From: Miaohe Lin <linmiaohe@huawei.com>
Date: Thu, 2 Sep 2021 21:53:45 +0000 (-0700)
Subject: mm: gup: use helper PAGE_ALIGNED in populate_vma_page_range()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=be51eb18b81b2f0a0a562bac0f6fe0f4b05c439e;p=linux.git

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 a10c48ef613c9..1973bfe59b2ed 100644
--- 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);