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-rw-r--r--arch/arm/mm/Kconfig6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index a3a4589ec73b..fc439c2c16f8 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -631,7 +631,11 @@ config CPU_USE_DOMAINS
bool
help
This option enables or disables the use of domain switching
- via the set_fs() function.
+ using the DACR (domain access control register) to protect memory
+ domains from each other. In Linux we use three domains: kernel, user
+ and IO. The domains are used to protect userspace from kernelspace
+ and to handle IO-space as a special type of memory by assigning
+ manager or client roles to running code (such as a process).
config CPU_V7M_NUM_IRQ
int "Number of external interrupts connected to the NVIC"