diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-05-15 14:02:43 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-05-17 14:52:11 +0400 |
| commit | 47ab0dee661dbd5aca67abe44a333e471134fbf9 (patch) | |
| tree | 6464acf6eb3cd42102fa70e160335626354edfc1 /arch/arm/include/asm/system.h | |
| parent | 8c0b742ca7a7d21de0ddc87eda6ef0b282e4de18 (diff) | |
| download | linux-47ab0dee661dbd5aca67abe44a333e471134fbf9.tar.xz | |
ARM: Optionally allow ARMv6 to use 'normal, bufferable' memory for DMA
Provide a configuration option to allow the ARMv6 to use normal
bufferable memory for coherent DMA. This option is forced to 'y'
for ARMv7, and offered as a configuration option on ARMv6.
Enabling this option requires drivers to have the necessary barriers
to ensure that data in DMA coherent memory is visible prior to the
DMA operation commencing.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/system.h')
| -rw-r--r-- | arch/arm/include/asm/system.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index ca88e6a84707..02f5d99adbc0 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -137,7 +137,7 @@ extern unsigned int user_debug; #define dmb() __asm__ __volatile__ ("" : : : "memory") #endif -#if __LINUX_ARM_ARCH__ >= 7 || defined(CONFIG_SMP) +#if defined(CONFIG_ARM_DMA_MEM_BUFFERABLE) || defined(CONFIG_SMP) #define mb() dmb() #define rmb() dmb() #define wmb() dmb() |