linux-kernel - [PATCH 1/2] mm/page_vma_mapped: use PMD

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Message-Id: <20191128010321.21730-1-richardw.yang@linux.intel.com>
Date:   Thu, 28 Nov 2019 09:03:20 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     akpm@...ux-foundation.org
Cc:     kirill.shutemov@...ux.intel.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: [PATCH 1/2] mm/page_vma_mapped: use PMD_SIZE instead of calculating it

At this point, we are sure page is PageTransHuge, which means
hpage_nr_pages is HPAGE_PMD_NR.

This is safe to use PMD_SIZE instead of calculating it.

Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
---
 mm/page_vma_mapped.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index eff4b4520c8d..76e03650a3ab 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -223,7 +223,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
 			if (pvmw->address >= pvmw->vma->vm_end ||
 			    pvmw->address >=
 					__vma_address(pvmw->page, pvmw->vma) +
-					hpage_nr_pages(pvmw->page) * PAGE_SIZE)
+					PMD_SIZE)
 				return not_found(pvmw);
 			/* Did we cross page table boundary? */
 			if (pvmw->address % PMD_SIZE == 0) {
-- 
2.17.1