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authorMatt Fleming <matt@console-pimps.org>2009-07-11 01:00:23 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-07-11 10:07:58 +0900
commitb99610fb9cdf390965c62c22322596d961591160 (patch)
tree0c836b4390370b4848f151e3b3cbe27e6d8b48e2 /arch/sh/Kconfig.debug
parentc652d780c9cf7f860141de232b37160fe013feca (diff)
downloadvexpress-lsk-b99610fb9cdf390965c62c22322596d961591160.tar.gz
sh: Provide diagnostic kernel stack checks
Enable kernel stack checking code in both the dynamic ftrace and mcount code paths. Check the stack to see if it's overflowing and make sure that the stack pointer contains an address that's either in init_stack or after the bss. Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/Kconfig.debug')
-rw-r--r--arch/sh/Kconfig.debug11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index 39224b57c6e..52a132c24aa 100644
--- a/arch/sh/Kconfig.debug
+++ b/arch/sh/Kconfig.debug
@@ -123,4 +123,15 @@ config SH64_SR_WATCH
bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
depends on SUPERH64
+config STACK_DEBUG
+ bool "Enable diagnostic checks of the kernel stack"
+ depends on FUNCTION_TRACER
+ select DEBUG_STACKOVERFLOW
+ default n
+ help
+ This option allows checks to be performed on the kernel stack
+ at runtime. Saying Y here will add overhead to every function
+ call and will therefore incur a major performance hit. Most
+ users should say N.
+
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