Commit 3bca103a authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Russell King
Browse files

[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: default avatarNicolas Pitre <nico@marvell.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 000b5025

arch/arm/Kconfig

+3 −1
Original line number Diff line number Diff line
@@ -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.

arch/arm/common/Kconfig

+2 −1
Original line number Diff line number Diff line
@@ -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

arch/arm/include/asm/memory.h

+2 −0
Original line number Diff line number Diff line
@@ -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



/*

arch/arm/mach-pxa/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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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