[PATCH 1/5] mm: add poisoning basics

[Sasha Levin]

Add poisining basics along with a config option to enable poisoning.

Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
 include/linux/poison.h | 6 ++++++
 lib/Kconfig.debug      | 9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/linux/poison.h b/include/linux/poison.h
index 2110a81..db4d03e 100644
--- a/include/linux/poison.h
+++ b/include/linux/poison.h
@@ -86,4 +86,10 @@
 /********** sound/oss/ **********/
 #define OSS_POISON_FREE		0xAB
 
+/********** include/linux/mm_types.h **********/
+#ifdef CONFIG_DEBUG_VM_POISON
+#define MM_POISON_BEGIN		0x89ABCDEF
+#define MM_POISON_END		0xFEDCBA98
+#endif /* DEBUG_VM_POISON */
+
 #endif
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c366c8a..3b82772 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -543,6 +543,15 @@ config DEBUG_VM_RB
 
 	  If unsure, say N.
 
+config DEBUG_VM_POISON
+	bool "Poison VM structures"
+	depends on DEBUG_VM
+	help
+	  Add poison to the beggining and end of various VM structure to
+	  detect memory corruption in VM management code.
+
+	  If unsure, say N.
+
 config DEBUG_VIRTUAL
 	bool "Debug VM translations"
 	depends on DEBUG_KERNEL && X86
-- 
1.9.1

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