From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> Subject: userfaultfd: use vma_pagesize for all huge page size calculation In __mcopy_atomic_hugetlb() we use two variables to deal with huge page size: vma_hpagesize and huge_page_size. Since they are the same, it is not necessary to use two different mechanism. This patch makes it consistent by all using vma_hpagesize. Link: http://lkml.kernel.org/r/20190927070032.2129-1-richardw.yang@xxxxxxxxxxxxxxx Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/userfaultfd.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) --- a/mm/userfaultfd.c~userfaultfd-use-vma_pagesize-for-all-huge-page-size-calculation +++ a/mm/userfaultfd.c @@ -259,7 +259,7 @@ retry: pte_t dst_pteval; BUG_ON(dst_addr >= dst_start + len); - VM_BUG_ON(dst_addr & ~huge_page_mask(h)); + VM_BUG_ON(dst_addr & (vma_hpagesize - 1)); /* * Serialize via hugetlb_fault_mutex @@ -270,7 +270,7 @@ retry: mutex_lock(&hugetlb_fault_mutex_table[hash]); err = -ENOMEM; - dst_pte = huge_pte_alloc(dst_mm, dst_addr, huge_page_size(h)); + dst_pte = huge_pte_alloc(dst_mm, dst_addr, vma_hpagesize); if (!dst_pte) { mutex_unlock(&hugetlb_fault_mutex_table[hash]); goto out_unlock; @@ -297,7 +297,8 @@ retry: err = copy_huge_page_from_user(page, (const void __user *)src_addr, - pages_per_huge_page(h), true); + vma_hpagesize / PAGE_SIZE, + true); if (unlikely(err)) { err = -EFAULT; goto out; _
