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5ac6da669e
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> |
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.. | ||
arc | ||
au1000 | ||
basler/excite | ||
boot | ||
cobalt | ||
configs | ||
ddb5xxx | ||
dec | ||
emma2rh | ||
gt64120 | ||
jazz | ||
jmr3927 | ||
kernel | ||
lasat | ||
lib | ||
lib-32 | ||
lib-64 | ||
math-emu | ||
mips-boards | ||
mm | ||
momentum | ||
oprofile | ||
pci | ||
philips/pnx8550 | ||
pmc-sierra | ||
qemu | ||
sgi-ip22 | ||
sgi-ip27 | ||
sgi-ip32 | ||
sibyte | ||
sni | ||
tx4927 | ||
tx4938 | ||
vr41xx | ||
defconfig | ||
Kconfig | ||
Kconfig.debug | ||
Makefile |