linux/arch/xtensa
Christoph Lameter 66701b1499 [PATCH] optional ZONE_DMA: introduce CONFIG_ZONE_DMA
This patch simply defines CONFIG_ZONE_DMA for all arches.  We later do special
things with CONFIG_ZONE_DMA after the VM and an arch are prepared to work
without ZONE_DMA.

CONFIG_ZONE_DMA can be defined in two ways depending on how an architecture
handles ISA DMA.

First if CONFIG_GENERIC_ISA_DMA is set by the arch then we know that the arch
needs ZONE_DMA because ISA DMA devices are supported.  We can catch this in
mm/Kconfig and do not need to modify arch code.

Second, arches may use ZONE_DMA in an unknown way.  We set CONFIG_ZONE_DMA for
all arches that do not set CONFIG_GENERIC_ISA_DMA in order to insure backwards
compatibility.  The arches may later undefine ZONE_DMA if their arch code has
been verified to not depend on ZONE_DMA.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11 10:51:18 -08:00
..
boot [PATCH] xtensa: remove extra header files 2006-12-10 09:55:39 -08:00
configs [PATCH] xtensa: remove extra header files 2006-12-10 09:55:39 -08:00
kernel [PATCH] Xtensa: Add ktermios and minor filename fix 2006-12-13 09:05:50 -08:00
lib [PATCH] xtensa: remove extra header files 2006-12-10 09:55:39 -08:00
mm [PATCH] xtensa: remove extra header files 2006-12-10 09:55:39 -08:00
platform-iss [PATCH] xtensa: remove extra header files 2006-12-10 09:55:39 -08:00
Kconfig [PATCH] optional ZONE_DMA: introduce CONFIG_ZONE_DMA 2007-02-11 10:51:18 -08:00
Kconfig.debug
Makefile [PATCH] xtensa: remove extra header files 2006-12-10 09:55:39 -08:00