Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc: Define ARCH_SLAB_MINALIGN
  drivers/sbus/char/flash.c: flash_read should update ppos instead of file->f_pos
  sparc64: Fix stack dumping and tracing when function graph is enabled.
  sparc64: Show stack backtrace from show_regs() just like other platforms.

1 files changed, 22 insertions, 1 deletions

diff --git a/arch/sparc/kernel/stacktrace.c b/arch/sparc/kernel/stacktrace.c
index acb12f673757..3e0815349630 100644
--- a/arch/sparc/kernel/stacktrace.c
+++ b/arch/sparc/kernel/stacktrace.c
@@ -1,6 +1,7 @@
 #include <linux/sched.h>
 #include <linux/stacktrace.h>
 #include <linux/thread_info.h>
+#include <linux/ftrace.h>
 #include <linux/module.h>
 #include <asm/ptrace.h>
 #include <asm/stacktrace.h>
@@ -12,6 +13,10 @@ static void __save_stack_trace(struct thread_info *tp,
                                bool skip_sched)
 {
         unsigned long ksp, fp;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        struct task_struct *t;
+        int graph = 0;
+#endif
 
         if (tp == current_thread_info()) {
                 stack_trace_flush();
@@ -21,6 +26,9 @@ static void __save_stack_trace(struct thread_info *tp,
         }
 
         fp = ksp + STACK_BIAS;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+        t = tp->task;
+#endif
         do {
                 struct sparc_stackf *sf;
                 struct pt_regs *regs;
@@ -44,8 +52,21 @@ static void __save_stack_trace(struct thread_info *tp,
 
                 if (trace->skip > 0)
                         trace->skip--;
-                else if (!skip_sched || !in_sched_functions(pc))
+                else if (!skip_sched || !in_sched_functions(pc)) {
                         trace->entries[trace->nr_entries++] = pc;
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+                        if ((pc + 8UL) == (unsigned long) &return_to_handler) {
+                                int index = t->curr_ret_stack;
+                                if (t->ret_stack && index >= graph) {
+                                        pc = t->ret_stack[index - graph].ret;
+                                        if (trace->nr_entries <
+                                            trace->max_entries)
+                                                trace->entries[trace->nr_entries++] = pc;
+                                        graph++;
+                                }
+                        }
+#endif
+                }
         } while (trace->nr_entries < trace->max_entries);
 }