kmemleak : Make kmemleak_stack_scan optional using config
Currently we have kmemleak_stack_scan enabled by default.
This can hog the cpu with pre-emption disabled for a long
time starving other tasks.
Make this optional at compile time, since if required
we can always write to sysfs entry and enable this option.
Change-Id: Ie30447861c942337c7ff25ac269b6025a527e8eb
Signed-off-by: Vignesh Radhakrishnan <vigneshr@codeaurora.org>
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 17dd883..7829a18 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -226,8 +226,20 @@
static unsigned long jiffies_last_scan;
/* delay between automatic memory scannings */
static signed long jiffies_scan_wait;
-/* enables or disables the task stacks scanning */
+
+/*
+ * Enables or disables the task stacks scanning.
+ * Set to 1 if at compile time we want it enabled.
+ * Else set to 0 to have it disabled by default.
+ * This can be enabled by writing to "stack=on" using
+ * kmemleak debugfs entry.
+ */
+#ifdef CONFIG_DEBUG_TASK_STACK_SCAN_OFF
+static int kmemleak_stack_scan;
+#else
static int kmemleak_stack_scan = 1;
+#endif
+
/* protects the memory scanning, parameters and debug/kmemleak file access */
static DEFINE_MUTEX(scan_mutex);
/* setting kmemleak=on, will set this var, skipping the disable */