linux-kernel - Re: include/linux/hugetlb.h:916:20: error: static declaration of 'arch_hugetlb_migration_supported' follows non-static declaration

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Date: Wed, 14 Feb 2024 13:16:29 +0100
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, 
	Palmer Dabbelt <palmer@...osinc.com>
Subject: Re: include/linux/hugetlb.h:916:20: error: static declaration of
 'arch_hugetlb_migration_supported' follows non-static declaration

On Wed, Feb 14, 2024 at 1:09 PM kernel test robot <lkp@...el.com> wrote:
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   7e90b5c295ec1e47c8ad865429f046970c549a66
> commit: ce68c035457bdd025a9961e0ba2157323090c581 riscv: Fix arch_hugetlb_migration_supported() for NAPOT
> date:   7 days ago
> config: riscv-randconfig-r064-20240214 (https://download.01.org/0day-ci/archive/20240214/202402142035.Aq7hibAu-lkp@intel.com/config)
> compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project c08b90c50bcac9f3f563c79491c8dbcbe7c3b574)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240214/202402142035.Aq7hibAu-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@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202402142035.Aq7hibAu-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>    In file included from kernel/fork.c:52:
> >> include/linux/hugetlb.h:916:20: error: static declaration of 'arch_hugetlb_migration_supported' follows non-static declaration
>      916 | static inline bool arch_hugetlb_migration_supported(struct hstate *h)
>          |                    ^
>    arch/riscv/include/asm/hugetlb.h:15:42: note: expanded from macro 'arch_hugetlb_migration_supported'
>       15 | #define arch_hugetlb_migration_supported arch_hugetlb_migration_supported
>          |                                          ^
>    arch/riscv/include/asm/hugetlb.h:14:6: note: previous declaration is here
>       14 | bool arch_hugetlb_migration_supported(struct hstate *h);
>          |      ^
>    1 error generated.
> --
>    In file included from kernel/sysctl.c:45:
> >> include/linux/hugetlb.h:916:20: error: static declaration of 'arch_hugetlb_migration_supported' follows non-static declaration
>      916 | static inline bool arch_hugetlb_migration_supported(struct hstate *h)
>          |                    ^
>    arch/riscv/include/asm/hugetlb.h:15:42: note: expanded from macro 'arch_hugetlb_migration_supported'
>       15 | #define arch_hugetlb_migration_supported arch_hugetlb_migration_supported
>          |                                          ^
>    arch/riscv/include/asm/hugetlb.h:14:6: note: previous declaration is here
>       14 | bool arch_hugetlb_migration_supported(struct hstate *h);
>          |      ^
>    In file included from kernel/sysctl.c:53:
>    In file included from include/linux/nfs_fs.h:31:
>    In file included from include/linux/sunrpc/auth.h:13:
>    In file included from include/linux/sunrpc/sched.h:19:
>    include/linux/sunrpc/xdr.h:782:46: warning: result of comparison of constant 4611686018427387903 with expression of type '__u32' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare]
>      782 |         if (U32_MAX >= SIZE_MAX / sizeof(*p) && len > SIZE_MAX / sizeof(*p))
>          |                                                 ~~~ ^ ~~~~~~~~~~~~~~~~~~~~~
>    1 warning and 1 error generated.
> --
>    In file included from kernel/events/core.c:31:
> >> include/linux/hugetlb.h:916:20: error: static declaration of 'arch_hugetlb_migration_supported' follows non-static declaration
>      916 | static inline bool arch_hugetlb_migration_supported(struct hstate *h)
>          |                    ^
>    arch/riscv/include/asm/hugetlb.h:15:42: note: expanded from macro 'arch_hugetlb_migration_supported'
>       15 | #define arch_hugetlb_migration_supported arch_hugetlb_migration_supported
>          |                                          ^
>    arch/riscv/include/asm/hugetlb.h:14:6: note: previous declaration is here
>       14 | bool arch_hugetlb_migration_supported(struct hstate *h);
>          |      ^
>    In file included from kernel/events/core.c:43:
>    include/linux/mman.h:158:9: warning: division by zero is undefined [-Wdivision-by-zero]
>      158 |                _calc_vm_trans(flags, MAP_SYNC,       VM_SYNC      ) |
>          |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/mman.h:136:21: note: expanded from macro '_calc_vm_trans'
>      136 |    : ((x) & (bit1)) / ((bit1) / (bit2))))
>          |                     ^ ~~~~~~~~~~~~~~~~~
>    1 warning and 1 error generated.
>
>
> vim +/arch_hugetlb_migration_supported +916 include/linux/hugetlb.h
>
> 161df60e9e8965 Naoya Horiguchi   2022-07-14  902
> c177c81e09e517 Naoya Horiguchi   2014-06-04  903  #ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
> e693de186414ae Anshuman Khandual 2019-03-05  904  #ifndef arch_hugetlb_migration_supported
> e693de186414ae Anshuman Khandual 2019-03-05  905  static inline bool arch_hugetlb_migration_supported(struct hstate *h)
> e693de186414ae Anshuman Khandual 2019-03-05  906  {
> 94310cbcaa3c2b Anshuman Khandual 2017-07-06  907        if ((huge_page_shift(h) == PMD_SHIFT) ||
> 9b553bf5eb99dd Anshuman Khandual 2019-03-05  908                (huge_page_shift(h) == PUD_SHIFT) ||
> 94310cbcaa3c2b Anshuman Khandual 2017-07-06  909                        (huge_page_shift(h) == PGDIR_SHIFT))
> 94310cbcaa3c2b Anshuman Khandual 2017-07-06  910                return true;
> 94310cbcaa3c2b Anshuman Khandual 2017-07-06  911        else
> 94310cbcaa3c2b Anshuman Khandual 2017-07-06  912                return false;
> e693de186414ae Anshuman Khandual 2019-03-05  913  }
> e693de186414ae Anshuman Khandual 2019-03-05  914  #endif
> c177c81e09e517 Naoya Horiguchi   2014-06-04  915  #else
> e693de186414ae Anshuman Khandual 2019-03-05 @916  static inline bool arch_hugetlb_migration_supported(struct hstate *h)
> e693de186414ae Anshuman Khandual 2019-03-05  917  {
> d70c17d436b3fb Chen Gang         2016-05-20  918        return false;
> e693de186414ae Anshuman Khandual 2019-03-05  919  }
> c177c81e09e517 Naoya Horiguchi   2014-06-04  920  #endif
> e693de186414ae Anshuman Khandual 2019-03-05  921
>
> :::::: The code at line 916 was first introduced by commit
> :::::: e693de186414ae66f2a316ff9befcd2b7a6d07b6 mm/hugetlb: enable arch specific huge page size support for migration
>
> :::::: TO: Anshuman Khandual <anshuman.khandual@....com>
> :::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

I sent a fix for this a few days ago here:
https://lore.kernel.org/linux-riscv/20240211083640.756583-1-alexghiti@rivosinc.com/T/#u