[PATCH] iommu: prompt for IOMMU_IO_PGTABLE_LPAE on ARM archs only

[Chris Clayton]

When running "make oldconfig" for an x86_64 kernel, I was prompted for a setting for IOMMU_IO_PGTABLE_LPAE. From the
prompt and the help text it appears that this config item is relevant to ARMv7/v8 only. This patch prevents the prompt
on non-ARM architectures. Compile tested building a cross-compiled x86_64 kernel in an x86 user space. The resultant
kernel boots fine and I am running it now.

Fixes: e1d3c0fd701df831169b116cd5c5d6203ac07f70
Cc: will.deacon@xxxxxxx
Signed-off-by: Chris Clayton <chris2553@xxxxxxxxxxxxxx>

--- linux/drivers/iommu/Kconfig.orig    2015-02-15 09:44:01.235927248 +0000
+++ linux/drivers/iommu/Kconfig 2015-02-15 09:44:41.131926434 +0000
@@ -22,6 +22,7 @@ config IOMMU_IO_PGTABLE

 config IOMMU_IO_PGTABLE_LPAE
        bool "ARMv7/v8 Long Descriptor Format"
+       depends on ARM || ARM64
        select IOMMU_IO_PGTABLE
        help
          Enable support for the ARM long descriptor pagetable format.
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