[akpm-mm:mm-unstable 206/222] arch/x86/include/asm/pgtable.h:1420:10: error: invalid output size for constraint '+q'

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
head:   7d7894afcca68b40bfca49f4d1303167d224919e
commit: a5c1d6b162e7568305f50186568d6e033ad6d81f [206/222] mm/x86: add missing pud helpers
config: i386-randconfig-002-20240811 (https://download.01.org/0day-ci/archive/20240811/202408111850.Y7rbVXOo-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240811/202408111850.Y7rbVXOo-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/202408111850.Y7rbVXOo-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/asm-offsets.c:14:
   In file included from include/linux/suspend.h:5:
   In file included from include/linux/swap.h:9:
   In file included from include/linux/memcontrol.h:13:
   In file included from include/linux/cgroup.h:17:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:9:
   In file included from include/linux/sched/task.h:13:
   In file included from include/linux/uaccess.h:12:
   In file included from arch/x86/include/asm/uaccess.h:17:
   In file included from arch/x86/include/asm/tlbflush.h:16:
>> arch/x86/include/asm/pgtable.h:1420:10: error: invalid output size for constraint '+q'
    1420 |                 return xchg(pudp, pud);
         |                        ^
   include/linux/atomic/atomic-instrumented.h:4758:2: note: expanded from macro 'xchg'
    4758 |         raw_xchg(__ai_ptr, __VA_ARGS__); \
         |         ^
   include/linux/atomic/atomic-arch-fallback.h:12:18: note: expanded from macro 'raw_xchg'
      12 | #define raw_xchg arch_xchg
         |                  ^
   arch/x86/include/asm/cmpxchg.h:78:27: note: expanded from macro 'arch_xchg'
      78 | #define arch_xchg(ptr, v)       __xchg_op((ptr), (v), xchg, "")
         |                                 ^
   arch/x86/include/asm/cmpxchg.h:48:19: note: expanded from macro '__xchg_op'
      48 |                                       : "+q" (__ret), "+m" (*(ptr))     \
         |                                               ^
   1 error generated.
   make[3]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1 shuffle=3464415616
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1193: prepare0] Error 2 shuffle=3464415616
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:224: __sub-make] Error 2 shuffle=3464415616
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:224: __sub-make] Error 2 shuffle=3464415616
   make: Target 'prepare' not remade because of errors.


vim +1420 arch/x86/include/asm/pgtable.h

  1414	
  1415	static inline pud_t pudp_establish(struct vm_area_struct *vma,
  1416			unsigned long address, pud_t *pudp, pud_t pud)
  1417	{
  1418		page_table_check_pud_set(vma->vm_mm, pudp, pud);
  1419		if (IS_ENABLED(CONFIG_SMP)) {
> 1420			return xchg(pudp, pud);
  1421		} else {
  1422			pud_t old = *pudp;
  1423			WRITE_ONCE(*pudp, pud);
  1424			return old;
  1425		}
  1426	}
  1427	

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