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

* master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6:
  [SPARC64]: Fix several kprobes bugs.
  [SPARC64]: Update defconfig.
  [SPARC64]: dma remove extra brackets
  [SPARC{32,64}]: Propagate ptrace_traceme() return value.
  [SPARC64]: Replace kmalloc+memset with kzalloc
  [SPARC]: Check kzalloc() return value in SUN4D irq/iommu init.
  [SPARC]: Replace kmalloc+memset with kzalloc
  [SPARC64]: Run ctrl-alt-del action for sun4v powerdown request.
  [SPARC64]: Unaligned accesses to userspace are hard errors.
  [SPARC64]: Call do_mathemu on illegal instruction traps too.
  [SPARC64]: Update defconfig.
  [SPARC64]: Add irqtrace/stacktrace/lockdep support.

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
new file mode 100644
index 00000000000..c4d15f2762b
--- /dev/null
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -0,0 +1,41 @@
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/thread_info.h>
+#include <asm/ptrace.h>
+
+void save_stack_trace(struct stack_trace *trace, struct task_struct *task)
+{
+	unsigned long ksp, fp, thread_base;
+	struct thread_info *tp;
+
+	if (!task)
+		task = current;
+	tp = task_thread_info(task);
+	if (task == current) {
+		flushw_all();
+		__asm__ __volatile__(
+			"mov	%%fp, %0"
+			: "=r" (ksp)
+		);
+	} else
+		ksp = tp->ksp;
+
+	fp = ksp + STACK_BIAS;
+	thread_base = (unsigned long) tp;
+	do {
+		struct reg_window *rw;
+
+		/* Bogus frame pointer? */
+		if (fp < (thread_base + sizeof(struct thread_info)) ||
+		    fp >= (thread_base + THREAD_SIZE))
+			break;
+
+		rw = (struct reg_window *) fp;
+		if (trace->skip > 0)
+			trace->skip--;
+		else
+			trace->entries[trace->nr_entries++] = rw->ins[7];
+
+		fp = rw->ins[6] + STACK_BIAS;
+	} while (trace->nr_entries < trace->max_entries);
+}