Hi Peter, Thank you for the patch! Yet something to improve: [auto build test ERROR on arm64/for-next/core] [also build test ERROR on linux/master linus/master v5.12-rc1 next-20210304] [cannot apply to hnaz-linux-mm/master] [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] url: https://github.com/0day-ci/linux/commits/Peter-Xu/hugetlb-Disable-huge-pmd-unshare-for-uffd-wp/20210219-071334 base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: mips-randconfig-m031-20210304 (attached as .config) compiler: mipsel-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/7ede06d6f63e59db4b9dee54f78eeac0c9ca17e4 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Peter-Xu/hugetlb-Disable-huge-pmd-unshare-for-uffd-wp/20210219-071334 git checkout 7ede06d6f63e59db4b9dee54f78eeac0c9ca17e4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): >> mm/hugetlb.c:5376:8: error: conflicting types for 'huge_pmd_share' 5376 | pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct vma, | ^~~~~~~~~~~~~~ In file included from mm/hugetlb.c:39: include/linux/hugetlb.h:155:8: note: previous declaration of 'huge_pmd_share' was here 155 | pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma, | ^~~~~~~~~~~~~~ vim +/huge_pmd_share +5376 mm/hugetlb.c 5343 5344 /* 5345 * unmap huge page backed by shared pte. 5346 * 5347 * Hugetlb pte page is ref counted at the time of mapping. If pte is shared 5348 * indicated by page_count > 1, unmap is achieved by clearing pud and 5349 * decrementing the ref count. If count == 1, the pte page is not shared. 5350 * 5351 * Called with page table lock held and i_mmap_rwsem held in write mode. 5352 * 5353 * returns: 1 successfully unmapped a shared pte page 5354 * 0 the underlying pte page is not shared, or it is the last user 5355 */ 5356 int huge_pmd_unshare(struct mm_struct *mm, struct vm_area_struct *vma, 5357 unsigned long *addr, pte_t *ptep) 5358 { 5359 pgd_t *pgd = pgd_offset(mm, *addr); 5360 p4d_t *p4d = p4d_offset(pgd, *addr); 5361 pud_t *pud = pud_offset(p4d, *addr); 5362 5363 i_mmap_assert_write_locked(vma->vm_file->f_mapping); 5364 BUG_ON(page_count(virt_to_page(ptep)) == 0); 5365 if (page_count(virt_to_page(ptep)) == 1) 5366 return 0; 5367 5368 pud_clear(pud); 5369 put_page(virt_to_page(ptep)); 5370 mm_dec_nr_pmds(mm); 5371 *addr = ALIGN(*addr, HPAGE_SIZE * PTRS_PER_PTE) - HPAGE_SIZE; 5372 return 1; 5373 } 5374 #define want_pmd_share() (1) 5375 #else /* !CONFIG_ARCH_WANT_HUGE_PMD_SHARE */ > 5376 pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct vma, 5377 unsigned long addr, pud_t *pud) 5378 { 5379 return NULL; 5380 } 5381 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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