ARC: Make arc_unwind_core accessible externally
The arc unwinder can also be used for perf callchains.
Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c
index 9ce47cf..6492507 100644
--- a/arch/arc/kernel/stacktrace.c
+++ b/arch/arc/kernel/stacktrace.c
@@ -43,6 +43,10 @@
struct pt_regs *regs,
struct unwind_frame_info *frame_info)
{
+ /*
+ * synchronous unwinding (e.g. dump_stack)
+ * - uses current values of SP and friends
+ */
if (tsk == NULL && regs == NULL) {
unsigned long fp, sp, blink, ret;
frame_info->task = current;
@@ -61,6 +65,11 @@
frame_info->regs.r63 = ret;
frame_info->call_frame = 0;
} else if (regs == NULL) {
+ /*
+ * Asynchronous unwinding of sleeping task
+ * - Gets SP etc from task's pt_regs (saved bottom of kernel
+ * mode stack of task)
+ */
frame_info->task = tsk;
@@ -83,6 +92,10 @@
frame_info->call_frame = 0;
} else {
+ /*
+ * Asynchronous unwinding of intr/exception
+ * - Just uses the pt_regs passed
+ */
frame_info->task = tsk;
frame_info->regs.r27 = regs->fp;
@@ -95,7 +108,7 @@
#endif
-static noinline unsigned int
+notrace noinline unsigned int
arc_unwind_core(struct task_struct *tsk, struct pt_regs *regs,
int (*consumer_fn) (unsigned int, void *), void *arg)
{