' in '*&realm_24(D)->rebuild_item.prev'

include/linux/list.h:74:19: warning: storing the address of local variable 'realm_queue' in '*&realm_24(D)->rebuild_item.prev'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   80234b5ab240f52fa45d201e899e207b9265ef91
commit: 74a31df4f1f16807a93e414a322baf6eceddb60d ceph: eliminate the recursion when rebuilding the snap context
date:   4 years ago
config: mips-allyesconfig (https://download.01.org/0day-ci/archive/20260315/202603150451.HnobCkPK-lkp@intel.com/config)
compiler: mips-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260315/202603150451.HnobCkPK-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603150451.HnobCkPK-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/preempt.h:11,
                    from include/linux/spinlock.h:55,
                    from include/linux/mmzone.h:8,
                    from include/linux/gfp.h:6,
                    from include/linux/slab.h:15,
                    from fs/ceph/snap.c:5:
   In function '__list_add',
       inlined from 'list_add_tail' at include/linux/list.h:102:2,
       inlined from 'rebuild_snap_realms' at fs/ceph/snap.c:429:2:
>> include/linux/list.h:74:19: warning: storing the address of local variable 'realm_queue' in '*&realm_24(D)->rebuild_item.prev' [-Wdangling-pointer=]
      74 |         new->prev = prev;
         |         ~~~~~~~~~~^~~~~~
   fs/ceph/snap.c: In function 'rebuild_snap_realms':
   fs/ceph/snap.c:425:19: note: 'realm_queue' declared here
     425 |         LIST_HEAD(realm_queue);
         |                   ^~~~~~~~~~~
   include/linux/list.h:26:26: note: in definition of macro 'LIST_HEAD'
      26 |         struct list_head name = LIST_HEAD_INIT(name)
         |                          ^~~~
   fs/ceph/snap.c:422:57: note: 'realm' declared here
     422 | static void rebuild_snap_realms(struct ceph_snap_realm *realm,
         |                                 ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~


vim +74 include/linux/list.h

d7c816733d501b Kees Cook        2016-08-17  58  
^1da177e4c3f41 Linus Torvalds   2005-04-16  59  /*
^1da177e4c3f41 Linus Torvalds   2005-04-16  60   * Insert a new entry between two known consecutive entries.
^1da177e4c3f41 Linus Torvalds   2005-04-16  61   *
^1da177e4c3f41 Linus Torvalds   2005-04-16  62   * This is only for internal list manipulation where we know
^1da177e4c3f41 Linus Torvalds   2005-04-16  63   * the prev/next entries already!
^1da177e4c3f41 Linus Torvalds   2005-04-16  64   */
^1da177e4c3f41 Linus Torvalds   2005-04-16  65  static inline void __list_add(struct list_head *new,
^1da177e4c3f41 Linus Torvalds   2005-04-16  66  			      struct list_head *prev,
^1da177e4c3f41 Linus Torvalds   2005-04-16  67  			      struct list_head *next)
^1da177e4c3f41 Linus Torvalds   2005-04-16  68  {
d7c816733d501b Kees Cook        2016-08-17  69  	if (!__list_add_valid(new, prev, next))
d7c816733d501b Kees Cook        2016-08-17  70  		return;
d7c816733d501b Kees Cook        2016-08-17  71  
^1da177e4c3f41 Linus Torvalds   2005-04-16  72  	next->prev = new;
^1da177e4c3f41 Linus Torvalds   2005-04-16  73  	new->next = next;
^1da177e4c3f41 Linus Torvalds   2005-04-16 @74  	new->prev = prev;
1c97be677f72b3 Paul E. McKenney 2015-09-20  75  	WRITE_ONCE(prev->next, new);
^1da177e4c3f41 Linus Torvalds   2005-04-16  76  }
^1da177e4c3f41 Linus Torvalds   2005-04-16  77  

:::::: The code at line 74 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>

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