X-Git-Url: https://git.stricted.de/?a=blobdiff_plain;f=kernel%2Ftrace%2Ftrace_stack.c;h=7eca011245b8759031423c98b6046b01d2193851;hb=HEAD;hp=b20428c5efe26ba54ef2a6e83bb9ad711a9f85b5;hpb=e4bf063cb8b5e3648aa9917692b185068ab8ba23;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index b20428c5efe2..7eca011245b8 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -44,12 +44,44 @@ static unsigned long max_stack_size;
 static arch_spinlock_t max_stack_lock =
 	(arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;
 
+static int stack_trace_disabled __read_mostly;
 static DEFINE_PER_CPU(int, trace_active);
 static DEFINE_MUTEX(stack_sysctl_mutex);
 
 int stack_tracer_enabled;
 static int last_stack_tracer_enabled;
 
+/*LCH add for stack overflow debug */
+#if defined (CONFIG_MTK_AEE_FEATURE) && defined (CONFIG_MT_ENG_BUILD)
+#include <linux/aee.h>
+#include <linux/thread_info.h>
+/*768=sizeof(struct thread_info),1600 for buffer*/ 
+static unsigned long stack_overflow_thd = THREAD_SIZE-768-1600;
+module_param_named(stack_overflow_thd, stack_overflow_thd, ulong, S_IRUGO | S_IWUSR);
+
+static void dump_max_stack_trace(void) {
+    long i = 0;
+    int size;
+    printk(KERN_INFO "        Depth    Size   Location"
+			   "    (%d entries)\n"
+			   "        -----    ----   --------\n",
+			   max_stack_trace.nr_entries - 1);
+	
+	for (i=0; i<max_stack_trace.nr_entries; i++) {
+	    if (stack_dump_trace[i] == ULONG_MAX)
+		    continue;
+
+	    if (i+1 == max_stack_trace.nr_entries ||
+	        stack_dump_trace[i+1] == ULONG_MAX)
+		    size = stack_dump_index[i];
+	    else
+		    size = stack_dump_index[i] - stack_dump_index[i+1];
+
+	    printk(KERN_INFO "%3ld) %8d   %5d   %pS\n", i, stack_dump_index[i], size, (void *)stack_dump_trace[i]);
+    }
+}
+#endif
+
 static inline void
 check_stack(unsigned long ip, unsigned long *stack)
 {
@@ -64,6 +96,19 @@ check_stack(unsigned long ip, unsigned long *stack)
 	/* Remove the frame of the tracer */
 	this_size -= frame_size;
 
+    /*LCH add for stack overflow debug, stack_tracer_enabled:
+     * 0:disable, 
+     * 1:record stack_max_size and stack_trace
+     * 2:only for overflow trigger kernel warning */
+#if defined (CONFIG_MTK_AEE_FEATURE) && defined (CONFIG_MT_ENG_BUILD)
+    if (stack_tracer_enabled == 2) {
+	    if (this_size < stack_overflow_thd) {
+	        return;
+	    }
+	    stack_trace_disabled = 1;
+	    max_stack_size = 0;
+    }
+#endif
 	if (this_size <= max_stack_size)
 		return;
 
@@ -147,6 +192,12 @@ check_stack(unsigned long ip, unsigned long *stack)
  out:
 	arch_spin_unlock(&max_stack_lock);
 	local_irq_restore(flags);
+#if defined (CONFIG_MTK_AEE_FEATURE) && defined (CONFIG_MT_ENG_BUILD)
+    if (stack_tracer_enabled == 2) {
+        dump_max_stack_trace();
+	    aee_kernel_warning("[STACK_OVERFLOW_DEBUG]", "stack_size:%d", max_stack_size);
+	}
+#endif
 }
 
 static void
@@ -156,6 +207,9 @@ stack_trace_call(unsigned long ip, unsigned long parent_ip,
 	unsigned long stack;
 	int cpu;
 
+	if (unlikely(stack_trace_disabled))
+		return;
+
 	preempt_disable_notrace();
 
 	cpu = raw_smp_processor_id();
@@ -419,9 +473,15 @@ static __init int enable_stacktrace(char *str)
 {
 	if (strncmp(str, "_filter=", 8) == 0)
 		strncpy(stack_trace_filter_buf, str+8, COMMAND_LINE_SIZE);
-
+		
+/*LCH add for stack overflow debug */
+#if defined (CONFIG_MTK_AEE_FEATURE) && defined (CONFIG_MT_ENG_BUILD)
+	stack_tracer_enabled = 2;
+	last_stack_tracer_enabled = 2;
+#else
 	stack_tracer_enabled = 1;
 	last_stack_tracer_enabled = 1;
+#endif
 	return 1;
 }
 __setup("stacktrace", enable_stacktrace);