From 5ac6da669e2476dbdac89b357b05b5a79bc5b657 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Sat, 10 Feb 2007 01:43:14 -0800 Subject: [PATCH] [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/alpha/Kconfig | 4 ++++ arch/arm/Kconfig | 4 ++++ arch/arm26/Kconfig | 4 ++++ arch/i386/Kconfig | 4 ++++ arch/m32r/Kconfig | 4 ++++ arch/m68k/Kconfig | 4 ++++ arch/mips/Kconfig | 4 ++++ arch/powerpc/Kconfig | 4 ++++ arch/ppc/Kconfig | 4 ++++ arch/sparc/Kconfig | 4 ++++ arch/sparc64/Kconfig | 4 ++++ arch/x86_64/Kconfig | 4 ++++ mm/Kconfig | 4 ---- 13 files changed, 48 insertions(+), 4 deletions(-) diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 84caf50..770f717 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 1523046e..fbf4b2a 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 74eba8b..989113d 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 0dfee81..63d5e84 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 f383dab..565d013 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 70a577c..0bffbe6 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 9d839a9..1bc6d24 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 f08e80a..0088c5e 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 c22e606..0df9c33 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 d0dec1e..bd992c0 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 d41f66a..fb84647 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 d427553..02dd394 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 79360cf..7942b33 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 # -- 2.7.4