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x86: turn off iommu merge by default 

revert this commit for now:

    commit 9480626830
    Author: Andi Kleen <ak@suse.de>
    Date:   Fri Oct 19 20:35:03 2007 +0200

        x86: enable iommu_merge by default

it's causing regressions:

    http://bugzilla.kernel.org/show_bug.cgi?id=9412

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2007-11-26 20:42:19 +01:00
parent aafab10d3f
commit bc84cf17b5
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/pci-dma_64.c
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@ -12,7 +12,7 @@
#include <asm/gart.h>
#include <asm/calgary.h>
int iommu_merge __read_mostly = 1;
int iommu_merge __read_mostly = 0;
EXPORT_SYMBOL(iommu_merge);
dma_addr_t bad_dma_address __read_mostly;