sparc64: Add save_stack_trace_tsk().

And this allows us to indicate HAVE_LATENCYTOP_SUPPORT.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 9 deletions

diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
index 4e21d4a57d3b..acb12f673757 100644
--- a/arch/sparc64/kernel/stacktrace.c
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -7,17 +7,18 @@
 
 #include "kstack.h"
 
-void save_stack_trace(struct stack_trace *trace)
+static void __save_stack_trace(struct thread_info *tp,
+                               struct stack_trace *trace,
+                               bool skip_sched)
 {
-        struct thread_info *tp = task_thread_info(current);
         unsigned long ksp, fp;
 
-        stack_trace_flush();
-
-        __asm__ __volatile__(
-                "mov    %%fp, %0"
-                : "=r" (ksp)
-        );
+        if (tp == current_thread_info()) {
+                stack_trace_flush();
+                __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
+        } else {
+                ksp = tp->ksp;
+        }
 
         fp = ksp + STACK_BIAS;
         do {
@@ -43,8 +44,21 @@ void save_stack_trace(struct stack_trace *trace)
 
                 if (trace->skip > 0)
                         trace->skip--;
-                else
+                else if (!skip_sched || !in_sched_functions(pc))
                         trace->entries[trace->nr_entries++] = pc;
         } while (trace->nr_entries < trace->max_entries);
 }
+
+void save_stack_trace(struct stack_trace *trace)
+{
+        __save_stack_trace(current_thread_info(), trace, false);
+}
 EXPORT_SYMBOL_GPL(save_stack_trace);
+
+void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
+{
+        struct thread_info *tp = task_thread_info(tsk);
+
+        __save_stack_trace(tp, trace, true);
+}
+EXPORT_SYMBOL_GPL(save_stack_trace_tsk);