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authorChristoph Lameter <clameter@sgi.com>2007-02-10 01:43:14 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:19 -0800
commit5ac6da669e2476dbdac89b357b05b5a79bc5b657 (patch)
tree45b16221dd4f246595638e5fb6f629ddda96ff33
parent339ba9b15df58199b9783a23af234e947ec9e6ba (diff)
downloadlinux-2.6.34-ux500-5ac6da669e2476dbdac89b357b05b5a79bc5b657.tar.gz
[PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMA
As Andi pointed out: CONFIG_GENERIC_ISA_DMA only disables the ISA DMA channel management. Other functionality may still expect GFP_DMA to provide memory below 16M. So we need to make sure that CONFIG_ZONE_DMA is set independent of CONFIG_GENERIC_ISA_DMA. Undo the modifications to mm/Kconfig where we made ZONE_DMA dependent on GENERIC_ISA_DMA and set theses explicitly in each arches Kconfig. Reviews must occur for each arch in order to determine if ZONE_DMA can be switched off. It can only be switched off if we know that all devices supported by a platform are capable of performing DMA transfers to all of memory (Some arches already support this: uml, avr32, sh sh64, parisc and IA64/Altix). In order to switch ZONE_DMA off conditionally, one would have to establish a scheme by which one can assure that no drivers are enabled that are only capable of doing I/O to a part of memory, or one needs to provide an alternate means of performing an allocation from a specific range of memory (like provided by alloc_pages_range()) and insure that all drivers use that call. In that case the arches alloc_dma_coherent() may need to be modified to call alloc_pages_range() instead of relying on GFP_DMA. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/alpha/Kconfig4
-rw-r--r--arch/arm/Kconfig4
-rw-r--r--arch/arm26/Kconfig4
-rw-r--r--arch/i386/Kconfig4
-rw-r--r--arch/m32r/Kconfig4
-rw-r--r--arch/m68k/Kconfig4
-rw-r--r--arch/mips/Kconfig4
-rw-r--r--arch/powerpc/Kconfig4
-rw-r--r--arch/ppc/Kconfig4
-rw-r--r--arch/sparc/Kconfig4
-rw-r--r--arch/sparc64/Kconfig4
-rw-r--r--arch/x86_64/Kconfig4
-rw-r--r--mm/Kconfig4
13 files changed, 48 insertions, 4 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 84caf50725b..770f717bd25 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -41,6 +41,10 @@ config GENERIC_CALIBRATE_DELAY
bool
default y
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_ISA_DMA
bool
default y
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1523046e092..fbf4b2a62b6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -100,6 +100,10 @@ config GENERIC_BUST_SPINLOCK
config ARCH_MAY_HAVE_PC_FDC
bool
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_ISA_DMA
bool
diff --git a/arch/arm26/Kconfig b/arch/arm26/Kconfig
index 74eba8b5a8c..989113dce41 100644
--- a/arch/arm26/Kconfig
+++ b/arch/arm26/Kconfig
@@ -60,6 +60,10 @@ config GENERIC_CALIBRATE_DELAY
config GENERIC_BUST_SPINLOCK
bool
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_ISA_DMA
bool
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 0dfee812811..63d5e841caf 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -38,6 +38,10 @@ config MMU
bool
default y
+config ZONE_DMA
+ bool
+ default y
+
config SBUS
bool
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index f383dab973f..565d0138078 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -16,6 +16,10 @@ config GENERIC_ISA_DMA
bool
default y
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_HARDIRQS
bool
default y
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 70a577c89c7..0bffbe6e7e1 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -439,6 +439,10 @@ config GENERIC_ISA_DMA
depends on Q40 || AMIGA_PCMCIA || GG2
default y
+config ZONE_DMA
+ bool
+ default y
+
source "drivers/pci/Kconfig"
source "drivers/zorro/Kconfig"
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 9d839a9c4b1..1bc6d249be4 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -8,6 +8,10 @@ mainmenu "Linux/MIPS Kernel Configuration"
menu "Machine selection"
+config ZONE_DMA
+ bool
+ default y
+
choice
prompt "System type"
default SGI_IP22
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index f08e80a0bf0..0088c5ebca7 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -977,6 +977,10 @@ config ISA
have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
you have an embedded board, consult your board documentation.
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_ISA_DMA
bool
depends on PPC64 || POWER4 || 6xx && !CPM2
diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
index c22e60619d9..0df9c33629f 100644
--- a/arch/ppc/Kconfig
+++ b/arch/ppc/Kconfig
@@ -1177,6 +1177,10 @@ config ISA
have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
you have an embedded board, consult your board documentation.
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_ISA_DMA
bool
depends on 6xx && !CPM2
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index d0dec1ea2ee..bd992c0048f 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -13,6 +13,10 @@ config HIGHMEM
bool
default y
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_ISA_DMA
bool
default y
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index d41f66ac7ff..fb84647dbf3 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -232,6 +232,10 @@ config LARGE_ALLOCS
source "mm/Kconfig"
+config ZONE_DMA
+ bool
+ default y
+
config GENERIC_ISA_DMA
bool
default y
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index d4275537b25..02dd39457bc 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -44,6 +44,10 @@ config MMU
bool
default y
+config ZONE_DMA
+ bool
+ default y
+
config ISA
bool
diff --git a/mm/Kconfig b/mm/Kconfig
index 79360cf519b..7942b333e46 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -139,10 +139,6 @@ 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
#