Re: [PATCH V7 2/4] asm-generic/io.h: Add big-endian MMIO accessors

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

Hi Manikanta,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on linus/master arnd-asm-generic/master v6.17-rc7 next-20250924]
[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/Manikanta-Guntupalli/dt-bindings-i3c-Add-AMD-I3C-master-controller-support/20250923-234944
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20250923154551.2112388-3-manikanta.guntupalli%40amd.com
patch subject: [PATCH V7 2/4] asm-generic/io.h: Add big-endian MMIO accessors
config: sparc-allnoconfig (https://download.01.org/0day-ci/archive/20250925/202509250413.sOTeU37m-lkp@intel.com/config)
compiler: sparc-linux-gcc (GCC) 15.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250925/202509250413.sOTeU37m-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/202509250413.sOTeU37m-lkp@intel.com/

All warnings (new ones prefixed by >>):

   In file included from include/linux/io.h:12,
                    from include/linux/irq.h:20,
                    from include/asm-generic/hardirq.h:17,
                    from arch/sparc/include/asm/hardirq_32.h:11,
                    from arch/sparc/include/asm/hardirq.h:7,
                    from include/linux/hardirq.h:11,
                    from include/linux/interrupt.h:11,
                    from include/linux/trace_recursion.h:5,
                    from include/linux/ftrace.h:10,
                    from include/linux/perf_event.h:43,
                    from arch/sparc/mm/fault_32.c:22:
>> arch/sparc/include/asm/io.h:16:9: warning: 'readw_be' redefined
      16 | #define readw_be(__addr)        __raw_readw(__addr)
         |         ^~~~~~~~
   In file included from arch/sparc/include/asm/io_32.h:21,
                    from arch/sparc/include/asm/io.h:7:
   include/asm-generic/io.h:304:9: note: this is the location of the previous definition
     304 | #define readw_be readw_be
         |         ^~~~~~~~
>> arch/sparc/include/asm/io.h:17:9: warning: 'readl_be' redefined
      17 | #define readl_be(__addr)        __raw_readl(__addr)
         |         ^~~~~~~~
   include/asm-generic/io.h:319:9: note: this is the location of the previous definition
     319 | #define readl_be readl_be
         |         ^~~~~~~~
>> arch/sparc/include/asm/io.h:19:9: warning: 'writel_be' redefined
      19 | #define writel_be(__w, __addr)  __raw_writel(__w, __addr)
         |         ^~~~~~~~~
   include/asm-generic/io.h:363:9: note: this is the location of the previous definition
     363 | #define writel_be writel_be
         |         ^~~~~~~~~
>> arch/sparc/include/asm/io.h:20:9: warning: 'writew_be' redefined
      20 | #define writew_be(__l, __addr)  __raw_writew(__l, __addr)
         |         ^~~~~~~~~
   include/asm-generic/io.h:351:9: note: this is the location of the previous definition
     351 | #define writew_be writew_be
         |         ^~~~~~~~~
--
   In file included from include/linux/io.h:12,
                    from include/linux/irq.h:20,
                    from include/asm-generic/hardirq.h:17,
                    from arch/sparc/include/asm/hardirq_32.h:11,
                    from arch/sparc/include/asm/hardirq.h:7,
                    from include/linux/hardirq.h:11,
                    from include/linux/highmem.h:12,
                    from include/linux/pagemap.h:11,
                    from arch/sparc/mm/srmmu.c:15:
>> arch/sparc/include/asm/io.h:16:9: warning: 'readw_be' redefined
      16 | #define readw_be(__addr)        __raw_readw(__addr)
         |         ^~~~~~~~
   In file included from arch/sparc/include/asm/io_32.h:21,
                    from arch/sparc/include/asm/io.h:7:
   include/asm-generic/io.h:304:9: note: this is the location of the previous definition
     304 | #define readw_be readw_be
         |         ^~~~~~~~
>> arch/sparc/include/asm/io.h:17:9: warning: 'readl_be' redefined
      17 | #define readl_be(__addr)        __raw_readl(__addr)
         |         ^~~~~~~~
   include/asm-generic/io.h:319:9: note: this is the location of the previous definition
     319 | #define readl_be readl_be
         |         ^~~~~~~~
>> arch/sparc/include/asm/io.h:19:9: warning: 'writel_be' redefined
      19 | #define writel_be(__w, __addr)  __raw_writel(__w, __addr)
         |         ^~~~~~~~~
   include/asm-generic/io.h:363:9: note: this is the location of the previous definition
     363 | #define writel_be writel_be
         |         ^~~~~~~~~
>> arch/sparc/include/asm/io.h:20:9: warning: 'writew_be' redefined
      20 | #define writew_be(__l, __addr)  __raw_writew(__l, __addr)
         |         ^~~~~~~~~
   include/asm-generic/io.h:351:9: note: this is the location of the previous definition
     351 | #define writew_be writew_be
         |         ^~~~~~~~~
   arch/sparc/mm/srmmu.c: In function 'poke_hypersparc':
   arch/sparc/mm/srmmu.c:1074:32: warning: variable 'clear' set but not used [-Wunused-but-set-variable]
    1074 |         volatile unsigned long clear;
         |                                ^~~~~


vim +/readw_be +16 arch/sparc/include/asm/io.h

21dccddf45aae2 Jan Andersson 2011-05-10   9  
21dccddf45aae2 Jan Andersson 2011-05-10  10  /*
21dccddf45aae2 Jan Andersson 2011-05-10  11   * Defines used for both SPARC32 and SPARC64
21dccddf45aae2 Jan Andersson 2011-05-10  12   */
21dccddf45aae2 Jan Andersson 2011-05-10  13  
21dccddf45aae2 Jan Andersson 2011-05-10  14  /* Big endian versions of memory read/write routines */
21dccddf45aae2 Jan Andersson 2011-05-10  15  #define readb_be(__addr)	__raw_readb(__addr)
21dccddf45aae2 Jan Andersson 2011-05-10 @16  #define readw_be(__addr)	__raw_readw(__addr)
21dccddf45aae2 Jan Andersson 2011-05-10 @17  #define readl_be(__addr)	__raw_readl(__addr)
21dccddf45aae2 Jan Andersson 2011-05-10  18  #define writeb_be(__b, __addr)	__raw_writeb(__b, __addr)
21dccddf45aae2 Jan Andersson 2011-05-10 @19  #define writel_be(__w, __addr)	__raw_writel(__w, __addr)
21dccddf45aae2 Jan Andersson 2011-05-10 @20  #define writew_be(__l, __addr)	__raw_writew(__l, __addr)
21dccddf45aae2 Jan Andersson 2011-05-10  21  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki