From 3bca103a1e658d23737d20e1989139d9ca8973bf Mon Sep 17 00:00:00 2001
From: Nicolas Pitre <nico@cam.org>
Date: Tue, 7 Oct 2008 20:14:55 +0100
Subject: [PATCH] [ARM] 5295/1: make ZONE_DMA optional
Most ARM machines don't need a special "DMA" memory zone, and
when configured out, the kernel becomes a bit smaller:
| text data bss dec hex filename
|3826182 102384 111700 4040266 3da64a vmlinux
|3823593 101616 111700 4036909 3d992d vmlinux.nodmazone
This is because the system now has only one zone total which effect is
to optimize away many conditionals in page allocation paths.
So let's configure this zone only on machines that need split zones.
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/Kconfig | 4 +++-
arch/arm/common/Kconfig | 3 ++-
arch/arm/include/asm/memory.h | 2 ++
arch/arm/mach-pxa/Kconfig | 1 +
4 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f5bf38b5f38db..ea52fae33290a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -148,7 +148,6 @@ config ARCH_MAY_HAVE_PC_FDC
config ZONE_DMA
bool
- default y
config GENERIC_ISA_DMA
bool
@@ -357,6 +356,7 @@ config ARCH_IXP4XX
select GENERIC_GPIO
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
+ select ZONE_DMA if PCI
help
Support for Intel's IXP4XX (XScale) family of processors.
@@ -503,6 +503,7 @@ config ARCH_SHARK
bool "Shark"
select ISA
select ISA_DMA
+ select ZONE_DMA
select PCI
help
Support for the StrongARM based Digital DNARD machine, also known
@@ -524,6 +525,7 @@ config ARCH_DAVINCI
select GENERIC_CLOCKEVENTS
select GENERIC_GPIO
select HAVE_CLK
+ select ZONE_DMA
help
Support for TI's DaVinci platform.
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index 3e073467caca6..2e32acca02fbb 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -12,7 +12,8 @@ config ICST307
config SA1111
bool
- select DMABOUNCE
+ select DMABOUNCE if !ARCH_PXA
+ select ZONE_DMA if !ARCH_PXA
config DMABOUNCE
bool
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 7834adbe17746..809ff9ab853a5 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -137,6 +137,8 @@
#ifndef arch_adjust_zones
#define arch_adjust_zones(node,size,holes) do { } while (0)
+#elif !defined(CONFIG_ZONE_DMA)
+#error "custom arch_adjust_zones() requires CONFIG_ZONE_DMA"
#endif
/*
diff --git a/arch/arm/mach-pxa/Kconfig b/arch/arm/mach-pxa/Kconfig
index e8ee7ec9ff6dd..e484f609feda8 100644
--- a/arch/arm/mach-pxa/Kconfig
+++ b/arch/arm/mach-pxa/Kconfig
@@ -210,6 +210,7 @@ config MACH_ARMCORE
bool "CompuLab CM-X270 modules"
select PXA27x
select IWMMXT
+ select ZONE_DMA if PCI
config MACH_MAGICIAN
bool "Enable HTC Magician Support"
--
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