Re: [PATCH RFC 2/4] asm-generic/io.h: add io{read,write}128 accessors

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

Hi Chenghai,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build errors:

[auto build test ERROR on arnd-asm-generic/master]
[also build test ERROR on arm64/for-next/core soc/for-next linus/master v6.18-rc5 next-20251111]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Chenghai-Huang/UAPI-Introduce-128-bit-types-and-byteswap-operations/20251112-100133
base:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic.git master
patch link:    https://lore.kernel.org/r/20251112015846.1842207-3-huangchenghai2%40huawei.com
patch subject: [PATCH RFC 2/4] asm-generic/io.h: add io{read,write}128 accessors
config: loongarch-allnoconfig (https://download.01.org/0day-ci/archive/20251112/202511121204.SWr5k0Gt-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 996639d6ebb86ff15a8c99b67f1c2e2117636ae7)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251112/202511121204.SWr5k0Gt-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/202511121204.SWr5k0Gt-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/loongarch/kernel/asm-offsets.c:11:
   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:27:
   In file included from include/linux/kernel_stat.h:8:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/loongarch/include/asm/hardirq.h:10:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:12:
   In file included from arch/loongarch/include/asm/io.h:82:
>> include/asm-generic/io.h:948:54: error: passing 'const volatile void *' to parameter of type 'volatile void *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
     948 |         val = __le128_to_cpu((__le128 __force)__raw_read128(addr));
         |                                                             ^~~~
   include/asm-generic/io.h:152:57: note: passing argument to parameter 'addr' here
     152 | static inline u128 __raw_read128(volatile void __iomem *addr)
         |                                                         ^
   1 error generated.
   make[3]: *** [scripts/Makefile.build:182: arch/loongarch/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1282: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +948 include/asm-generic/io.h

   939	
   940	#ifdef CONFIG_ARCH_SUPPORTS_INT128
   941	#ifndef ioread128
   942	#define ioread128 ioread128
   943	static inline u128 ioread128(const volatile void __iomem *addr)
   944	{
   945		u128 val;
   946	
   947		__io_br();
 > 948		val = __le128_to_cpu((__le128 __force)__raw_read128(addr));
   949		__io_ar(val);
   950	
   951		return val;
   952	}
   953	#endif
   954	#endif /* CONFIG_ARCH_SUPPORTS_INT128 */
   955	

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