From: Joerg Roedel <joerg.roedel@amd.com>
Date: Wed, 17 Sep 2008 14:45:59 +0000 (+0200)
Subject: AMD IOMMU: remove unnecessary cast to u64 in the init code
X-Git-Tag: firefly_0821_release~16906^2~3^2~19
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=199d0d501202f077fe647a5c14fe046b17abc46b;p=firefly-linux-kernel-4.4.55.git

AMD IOMMU: remove unnecessary cast to u64 in the init code

The ctrl variable is only u32 and readl also returns a 32 bit value. So
the cast to u64 is pointless. Remove it with this patch.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index e60f4cd29eb2..505fc04e8969 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -235,7 +235,7 @@ static void __init iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
 {
 	u32 ctrl;
 
-	ctrl = (u64)readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
+	ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
 	ctrl &= ~(1 << bit);
 	writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
 }