ARM: Allow SoCs to enable scatterlist chaining

Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

kernel os linux

Allow SoCs to enable the scatterlist chaining support, which allows
scatterlist tables to be broken up into smaller allocations.

As support for this feature depends on the implementation details of
the users of the scatterlists, we can't enable this globally without
auditing all the users, which is a very big task. Instead, let SoCs
progressively switch over to using this.

SoC drivers using scatterlists and SoC DMA implementations need
auditing before this option can be enabled for the SoC.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

Russell King 15 years ago 74facffe 1fa7b6a2

2 changed files

expand all

arch

arm

Kconfig

include

asm

scatterlist.h

arch/arm/Kconfig

··· 37 37 Europe. There is an ARM Linux project with a web page at 38 38 <http://www.arm.linux.org.uk/>. 39 39 40 + config ARM_HAS_SG_CHAIN 41 + bool 42 + 40 43 config HAVE_PWM 41 44 bool 42 45

arch/arm/include/asm/scatterlist.h

··· 1 1 #ifndef _ASMARM_SCATTERLIST_H 2 2 #define _ASMARM_SCATTERLIST_H 3 3 4 + #ifdef CONFIG_ARM_HAS_SG_CHAIN 5 + #define ARCH_HAS_SG_CHAIN 6 + #endif 7 + 4 8 #include <asm/memory.h> 5 9 #include <asm/types.h> 6 10 #include <asm-generic/scatterlist.h>