Add poisining basics along with a config option to enable poisoning.
Signed-off-by: Sasha Levin <sasha.le...@oracle.com>
---
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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