Re: [PATCH] longsoon/percpu: Simplify _percpu_read() and _percpu_write()

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

Hi Uros,

kernel test robot noticed the following build errors:

[auto build test ERROR on dennis-percpu/for-next]
[also build test ERROR on linus/master v6.11-rc6 next-20240903]
[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/Uros-Bizjak/longsoon-percpu-Simplify-_percpu_read-and-_percpu_write/20240903-182524
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git for-next
patch link:    https://lore.kernel.org/r/20240903102342.36957-1-ubizjak%40gmail.com
patch subject: [PATCH] longsoon/percpu: Simplify _percpu_read() and _percpu_write()
config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20240904/202409040319.2mRdIGd2-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 14.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240904/202409040319.2mRdIGd2-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/202409040319.2mRdIGd2-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/irqflags.h:19,
                    from include/linux/spinlock.h:59,
                    from include/linux/sched.h:2134,
                    from arch/loongarch/kernel/asm-offsets.c:8:
   include/linux/sched/mm.h: In function 'set_active_memcg':
>> arch/loongarch/include/asm/percpu.h:85:33: error: initialization of 'long unsigned int' from 'struct mem_cgroup *' makes integer from pointer without a cast [-Wint-conversion]
      85 | #define __pcpu_cast_8(val)      (val)
         |                                 ^
   arch/loongarch/include/asm/percpu.h:89:35: note: in expansion of macro '__pcpu_cast_8'
      89 |         unsigned long __pcp_val = __pcpu_cast_##size(_val);             \
         |                                   ^~~~~~~~~~~~
   arch/loongarch/include/asm/percpu.h:171:36: note: in expansion of macro '_percpu_write'
     171 | #define this_cpu_write_8(pcp, val) _percpu_write(8, pcp, val)
         |                                    ^~~~~~~~~~~~~
   include/linux/percpu-defs.h:368:25: note: in expansion of macro 'this_cpu_write_8'
     368 |                 case 8: stem##8(variable, __VA_ARGS__);break;           \
         |                         ^~~~
   include/linux/percpu-defs.h:490:41: note: in expansion of macro '__pcpu_size_call'
     490 | #define this_cpu_write(pcp, val)        __pcpu_size_call(this_cpu_write_, pcp, val)
         |                                         ^~~~~~~~~~~~~~~~
   include/linux/sched/mm.h:420:17: note: in expansion of macro 'this_cpu_write'
     420 |                 this_cpu_write(int_active_memcg, memcg);
         |                 ^~~~~~~~~~~~~~
   make[3]: *** [scripts/Makefile.build:116: arch/loongarch/kernel/asm-offsets.s] Error 1
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1199: prepare0] Error 2
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:240: __sub-make] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:240: __sub-make] Error 2
   make: Target 'prepare' not remade because of errors.


vim +85 arch/loongarch/include/asm/percpu.h

    81	
    82	#define __pcpu_cast_1(val)	(((unsigned long) val) & 0xff)
    83	#define __pcpu_cast_2(val)	(((unsigned long) val) & 0xffff)
    84	#define __pcpu_cast_4(val)	(((unsigned long) val) & 0xffffffff)
  > 85	#define __pcpu_cast_8(val)	(val)
    86	

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