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authorMatt Fleming <matt@console-pimps.org>2009-07-11 03:00:23 +0200
committerPaul Mundt <lethal@linux-sh.org>2009-07-11 03:07:58 +0200
commitb99610fb9cdf390965c62c22322596d961591160 (patch)
tree0c836b4390370b4848f151e3b3cbe27e6d8b48e2 /arch/sh/Kconfig.debug
parentsh: Add ftrace syscall tracing support (diff)
downloadlinux-b99610fb9cdf390965c62c22322596d961591160.tar.xz
linux-b99610fb9cdf390965c62c22322596d961591160.zip
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 39224b57c6ef..52a132c24aab 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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