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Subject[RFC 6/8] i386 without ZONE_DMA
i386: Optional ZONE_DMA

ZONE_DMA depends on GENERIC_ISA_DMA. We allow the user to configure
GENERIC_ISA_DMA. If it is switched off then we buid a kernel without
ZONE_DMA.

Note that this patch is incomplete: All device drivers that use GENERIC_ISA_DMA
need to depend on it. This was not tested for i386 NUMA and other miscalleneous
configuration. But it works on my desktop (dual core Pentium).

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.17-mm6/arch/i386/kernel/setup.c
===================================================================
--- linux-2.6.17-mm6.orig/arch/i386/kernel/setup.c 2006-07-07 09:01:12.000000000 -0700
+++ linux-2.6.17-mm6/arch/i386/kernel/setup.c 2006-07-07 16:21:53.000000000 -0700
@@ -1207,15 +1207,19 @@ void __init zone_sizes_init(void)
max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
low = max_low_pfn;

+#ifdef CONFIG_ZONE_DMA
if (low < max_dma)
zones_size[ZONE_DMA] = low;
else {
zones_size[ZONE_DMA] = max_dma;
zones_size[ZONE_NORMAL] = low - max_dma;
+ }
+#else
+ zones_size[ZONE_NORMAL] = low;
+#endif
#ifdef CONFIG_HIGHMEM
- zones_size[ZONE_HIGHMEM] = highend_pfn - low;
+ zones_size[ZONE_HIGHMEM] = highend_pfn - low;
#endif
- }
free_area_init(zones_size);
}
#else
Index: linux-2.6.17-mm6/arch/i386/Kconfig
===================================================================
--- linux-2.6.17-mm6.orig/arch/i386/Kconfig 2006-07-07 16:15:10.000000000 -0700
+++ linux-2.6.17-mm6/arch/i386/Kconfig 2006-07-07 16:18:57.000000000 -0700
@@ -41,10 +41,6 @@ config MMU
config SBUS
bool

-config GENERIC_ISA_DMA
- bool
- default y
-
config GENERIC_IOMAP
bool
default y
@@ -344,6 +340,15 @@ config VM86
XFree86 to initialize some video cards via BIOS. Disabling this
option saves about 6k.

+config GENERIC_ISA_DMA
+ bool "ISA DMA zone (to support ISA legacy DMA)"
+ default y
+ help
+ If DMA for ISA boards needs to be supported then this option
+ needs to be enabled. An additional DMA zone for <16MB memory
+ will be created and memory below 16MB will be used for those
+ devices.
+
config TOSHIBA
tristate "Toshiba Laptop support"
---help---
Index: linux-2.6.17-mm6/arch/i386/kernel/Makefile
===================================================================
--- linux-2.6.17-mm6.orig/arch/i386/kernel/Makefile 2006-07-07 16:16:19.000000000 -0700
+++ linux-2.6.17-mm6/arch/i386/kernel/Makefile 2006-07-07 16:17:16.000000000 -0700
@@ -7,8 +7,9 @@ extra-y := head.o init_task.o vmlinux.ld
obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o \
ptrace.o time.o ioport.o ldt.o setup.o i8259.o sys_i386.o \
pci-dma.o i386_ksyms.o i387.o bootflag.o \
- quirks.o i8237.o topology.o alternative.o i8253.o tsc.o
+ quirks.o topology.o alternative.o i8253.o tsc.o

+obj-$(CONFIG_GENERIC_ISA_DMA) += i8237.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += cpu/
obj-y += acpi/
-
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