stap autoconf test for kernel stack trace support

	* buildrun.cxx (compile_pass): Add autoconf line for stack trace
	test, which defines STAPCONF_KERNEL_STACKTRACE.
	* runtime/autoconf-save-stack-trace.c: New file.
	* runtime/stack.c : Use STAPCONF_KERNEL_STACKTRACE instead of
	tests for kernel configuration and versions.
	* runtime/stack-i386.c : ditto
	* runtime/stack-x86_64.c : ditto

1 files changed, 22 insertions, 0 deletions

diff --git a/runtime/autoconf-save-stack-trace.c b/runtime/autoconf-save-stack-trace.c
new file mode 100644
index 00000000..39ded684
--- /dev/null
+++ b/runtime/autoconf-save-stack-trace.c
@@ -0,0 +1,22 @@
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/stacktrace.h>
+#include <asm/stacktrace.h>
+
+void foo(struct task_struct *foo)
+{
+  struct stack_trace trace;
+  unsigned long backtrace[20];
+  memset(&trace, 0, sizeof(trace));
+  trace.entries = &backtrace[0];
+  trace.max_entries = 20;
+  trace.skip = 0;
+  save_stack_trace_tsk(tsk, &trace);
+}
+
+static const struct stacktrace_ops print_stack_ops;
+
+void dumper(struct task_struct *foo)
+{
+  dump_trace(foo, 0, 0, 0, &print_stack_ops, 0);
+}