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Christoph Lameter 5ac6da669e [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>		18 years ago
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amiga	[PATCH] m68k: replace kmalloc+memset with kzalloc	18 years ago
apollo	…
atari	[PATCH] m68k/Atari: 2.6.18 Atari IDE interrupt needs SA_SHIRQ	18 years ago
bvme6000	…
configs	…
fpsp040	…
hp300	…
ifpsp060	…
kernel	[PATCH] Sun3: General updates	18 years ago
lib	…
mac	…
math-emu	…
mm	[PATCH] getting rid of all casts of k[cmz]alloc() calls	18 years ago
mvme16x	…
mvme147	…
q40	…
sun3	…
sun3x	…
tools/amiga	…
Kconfig	[PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMA	18 years ago
Kconfig.debug	…
Makefile	…
defconfig	…