kernel/lib: add additional debug capabilites for data corruption
Data corruptions in the kernel often end up in system crashes that
are easier to debug closer to the time of detection. Specifically,
if we do not panic immediately after lock or list corruptions have been
detected, the problem context is lost in the ensuing system mayhem.
Add support for allowing system crash immediately after such corruptions
are detected. The CONFIG option controls the enabling/disabling of the
feature.
Change-Id: I9b2eb62da506a13007acff63e85e9515145909ff
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
diff --git a/lib/list_debug.c b/lib/list_debug.c
index 982b850..6a039a6 100644
--- a/lib/list_debug.c
+++ b/lib/list_debug.c
@@ -10,6 +10,7 @@
#include <linux/list.h>
#include <linux/bug.h>
#include <linux/kernel.h>
+#include <linux/bug.h>
/*
* Insert a new entry between two known consecutive entries.
@@ -30,6 +31,10 @@
"list_add corruption. prev->next should be "
"next (%p), but was %p. (prev=%p).\n",
next, prev->next, prev);
+
+ BUG_ON(((prev->next != next) || (next->prev != prev)) &&
+ PANIC_CORRUPTION);
+
next->prev = new;
new->next = next;
new->prev = prev;
@@ -55,8 +60,10 @@
"but was %p\n", entry, prev->next) ||
WARN(next->prev != entry,
"list_del corruption. next->prev should be %p, "
- "but was %p\n", entry, next->prev))
+ "but was %p\n", entry, next->prev)) {
+ BUG_ON(PANIC_CORRUPTION);
return;
+ }
__list_del(prev, next);
}