Re: [RFC PATCH v2 08/21] riscv: mm: Reimplement page table entry atomic get function

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

Hi Xu,

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

[auto build test ERROR on perf-tools-next/perf-tools-next]
[also build test ERROR on arnd-asm-generic/master]
[cannot apply to akpm-mm/mm-everything tip/perf/core perf-tools/perf-tools s390/features linus/master acme/perf/core v6.13-rc1 next-20241204]
[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/Xu-Lu/riscv-mm-Distinguish-hardware-base-page-and-software-base-page/20241205-184429
base:   https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git perf-tools-next
patch link:    https://lore.kernel.org/r/20241205103729.14798-9-luxu.kernel%40bytedance.com
patch subject: [RFC PATCH v2 08/21] riscv: mm: Reimplement page table entry atomic get function
config: arm-randconfig-002-20241205 (https://download.01.org/0day-ci/archive/20241205/202412052157.OnB29LbN-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241205/202412052157.OnB29LbN-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/202412052157.OnB29LbN-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/mm.h:30,
                    from arch/arm/kernel/asm-offsets.c:12:
>> include/linux/pgtable.h:616:21: error: 'pgdp_get_lockless' declared as function returning an array
     616 | static inline pgd_t pgdp_get_lockless(pgd_t *pgdp)
         |                     ^~~~~~~~~~~~~~~~~
   In file included from ./arch/arm/include/generated/asm/rwonce.h:1,
                    from include/linux/compiler.h:317,
                    from arch/arm/kernel/asm-offsets.c:10:
   include/linux/pgtable.h: In function 'pgdp_get_lockless':
>> include/asm-generic/rwonce.h:48:2: error: returning 'const volatile pmdval_t *' {aka 'const volatile unsigned int *'} from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
      48 | ({                                                                      \
         | ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      49 |         compiletime_assert_rwonce_type(x);                              \
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      50 |         __READ_ONCE(x);                                                 \
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      51 | })
         | ~~
   arch/arm/include/asm/pgtable.h:154:33: note: in expansion of macro 'READ_ONCE'
     154 | #define pgdp_get(pgpd)          READ_ONCE(*pgdp)
         |                                 ^~~~~~~~~
   include/linux/pgtable.h:618:16: note: in expansion of macro 'pgdp_get'
     618 |         return pgdp_get(pgdp);
         |                ^~~~~~~~
   make[3]: *** [scripts/Makefile.build:102: arch/arm/kernel/asm-offsets.s] Error 1 shuffle=4053518211
   make[3]: Target 'prepare' not remade because of errors.
   make[2]: *** [Makefile:1203: prepare0] Error 2 shuffle=4053518211
   make[2]: Target 'prepare' not remade because of errors.
   make[1]: *** [Makefile:224: __sub-make] Error 2 shuffle=4053518211
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [Makefile:224: __sub-make] Error 2 shuffle=4053518211
   make: Target 'prepare' not remade because of errors.


vim +/pgdp_get_lockless +616 include/linux/pgtable.h

   614	
   615	#ifndef pgdp_get_lockless
 > 616	static inline pgd_t pgdp_get_lockless(pgd_t *pgdp)
   617	{
   618		return pgdp_get(pgdp);
   619	}
   620	#endif
   621	

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