[PATCH] arc: kernel: export symbol for save_stack_trace() in stacktrace.c

[Chen Gang <gang.chen@asianux.com>]

Need export its symbol just like other architectures done, or can not
pass compiling with allmodconfig, the related error:

    MODPOST 2994 modules
  ERROR: "save_stack_trace" [kernel/backtracetest.ko] undefined!
  ERROR: "save_stack_trace" [drivers/md/persistent-data/dm-persistent-data.ko] undefined!


Signed-off-by: Chen Gang <gang.chen@asianux.com>
---
 arch/arc/kernel/stacktrace.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/arc/kernel/stacktrace.c b/arch/arc/kernel/stacktrace.c
index f8b7d88..607c6e4 100644
--- a/arch/arc/kernel/stacktrace.c
+++ b/arch/arc/kernel/stacktrace.c
@@ -244,4 +244,5 @@ void save_stack_trace(struct stack_trace *trace)
 {
 	arc_unwind_core(current, NULL, __collect_all, trace);
 }
+EXPORT_SYMBOL_GPL(save_stack_trace);
 #endif
-- 
1.7.7.6