On Thu, 2009-11-19 at 15:44 +0000, Andrew Haley wrote:
> We're aligning the stack properly, as per the ABI requirements. Can't
> you just fix the tracer?
Unfortunately, this is the only fix we have:
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index b416512..cd39064 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -143,7 +143,6 @@ config FUNCTION_GRAPH_TRACER
bool "Kernel Function Graph Tracer"
depends on HAVE_FUNCTION_GRAPH_TRACER
depends on FUNCTION_TRACER
- depends on !X86_32 || !CC_OPTIMIZE_FOR_SIZE
default y
help
Enable the kernel to trace a function at both its return
diff --git a/kernel/trace/trace_functions_graph.c
b/kernel/trace/trace_functions_graph.c
index 45e6c01..50c2251 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1070,6 +1070,11 @@ static __init int init_graph_trace(void)
{
max_bytes_for_cpu = snprintf(NULL, 0, "%d", nr_cpu_ids - 1);
+#if defined(CONFIG_X86_32 && __GNUC__ >= 4 && __GNUC_MINOR__ >= 4)
+ pr_info("WARNING: GCC 4.4.X breaks the function graph tracer on i686.\n"
+ " The function graph tracer will be disabled.\n");
+ return -1;
+#endif
return register_tracer(&graph_trace);
}
-- Steve
