powerpc: tm: Enable transactional memory (TM) lazily for userspace

[cascardo/linux.git] / arch / Kconfig

diff --git a/arch/Kconfig b/arch/Kconfig
index bd8056b..e9c9334 100644 (file)
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -461,6 +461,15 @@ config CC_STACKPROTECTOR_STRONG
 
 endchoice
 
+config HAVE_ARCH_WITHIN_STACK_FRAMES
+       bool
+       help
+         An architecture should select this if it can walk the kernel stack
+         frames to determine if an object is part of either the arguments
+         or local variables (i.e. that it excludes saved return addresses,
+         and similar) by implementing an inline arch_within_stack_frames(),
+         which is used by CONFIG_HARDENED_USERCOPY.
+
 config HAVE_CONTEXT_TRACKING
        bool
        help