Merge remote-tracking branch 'spi/fix/core' into spi-linus

[firefly-linux-kernel-4.4.55.git] / arch / arm64 / Kconfig.debug

diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug
index 835c559786bda923fe0cb8616b3031932a86bb21..d10ec334c93b4a3f8db194e1a929c711e5dbcf90 100644 (file)
--- a/arch/arm64/Kconfig.debug
+++ b/arch/arm64/Kconfig.debug
@@ -6,6 +6,20 @@ config FRAME_POINTER
        bool
        default y
 
+config STRICT_DEVMEM
+       bool "Filter access to /dev/mem"
+       depends on MMU
+       help
+         If this option is disabled, you allow userspace (root) access to all
+         of memory, including kernel and userspace memory. Accidental
+         access to this is obviously disastrous, but specific access can
+         be used by people debugging the kernel.
+
+         If this option is switched on, the /dev/mem file only allows
+         userspace access to memory mapped peripherals.
+
+         If in doubt, say Y.
+
 config EARLY_PRINTK
        bool "Early printk support"
        default y