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Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f6179f41566d..5dec03f1e5ae 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1371,6 +1371,25 @@ config UACCESS_WITH_MEMCPY However, if the CPU data cache is using a write-allocate mode, this option is unlikely to provide any performance gain. +config UNOFFICIAL_USER_DMA_API + bool "Enable unofficial user DMA API (READ HELP TEXT)" + depends on EXPERIMENTAL + help + This option enables the exposure of the kernel's three DMA cache + coherence functions to userspace via three ARM private syscalls. + + This API is not officially supported; it is a stop gap measure + to allow developers to achieve their goals. It doesn't take + account of any DMA restrictions which may be in the system, and + makes no attempt to work around those. + + The user is entirely responsible for coordinating the use of this + API with DMA activity and CPU snooping activity. Improper use + of this API can result in random data corruption, especially if + the memory contains DMA scatterlists. + + Use of this API will taint the kernel. + endmenu menu "Boot options" |