Commit 66701b14 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds

[PATCH] optional ZONE_DMA: introduce CONFIG_ZONE_DMA

This patch simply defines CONFIG_ZONE_DMA for all arches.  We later do special
things with CONFIG_ZONE_DMA after the VM and an arch are prepared to work
without ZONE_DMA.

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

First if CONFIG_GENERIC_ISA_DMA is set by the arch then we know that the arch
needs ZONE_DMA because ISA DMA devices are supported.  We can catch this in
mm/Kconfig and do not need to modify arch code.

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 verified to not depend on ZONE_DMA.
Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6267276f
......@@ -9,6 +9,10 @@ config MMU
bool
default y
config ZONE_DMA
bool
default y
config RWSEM_GENERIC_SPINLOCK
bool
default y
......
......@@ -6,6 +6,10 @@ config FRV
bool
default y
config ZONE_DMA
bool
default y
config RWSEM_GENERIC_SPINLOCK
bool
default y
......
......@@ -17,6 +17,10 @@ config SWAP
bool
default n
config ZONE_DMA
bool
default y
config FPU
bool
default n
......
......@@ -24,6 +24,10 @@ config 64BIT
bool
default y
config ZONE_DMA
bool
default y
config MMU
bool
default y
......
......@@ -17,6 +17,10 @@ config FPU
bool
default n
config ZONE_DMA
bool
default y
config RWSEM_GENERIC_SPINLOCK
bool
default y
......
......@@ -7,6 +7,10 @@ config MMU
bool
default y
config ZONE_DMA
bool
default y
config LOCKDEP_SUPPORT
bool
default y
......
......@@ -10,6 +10,9 @@ mainmenu "uClinux/v850 (w/o MMU) Kernel Configuration"
config MMU
bool
default n
config ZONE_DMA
bool
default y
config RWSEM_GENERIC_SPINLOCK
bool
default y
......
......@@ -7,6 +7,10 @@ config FRAME_POINTER
bool
default n
config ZONE_DMA
bool
default y
config XTENSA
bool
default y
......
......@@ -139,6 +139,10 @@ config SPLIT_PTLOCK_CPUS
default "4096" if PARISC && !PA20
default "4"
config ZONE_DMA
def_bool y
depends on GENERIC_ISA_DMA
#
# support for page migration
#
......
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