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device-dax: use struct_size()

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Use the struct_size() helper for the size of a struct with variable
array member at the end, rather than manually calculating it.

Link: https://lkml.kernel.org/r/20211202204422.26777-7-joao.m.martins@oracle.com
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joao Martins 2022-01-14 14:04:29 -08:00 committed by Linus Torvalds
parent b9b5777f09
commit 09b8013703
1 changed files with 3 additions and 2 deletions
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5
drivers/dax/device.c
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@ -404,8 +404,9 @@ int dev_dax_probe(struct dev_dax *dev_dax)
return -EINVAL;
if (!pgmap) {
pgmap = devm_kzalloc(dev, sizeof(*pgmap) + sizeof(struct range)
* (dev_dax->nr_range - 1), GFP_KERNEL);
pgmap = devm_kzalloc(dev,
struct_size(pgmap, ranges, dev_dax->nr_range - 1),
GFP_KERNEL);
if (!pgmap)
return -ENOMEM;
pgmap->nr_range = dev_dax->nr_range;