tree 6c53d37051e0158aba6a03e1f6a7fc8f1fa299a8
parent 7a16d7c7619b26e5e9bfc1360de0d02a94f7d9eb
author Kirill A. Shutemov <kirill.shutemov@linux.intel.com> 1678879892 +0300
committer Andrew Morton <akpm@linux-foundation.org> 1680748966 -0700

iommu: fix MAX_ORDER usage in __iommu_dma_alloc_pages()

MAX_ORDER is not inclusive: the maximum allocation order buddy allocator
can deliver is MAX_ORDER-1.

Fix MAX_ORDER usage in __iommu_dma_alloc_pages().

Also use GENMASK() instead of hard to read "(2U << order) - 1" magic.

Link: https://lkml.kernel.org/r/20230315113133.11326-10-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>