linux-kernel - [PATCH 18/23] AMD IOMMU: simplify dma_mask_to

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Date:	Wed, 17 Sep 2008 18:52:52 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	linux-kernel@...r.kernel.org
CC:	iommu@...ts.linux-foundation.org,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 18/23] AMD IOMMU: simplify dma_mask_to_pages

The current calculation is very complicated. This patch replaces it with
a much simpler version.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 65aed6e..e38719a 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -472,8 +472,7 @@ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
  ****************************************************************************/
 static unsigned long dma_mask_to_pages(unsigned long mask)
 {
-	return (mask >> PAGE_SHIFT) +
-		(PAGE_ALIGN(mask & ~PAGE_MASK) >> PAGE_SHIFT);
+	return PAGE_ALIGN(mask) >> PAGE_SHIFT;
 }
 
 /*
-- 
1.5.6.4


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