[patch 029/146] device-dax: use ALIGN() for determining pgoff

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From: Joao Martins <joao.m.martins@xxxxxxxxxx>
Subject: device-dax: use ALIGN() for determining pgoff

Rather than calculating @pgoff manually, switch to ALIGN() instead.

Link: https://lkml.kernel.org/r/20211202204422.26777-6-joao.m.martins@xxxxxxxxxx
Suggested-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: Jane Chu <jane.chu@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 drivers/dax/device.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/dax/device.c~device-dax-use-align-for-determining-pgoff
+++ a/drivers/dax/device.c
@@ -234,8 +234,8 @@ static vm_fault_t dev_dax_huge_fault(str
 		 * mapped. No need to consider the zero page, or racing
 		 * conflicting mappings.
 		 */
-		pgoff = linear_page_index(vmf->vma, vmf->address
-				& ~(fault_size - 1));
+		pgoff = linear_page_index(vmf->vma,
+				ALIGN(vmf->address, fault_size));
 		for (i = 0; i < fault_size / PAGE_SIZE; i++) {
 			struct page *page;
 
_



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