On ppc, SWIOTLB is just an alias for DMA bounce buffers

(see Kconfig help:
"Support for IO bounce buffering for systems without an IOMMU..." )
The systems we support all have proper IOMMUs and thus don't need
it.

Author: Torsten Duwe

config/ppc/default

@@ -445,8 +445,8 @@ CONFIG_BINFMT_SCRIPT=y
 # CONFIG_HAVE_AOUT is not set
 CONFIG_BINFMT_MISC=m
 CONFIG_COREDUMP=y
-CONFIG_IOMMU_HELPER=y
-CONFIG_SWIOTLB=y
+# CONFIG_IOMMU_HELPER is not set
+# CONFIG_SWIOTLB is not set
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
 CONFIG_ARCH_HAS_WALK_MEMORY=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE=y

config/ppc/vanilla

@@ -444,7 +444,7 @@ CONFIG_BINFMT_SCRIPT=y
 # CONFIG_HAVE_AOUT is not set
 CONFIG_BINFMT_MISC=m
 CONFIG_COREDUMP=y
-# CONFIG_IOMMU_HELPER is not set
+CONFIG_IOMMU_HELPER=y
 # CONFIG_SWIOTLB is not set
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
 CONFIG_ARCH_HAS_WALK_MEMORY=y

config/ppc64/debug

@@ -528,7 +528,7 @@ CONFIG_COREDUMP=y
 CONFIG_HUGETLB_PAGE_SIZE_VARIABLE=y
 CONFIG_PPC_TRANSACTIONAL_MEM=y
 CONFIG_IOMMU_HELPER=y
-CONFIG_SWIOTLB=y
+# CONFIG_SWIOTLB is not set
 CONFIG_HOTPLUG_CPU=y
 CONFIG_ARCH_CPU_PROBE_RELEASE=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y

config/ppc64/default

@@ -533,7 +533,7 @@ CONFIG_COREDUMP=y
 CONFIG_HUGETLB_PAGE_SIZE_VARIABLE=y
 CONFIG_PPC_TRANSACTIONAL_MEM=y
 CONFIG_IOMMU_HELPER=y
-CONFIG_SWIOTLB=y
+# CONFIG_SWIOTLB is not set
 CONFIG_HOTPLUG_CPU=y
 CONFIG_ARCH_CPU_PROBE_RELEASE=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y

config/ppc64le/debug

@@ -473,7 +473,7 @@ CONFIG_COREDUMP=y
 CONFIG_HUGETLB_PAGE_SIZE_VARIABLE=y
 CONFIG_PPC_TRANSACTIONAL_MEM=y
 CONFIG_IOMMU_HELPER=y
-CONFIG_SWIOTLB=y
+# CONFIG_SWIOTLB is not set
 CONFIG_HOTPLUG_CPU=y
 CONFIG_ARCH_CPU_PROBE_RELEASE=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y

config/ppc64le/default

@@ -478,7 +478,7 @@ CONFIG_COREDUMP=y
 CONFIG_HUGETLB_PAGE_SIZE_VARIABLE=y
 CONFIG_PPC_TRANSACTIONAL_MEM=y
 CONFIG_IOMMU_HELPER=y
-CONFIG_SWIOTLB=y
+# CONFIG_SWIOTLB is not set
 CONFIG_HOTPLUG_CPU=y
 CONFIG_ARCH_CPU_PROBE_RELEASE=y
 CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y