WSL2-Linux-Kernel/arch/i386
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>
2007-02-11 10:51:19 -08:00
..
boot [PATCH] __crc_... is intended to be absolute 2007-02-01 16:17:06 -08:00
crypto [CRYPTO] api: Get rid of flags argument to setkey 2006-09-21 11:41:02 +10:00
kernel [PATCH] i386 vDSO: use install_special_mapping 2007-02-09 09:25:47 -08:00
lib [PATCH] separate bdi congestion functions from queue congestion functions 2006-10-20 10:26:35 -07:00
mach-default [PATCH] mca_nmi_hook() can be called at any point 2007-02-01 16:17:05 -08:00
mach-es7000 ACPICA: Remove duplicate table manager 2007-02-02 21:14:28 -05:00
mach-generic [PATCH] i386: make apic probe function non-init 2007-01-11 01:52:44 +01:00
mach-visws [PATCH] visws: sgivwfb as module needs exports 2006-12-08 08:29:07 -08:00
mach-voyager [PATCH] x86: fix PDA variables to work during boot 2007-01-22 19:39:36 -08:00
math-emu [PATCH] i386: fix must_checks 2006-12-07 02:14:00 +01:00
mm [PATCH] misc NULL noise removal 2007-02-09 09:14:07 -08:00
oprofile [PATCH] oprofile: ppro: need to enable/disable all the counters 2006-09-29 09:18:11 -07:00
pci ACPICA: Remove duplicate table definitions (non-conflicting), cont 2007-02-02 21:14:29 -05:00
power Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6 2006-12-07 08:59:11 -08:00
Kconfig [PATCH] Set CONFIG_ZONE_DMA for arches with GENERIC_ISA_DMA 2007-02-11 10:51:19 -08:00
Kconfig.cpu [PATCH] LOG2: Implement a general integer log2 facility in the kernel 2006-12-08 08:28:51 -08:00
Kconfig.debug [PATCH] paravirt: Patch inline replacements for paravirt intercepts 2006-12-07 02:14:08 +01:00
Makefile [PATCH] i386: always enable regparm 2006-12-07 02:14:12 +01:00
Makefile.cpu [PATCH] i386: Add support for compilation for Core2 2006-12-07 02:14:09 +01:00
defconfig Pull motherboard into test branch 2007-02-03 01:38:16 -05:00