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-sama7_defconfig (https://download.01.org/0day-ci/archive/20241205/202412051920.JmptvQXG-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 592c0fe55f6d9a811028b5f3507be91458ab2713)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241205/202412051920.JmptvQXG-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/202412051920.JmptvQXG-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:30:
>> include/linux/pgtable.h:616:38: error: function cannot return array type 'pgd_t' (aka 'unsigned int[2]')
     616 | static inline pgd_t pgdp_get_lockless(pgd_t *pgdp)
         |                                      ^
>> include/linux/pgtable.h:618:9: error: incompatible pointer to integer conversion returning 'const volatile pmdval_t *' (aka 'const volatile unsigned int *') from a function with result type 'int' [-Wint-conversion]
     618 |         return pgdp_get(pgdp);
         |                ^~~~~~~~~~~~~~
   arch/arm/include/asm/pgtable.h:154:25: note: expanded from macro 'pgdp_get'
     154 | #define pgdp_get(pgpd)          READ_ONCE(*pgdp)
         |                                 ^~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:47:28: note: expanded from macro 'READ_ONCE'
      47 | #define READ_ONCE(x)                                                    \
         |                                                                         ^
      48 | ({                                                                      \
         | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      49 |         compiletime_assert_rwonce_type(x);                              \
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      50 |         __READ_ONCE(x);                                                 \
         |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      51 | })
         | ~~
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:1120:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:98:11: warning: array index 3 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds]
      98 |                 return (set->sig[3] | set->sig[2] |
         |                         ^        ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
      17 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:1120:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:98:25: warning: array index 2 is past the end of the array (that has type 'unsigned long[2]') [-Warray-bounds]
      98 |                 return (set->sig[3] | set->sig[2] |
         |                                       ^        ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
      17 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:1120:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:114:11: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
     114 |                 return  (set1->sig[3] == set2->sig[3]) &&
         |                          ^         ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
      17 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:1120:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
     114 |                 return  (set1->sig[3] == set2->sig[3]) &&
         |                                          ^         ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
      17 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:1120:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:115:5: warning: array index 2 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
     115 |                         (set1->sig[2] == set2->sig[2]) &&
         |                          ^         ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
      17 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:1120:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:
   In file included from include/linux/sched/signal.h:6:
   include/linux/signal.h:115:21: warning: array index 2 is past the end of the array (that has type 'const unsigned long[2]') [-Warray-bounds]
     115 |                         (set1->sig[2] == set2->sig[2]) &&
         |                                          ^         ~
   arch/arm/include/asm/signal.h:17:2: note: array 'sig' declared here
      17 |         unsigned long sig[_NSIG_WORDS];
         |         ^
   In file included from arch/arm/kernel/asm-offsets.c:12:
   In file included from include/linux/mm.h:1120:
   In file included from include/linux/huge_mm.h:8:
   In file included from include/linux/fs.h:33:
   In file included from include/linux/percpu-rwsem.h:7:
   In file included from include/linux/rcuwait.h:6:


vim +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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