mm/rmap.o: warning: objtool: hugetlb_add_new_anon_rmap+0x34: unreachable instruction

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

:::::: 
:::::: Manual check reason: "loongarch: unreachable instruction"
:::::: 

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: linux-kernel@vger.kernel.org
TO: Peter Zijlstra <peterz@infradead.org>

Hi Peter,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e7c375b181600caf135cfd03eadbc45eb530f2cb
commit: 06e24745985c8dd0da18337503afcf2f2fdbdff1 objtool: Remove annotate_{,un}reachable()
date:   12 months ago
:::::: branch date: 11 hours ago
:::::: commit date: 12 months ago
config: loongarch-randconfig-r071-20251118 (https://download.01.org/0day-ci/archive/20251118/202511181207.1UGuLEWH-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251118/202511181207.1UGuLEWH-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/r/202511181207.1UGuLEWH-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/pgtable.h:6,
                    from include/linux/mm.h:30,
                    from mm/rmap.c:55:
   include/linux/swapops.h: In function 'swp_entry_to_pmd':
   arch/loongarch/include/asm/pgtable.h:303:34: warning: missing braces around initializer [-Wmissing-braces]
     303 | #define __swp_entry_to_pmd(x)   ((pmd_t) { (x).val | _PAGE_HUGE })
         |                                  ^
   include/linux/swapops.h:578:16: note: in expansion of macro '__swp_entry_to_pmd'
     578 |         return __swp_entry_to_pmd(arch_entry);
         |                ^~~~~~~~~~~~~~~~~~
>> mm/rmap.o: warning: objtool: hugetlb_add_new_anon_rmap+0x34: unreachable instruction

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