From af3bbc12df80e8c279b94c752b6edca29841f4f5 Mon Sep 17 00:00:00 2001
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: Fri, 14 Aug 2020 17:30:33 -0700
Subject: mm: add thp_size

This function returns the number of bytes in a THP.  It is like
page_size(), but compiles to just PAGE_SIZE if CONFIG_TRANSPARENT_HUGEPAGE
is disabled.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: http://lkml.kernel.org/r/20200629151959.15779-5-willy@infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/internal.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'mm/internal.h')

diff --git a/mm/internal.h b/mm/internal.h
index d11a9a8d2135..912bb1a1c10e 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -396,7 +396,7 @@ vma_address(struct page *page, struct vm_area_struct *vma)
 	unsigned long start, end;
 
 	start = __vma_address(page, vma);
-	end = start + PAGE_SIZE * (hpage_nr_pages(page) - 1);
+	end = start + thp_size(page) - PAGE_SIZE;
 
 	/* page should be within @vma mapping range */
 	VM_BUG_ON_VMA(end < vma->vm_start || start >= vma->vm_end, vma);
-- 
cgit