linux-kernel - arch/s390/include/asm/bitops.h:60:17: error: impossible constraint in 'asm'

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Message-ID: <202502091912.xL2xTCGw-lkp@intel.com>
Date: Sun, 9 Feb 2025 19:20:36 +0800
From: kernel test robot <lkp@...el.com>
To: Heiko Carstens <hca@...ux.ibm.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Alexander Gordeev <agordeev@...ux.ibm.com>
Subject: arch/s390/include/asm/bitops.h:60:17: error: impossible constraint
 in 'asm'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   9946eaf552b194bb352c2945b54ff98c8193b3f1
commit: b2bc1b1a77c0ffc2f51e90b1112d7f5530e4d15c s390/bitops: Provide optimized arch_test_bit()
date:   4 weeks ago
config: s390-randconfig-r052-20250209 (https://download.01.org/0day-ci/archive/20250209/202502091912.xL2xTCGw-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250209/202502091912.xL2xTCGw-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202502091912.xL2xTCGw-lkp@intel.com/

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/bitops.h:68,
                    from include/linux/thread_info.h:27,
                    from arch/s390/include/asm/preempt.h:6,
                    from include/linux/preempt.h:79,
                    from include/linux/alloc_tag.h:11,
                    from include/linux/vmalloc.h:5,
                    from mm/vmalloc.c:11:
   In function 'arch_test_bit',
       inlined from 'node_state' at include/linux/nodemask.h:423:9,
       inlined from 'warn_if_node_offline' at include/linux/gfp.h:252:2,
       inlined from '__alloc_pages_node_noprof' at include/linux/gfp.h:267:2,
       inlined from 'alloc_pages_node_noprof' at include/linux/gfp.h:296:9,
       inlined from 'vm_area_alloc_pages.constprop' at mm/vmalloc.c:3591:11:
>> arch/s390/include/asm/bitops.h:60:17: warning: 'asm' operand 2 probably does not match constraints
      60 |                 asm volatile(
         |                 ^~~
>> arch/s390/include/asm/bitops.h:60:17: error: impossible constraint in 'asm'


vim +/asm +60 arch/s390/include/asm/bitops.h

    48	
    49	static __always_inline bool arch_test_bit(unsigned long nr, const volatile unsigned long *ptr)
    50	{
    51	#ifdef __HAVE_ASM_FLAG_OUTPUTS__
    52		const volatile unsigned char *addr;
    53		unsigned long mask;
    54		int cc;
    55	
    56		if (__builtin_constant_p(nr)) {
    57			addr = (const volatile unsigned char *)ptr;
    58			addr += (nr ^ (BITS_PER_LONG - BITS_PER_BYTE)) / BITS_PER_BYTE;
    59			mask = 1UL << (nr & (BITS_PER_BYTE - 1));
  > 60			asm volatile(
    61				"	tm	%[addr],%[mask]\n"
    62				: "=@cc" (cc)
    63				: [addr] "R" (*addr), [mask] "I" (mask)
    64				);
    65			return cc == 3;
    66		}
    67	#endif
    68		return generic_test_bit(nr, ptr);
    69	}
    70	

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https://github.com/intel/lkp-tests/wiki