commit 0bbb80098decc9c4c43a1800538007d86b600bba
Author: Josh Stone <jistone@redhat.com>
Date:   Tue Jun 7 11:23:13 2011 -0700

    stapconf: Conditionalize stacktrace_ops.warning{,_symbol}
    
    Kernel commit 449a66f removed these fields.
    
    * buildrun.cxx: Include the new test.
    * runtime/autoconf-stacktrace_ops-warning.c: Check the warning field.
    * runtime/stack.c: Conditionalize the warning initialization.

diff --git a/buildrun.cxx b/buildrun.cxx
index 0bebc35..79f8818 100644
--- a/buildrun.cxx
+++ b/buildrun.cxx
@@ -215,6 +215,8 @@ compile_pass (systemtap_session& s)
   output_autoconf(s, o, "autoconf-ring_buffer-flags.c", "STAPCONF_RING_BUFFER_FLAGS", NULL);
   output_autoconf(s, o, "autoconf-kallsyms-on-each-symbol.c", "STAPCONF_KALLSYMS_ON_EACH_SYMBOL", NULL);
   output_autoconf(s, o, "autoconf-walk-stack.c", "STAPCONF_WALK_STACK", NULL);
+  output_autoconf(s, o, "autoconf-stacktrace_ops-warning.c",
+                  "STAPCONF_STACKTRACE_OPS_WARNING", NULL);
   output_autoconf(s, o, "autoconf-mm-context-vdso.c", "STAPCONF_MM_CONTEXT_VDSO", NULL);
   output_autoconf(s, o, "autoconf-blk-types.c", "STAPCONF_BLK_TYPES", NULL);
   output_autoconf(s, o, "autoconf-perf-structpid.c", "STAPCONF_PERF_STRUCTPID", NULL);
diff --git a/runtime/autoconf-stacktrace_ops-warning.c b/runtime/autoconf-stacktrace_ops-warning.c
new file mode 100644
index 0000000..9c00f05
--- /dev/null
+++ b/runtime/autoconf-stacktrace_ops-warning.c
@@ -0,0 +1,10 @@
+/* Some kernels have warning fields in stacktrace_ops. */
+#include <linux/sched.h>
+#include <asm/stacktrace.h>
+
+void foo (void)
+{
+  struct stacktrace_ops t;
+  t.warning = 0;
+  (void) t;
+}
diff --git a/runtime/stack.c b/runtime/stack.c
index 68a7e4f..b2d5d1d 100644
--- a/runtime/stack.c
+++ b/runtime/stack.c
@@ -73,6 +73,7 @@ struct print_stack_data
         int level;
 };
 
+#if defined(STAPCONF_STACKTRACE_OPS_WARNING)
 static void print_stack_warning(void *data, char *msg)
 {
 }
@@ -81,6 +82,7 @@ static void
 print_stack_warning_symbol(void *data, char *msg, unsigned long symbol)
 {
 }
+#endif
 
 static int print_stack_stack(void *data, char *name)
 {
@@ -95,8 +97,10 @@ static void print_stack_address(void *data, unsigned long addr, int reliable)
 }
 
 static const struct stacktrace_ops print_stack_ops = {
+#if defined(STAPCONF_STACKTRACE_OPS_WARNING)
 	.warning = print_stack_warning,
 	.warning_symbol = print_stack_warning_symbol,
+#endif
 	.stack = print_stack_stack,
 	.address = print_stack_address,
 #if defined(STAPCONF_WALK_STACK)