diff options
| author | Christoph Lameter <clameter@sgi.com> | 2007-02-10 01:43:14 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-11 10:51:19 -0800 |
| commit | 5ac6da669e2476dbdac89b357b05b5a79bc5b657 (patch) | |
| tree | 45b16221dd4f246595638e5fb6f629ddda96ff33 /arch | |
| parent | 339ba9b15df58199b9783a23af234e947ec9e6ba (diff) | |
[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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/alpha/Kconfig | 4 | ||||
| -rw-r--r-- | arch/arm/Kconfig | 4 | ||||
| -rw-r--r-- | arch/arm26/Kconfig | 4 | ||||
| -rw-r--r-- | arch/i386/Kconfig | 4 | ||||
| -rw-r--r-- | arch/m32r/Kconfig | 4 | ||||
| -rw-r--r-- | arch/m68k/Kconfig | 4 | ||||
| -rw-r--r-- | arch/mips/Kconfig | 4 | ||||
| -rw-r--r-- | arch/powerpc/Kconfig | 4 | ||||
| -rw-r--r-- | arch/ppc/Kconfig | 4 | ||||
| -rw-r--r-- | arch/sparc/Kconfig | 4 | ||||
| -rw-r--r-- | arch/sparc64/Kconfig | 4 | ||||
| -rw-r--r-- | arch/x86_64/Kconfig | 4 |
12 files changed, 48 insertions, 0 deletions
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 84caf50725b5..770f717bd250 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 1523046e092b..fbf4b2a62b60 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 74eba8b5a8ca..989113dce415 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 0dfee812811a..63d5e841caf5 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 f383dab973f5..565d0138078e 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 70a577c89c7c..0bffbe6e7e11 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 9d839a9c4b1a..1bc6d249be44 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 f08e80a0bf0a..0088c5ebca78 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 c22e60619d9b..0df9c33629fd 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 d0dec1ea2eed..bd992c0048f0 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 d41f66ac7fff..fb84647dbf3d 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 d4275537b25b..02dd39457bcf 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 |