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-rw-r--r--drivers/iommu/intel/cache.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/intel/cache.c b/drivers/iommu/intel/cache.c
index e8418cdd8331..0a3bb38a5289 100644
--- a/drivers/iommu/intel/cache.c
+++ b/drivers/iommu/intel/cache.c
@@ -245,7 +245,7 @@ static unsigned long calculate_psi_aligned_address(unsigned long start,
* shared_bits are all equal in both pfn and end_pfn.
*/
shared_bits = ~(pfn ^ end_pfn) & ~bitmask;
- mask = shared_bits ? __ffs(shared_bits) : BITS_PER_LONG;
+ mask = shared_bits ? __ffs(shared_bits) : MAX_AGAW_PFN_WIDTH;
}
*_pages = aligned_pages;