Add Kconfig and Makefile infrastructure.

The implementation is located under `mm/kstackwatch/`.

Signed-off-by: Jinchao Wang <redacted>
---
 mm/Kconfig.debug             |  8 ++++++++
 mm/Makefile                  |  1 +
 mm/kstackwatch/Makefile      |  2 ++
 mm/kstackwatch/kernel.c      | 23 +++++++++++++++++++++++
 mm/kstackwatch/kstackwatch.h |  5 +++++
 mm/kstackwatch/stack.c       |  1 +
 mm/kstackwatch/watch.c       |  1 +
 7 files changed, 41 insertions(+)
 create mode 100644 mm/kstackwatch/Makefile
 create mode 100644 mm/kstackwatch/kernel.c
 create mode 100644 mm/kstackwatch/kstackwatch.h
 create mode 100644 mm/kstackwatch/stack.c
 create mode 100644 mm/kstackwatch/watch.c

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 32b65073d0cc..89be351c0be5 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug

@@ -309,3 +309,11 @@ config PER_VMA_LOCK_STATS
 	  overhead in the page fault path.
 
 	  If in doubt, say N.
+
+config KSTACK_WATCH
+	bool "Kernel Stack Watch"
+	depends on HAVE_HW_BREAKPOINT && KPROBES && FPROBE && STACKTRACE
+	help
+	  A lightweight real-time debugging tool to detect stack corrupting.