mm: gup: use helper PAGE_ALIGNED in populate_vma_page_range()

Use helper PAGE_ALIGNED to check if address is aligned to PAGE_SIZE.
Minor readability improvement.

Link: https://lkml.kernel.org/r/20210807093620.21347-6-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/gup.c b/mm/gup.c
index a10c48e..1973bfe 100644 (file)
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1471,8 +1471,8 @@ long populate_vma_page_range(struct vm_area_struct *vma,
        unsigned long nr_pages = (end - start) / PAGE_SIZE;
        int gup_flags;
 
-       VM_BUG_ON(start & ~PAGE_MASK);
-       VM_BUG_ON(end   & ~PAGE_MASK);
+       VM_BUG_ON(!PAGE_ALIGNED(start));
+       VM_BUG_ON(!PAGE_ALIGNED(end));
        VM_BUG_ON_VMA(start < vma->vm_start, vma);
        VM_BUG_ON_VMA(end   > vma->vm_end, vma);
        mmap_assert_locked(mm);