Introduce CONFIG_ZONE_DMA

CONFIG_ZONE_DMA can be defined in two ways depending on how
an architecture handles ISA DMA.

First when CONFIG_GENERIC_ISA_DMA is set by the arch then we know that
the arch needs ZONE_DMA because ISA DMA devices are supported. The arch
would need to be modified in order to allow switching ZONE_DMA off.

Second, arches may use ZONE_DMA in an unknown way. We set CONFIG_ZONE_DMA
for all arches that do not set CONFIG_GENERIC_ISA_DMA in order to insure
backwards compatibility. The arches may later undefine ZONE_DMA
if their arch code has been modified to not depend on ZONE_DMA.

As a result of this patch CONFIG_ZONE_DMA should be defined for every
arch.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.18-rc5-mm1/mm/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/mm/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/mm/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -139,6 +139,10 @@
 	default "4096" if PARISC && !PA20
 	default "4"
 
+config ZONE_DMA
+	def_bool y
+	depends on GENERIC_ISA_DMA
+
 #
 # support for page migration
 #
Index: linux-2.6.18-rc5-mm1/arch/ia64/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/ia64/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/ia64/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -22,6 +22,10 @@
 	bool
 	default y
 
+config ZONE_DMA
+	bool
+	default y
+
 config MMU
 	bool
 	default y
Index: linux-2.6.18-rc5-mm1/arch/cris/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/cris/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/cris/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -9,6 +9,10 @@
 	bool
 	default y
 
+config ZONE_DMA
+	bool
+	default y
+
 config RWSEM_GENERIC_SPINLOCK
 	bool
 	default y
Index: linux-2.6.18-rc5-mm1/arch/s390/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/s390/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/s390/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -7,6 +7,10 @@
 	bool
 	default y
 
+config ZONE_DMA
+	bool
+	default y
+
 config LOCKDEP_SUPPORT
 	bool
 	default y
Index: linux-2.6.18-rc5-mm1/arch/xtensa/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/xtensa/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/xtensa/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -7,6 +7,10 @@
 	bool
 	default n
 
+config ZONE_DMA
+	bool
+	default y
+
 config XTENSA
 	bool
 	default y
Index: linux-2.6.18-rc5-mm1/arch/h8300/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/h8300/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/h8300/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -17,6 +17,10 @@
 	bool
 	default n
 
+config ZONE_DMA
+	bool
+	default y
+
 config FPU
 	bool
 	default n
Index: linux-2.6.18-rc5-mm1/arch/v850/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/v850/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/v850/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -10,6 +10,9 @@
 config MMU
        	bool
 	default n
+config ZONE_DMA
+	bool
+	default y
 config RWSEM_GENERIC_SPINLOCK
 	bool
 	default y
Index: linux-2.6.18-rc5-mm1/arch/sh/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/sh/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/sh/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -14,6 +14,10 @@
 	  gaming console.  The SuperH port has a home page at
 	  <http://www.linux-sh.org/>.
 
+config ZONE_DMA
+	bool
+	default y
+
 config RWSEM_GENERIC_SPINLOCK
 	bool
 	default y
Index: linux-2.6.18-rc5-mm1/arch/frv/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/frv/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/frv/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -6,6 +6,10 @@
 	bool
 	default y
 
+config ZONE_DMA
+	bool
+	default y
+
 config RWSEM_GENERIC_SPINLOCK
 	bool
 	default y
Index: linux-2.6.18-rc5-mm1/arch/m68knommu/Kconfig
===================================================================
--- linux-2.6.18-rc5-mm1.orig/arch/m68knommu/Kconfig	2006-09-02 20:10:50.000000000 -0700
+++ linux-2.6.18-rc5-mm1/arch/m68knommu/Kconfig	2006-09-02 20:11:45.000000000 -0700
@@ -17,6 +17,10 @@
 	bool
 	default n
 
+config ZONE_DMA
+	bool
+	default y
+
 config RWSEM_GENERIC_SPINLOCK
 	bool
 	default y