Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin: (27 commits)
  Blackfin: hook up new rt_tgsigqueueinfo syscall
  Blackfin: improve CLKIN_HZ config default
  Blackfin: initial support for ftrace grapher
  Blackfin: initial support for ftrace
  Blackfin: enable support for LOCKDEP
  Blackfin: add preliminary support for STACKTRACE
  Blackfin: move custom sections into sections.h
  Blackfin: punt unused/wrong mutex-dec.h
  Blackfin: add support for irqflags
  Blackfin: add support for bzip2/lzma compressed kernel images
  Blackfin: convert Kconfig style to def_bool
  Blackfin: bf548-ezkit: update smsc911x resources
  Blackfin: update aedos-ipipe code to upstream 1.10-00
  Blackfin: bf537-stamp: update ADP5520 resources
  Blackfin: bf518f-ezbrd: fix SPI CS for SPI flash
  Blackfin: define SPI IRQ in board resources
  Blackfin: do not configure the UART early if on wrong processor
  Blackfin: fix deadlock in SMP IPI handler
  Blackfin: fix flag storage for irq funcs
  Blackfin: push down exception oops checking
  ...

1 files changed, 53 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/stacktrace.c b/arch/blackfin/kernel/stacktrace.c
new file mode 100644
index 00000000000..30301e1eace
--- /dev/null
+++ b/arch/blackfin/kernel/stacktrace.c
@@ -0,0 +1,53 @@
+/*
+ * Blackfin stacktrace code (mostly copied from avr32)
+ *
+ * Copyright 2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <linux/thread_info.h>
+#include <linux/module.h>
+
+register unsigned long current_frame_pointer asm("FP");
+
+struct stackframe {
+	unsigned long fp;
+	unsigned long rets;
+};
+
+/*
+ * Save stack-backtrace addresses into a stack_trace buffer.
+ */
+void save_stack_trace(struct stack_trace *trace)
+{
+	unsigned long low, high;
+	unsigned long fp;
+	struct stackframe *frame;
+	int skip = trace->skip;
+
+	low = (unsigned long)task_stack_page(current);
+	high = low + THREAD_SIZE;
+	fp = current_frame_pointer;
+
+	while (fp >= low && fp <= (high - sizeof(*frame))) {
+		frame = (struct stackframe *)fp;
+
+		if (skip) {
+			skip--;
+		} else {
+			trace->entries[trace->nr_entries++] = frame->rets;
+			if (trace->nr_entries >= trace->max_entries)
+				break;
+		}
+
+		/*
+		 * The next frame must be at a higher address than the
+		 * current frame.
+		 */
+		low = fp + sizeof(*frame);
+		fp = frame->fp;
+	}
+}
+EXPORT_SYMBOL_GPL(save_stack_trace);