linux-kernel - [PATCH 3/7] iommu/core: use the existing IS

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Date:	Fri,  2 Sep 2011 20:32:32 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	<iommu@...ts.linux-foundation.org>
Cc:	<linux-omap@...r.kernel.org>,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Joerg Roedel <Joerg.Roedel@....com>,
	David Woodhouse <dwmw2@...radead.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	David Brown <davidb@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>, <linux-kernel@...r.kernel.org>,
	Ohad Ben-Cohen <ohad@...ery.com>
Subject: [PATCH 3/7] iommu/core: use the existing IS_ALIGNED macro

Replace iommu's alignment checks with the existing IS_ALIGNED macro,
to drop a few lines of code and utilize IS_ALIGNED's type safety.

Signed-off-by: Ohad Ben-Cohen <ohad@...ery.com>
---
 drivers/iommu/iommu.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 6e6b6a1..e61a9ba 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -16,6 +16,7 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
+#include <linux/kernel.h>
 #include <linux/bug.h>
 #include <linux/types.h>
 #include <linux/module.h>
@@ -97,13 +98,11 @@ EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
 int iommu_map(struct iommu_domain *domain, unsigned long iova,
 	      phys_addr_t paddr, int gfp_order, int prot)
 {
-	unsigned long invalid_mask;
 	size_t size;
 
 	size         = 0x1000UL << gfp_order;
-	invalid_mask = size - 1;
 
-	BUG_ON((iova | paddr) & invalid_mask);
+	BUG_ON(!IS_ALIGNED(iova | paddr, size));
 
 	return iommu_ops->map(domain, iova, paddr, gfp_order, prot);
 }
@@ -111,13 +110,11 @@ EXPORT_SYMBOL_GPL(iommu_map);
 
 int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
 {
-	unsigned long invalid_mask;
 	size_t size;
 
 	size         = 0x1000UL << gfp_order;
-	invalid_mask = size - 1;
 
-	BUG_ON(iova & invalid_mask);
+	BUG_ON(!IS_ALIGNED(iova, size));
 
 	return iommu_ops->unmap(domain, iova, gfp_order);
 }
-- 
1.7.4.1

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