linux-kernel - [PATCH 5/5] mm: gup: use helper PAGE_ALIGNED in populate_vma_page

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Date:   Sat, 7 Aug 2021 17:36:20 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <imbrenda@...ux.ibm.com>, <kirill.shutemov@...ux.intel.com>,
        <jack@...e.cz>, <jhubbard@...dia.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH 5/5] 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.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 mm/gup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/gup.c b/mm/gup.c
index 8c89e614d4aa..802a3deb50cd 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);
-- 
2.23.0