Re: [akpm-mm:mm-unstable 34/207] fs/binfmt_elf.c:1140:17: warning: implicit conversion from 'unsigned long long' to 'unsigned long' changes value from 4294967296 to 0

[Andrew Morton <akpm@linux-foundation.org>]

On Sat, 07 Mar 2026 20:21:02 +0800 kernel test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head:   49cb736d092aaa856283e33b78ec3afb3964d82f
> commit: cd9119a9480d9d93fdf06792f8f9917cc4f9999c [34/207] mm/userfaultfd: fix hugetlb fault mutex hash calculation
> config: powerpc-currituck_defconfig (https://download.01.org/0day-ci/archive/20260307/202603072018.Dl1xONhs-lkp@intel.com/config)
> compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project c32caeec8158d634bb71ab8911a6031248b9fc47)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260307/202603072018.Dl1xONhs-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/202603072018.Dl1xONhs-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>    In file included from fs/binfmt_elf.c:31:
>    include/linux/hugetlb.h:1214:9: error: call to undeclared function 'linear_page_index'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>     1214 |         return linear_page_index(vma, address);
>          |                ^
>    In file included from fs/binfmt_elf.c:32:

Thanks, I expect v2 will fix this.

--- a/include/linux/hugetlb.h~mm-userfaultfd-fix-hugetlb-fault-mutex-hash-calculation-v2
+++ a/include/linux/hugetlb.h
@@ -1208,12 +1208,6 @@ static inline unsigned int huge_page_shi
 	return PAGE_SHIFT;
 }
 
-static inline pgoff_t vma_hugecache_offset(struct hstate *h,
-		struct vm_area_struct *vma, unsigned long address)
-{
-	return linear_page_index(vma, address);
-}
-
 static inline bool hstate_is_gigantic(struct hstate *h)
 {
 	return false;
_