linux-kernel - [PATCH] [2/2] x86_64: Fix CONFIG_IOMMU

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Date:	Tue, 01 Aug 2006 05:44:26 +0200
From:	"Andi Kleen" <ak@...e.de>
To:	torvalds@...l.org
Cc:	linux-kernel@...r.kernel.org, discuss@...-64.org, muli@...ibm.com
Subject: [PATCH] [2/2] x86_64: Fix CONFIG_IOMMU_DEBUG


From: Muli Ben-Yehuda <muli@...ibm.com>

If CONFIG_IOMMU_DEBUG is set force_iommu defaults to 1. In the case
where no HW IOMMU is present in the machine and we end up using nommu,
leaving force_iommu set to 1 causes dma_alloc_coherent to do the wrong
thing. Therefore, if we end up using nommu, make sure force_iommu is
0.

Signed-off-by: Muli Ben-Yehuda <muli@...ibm.com>
Signed-off-by: Andi Kleen <ak@...e.de>

---
 arch/x86_64/kernel/pci-nommu.c |    2 ++
 1 files changed, 2 insertions(+)

Index: linux/arch/x86_64/kernel/pci-nommu.c
===================================================================
--- linux.orig/arch/x86_64/kernel/pci-nommu.c
+++ linux/arch/x86_64/kernel/pci-nommu.c
@@ -92,5 +92,7 @@ void __init no_iommu_init(void)
 {
 	if (dma_ops)
 		return;
+
+	force_iommu = 0; /* no HW IOMMU */
 	dma_ops = &nommu_dma_ops;
 }
-
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