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authorSteven Rostedt <srostedt@redhat.com>2009-02-09 10:54:03 -0800
committerSteven Rostedt <srostedt@redhat.com>2009-02-18 13:43:04 -0500
commit712406a6bf59ebf4a00358bb59a4a2a1b2953d90 (patch)
tree5bea439ccacde69ba71c5da8e8e307c2d343aa93 /arch/x86/kernel/ftrace.c
parentd2f8d7ee1a9b4650b4e43325b321801264f7c37a (diff)
tracing/function-graph-tracer: make arch generic push pop functions
There is nothing really arch specific of the push and pop functions used by the function graph tracer. This patch moves them to generic code. Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Diffstat (limited to 'arch/x86/kernel/ftrace.c')
-rw-r--r--arch/x86/kernel/ftrace.c75
1 files changed, 1 insertions, 74 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 231bdd3c5b1..76f7141e0f9 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -389,79 +389,6 @@ void ftrace_nmi_exit(void)
#endif /* !CONFIG_DYNAMIC_FTRACE */
-/* Add a function return address to the trace stack on thread info.*/
-static int push_return_trace(unsigned long ret, unsigned long long time,
- unsigned long func, int *depth)
-{
- int index;
-
- if (!current->ret_stack)
- return -EBUSY;
-
- /* The return trace stack is full */
- if (current->curr_ret_stack == FTRACE_RETFUNC_DEPTH - 1) {
- atomic_inc(&current->trace_overrun);
- return -EBUSY;
- }
-
- index = ++current->curr_ret_stack;
- barrier();
- current->ret_stack[index].ret = ret;
- current->ret_stack[index].func = func;
- current->ret_stack[index].calltime = time;
- *depth = index;
-
- return 0;
-}
-
-/* Retrieve a function return address to the trace stack on thread info.*/
-static void pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret)
-{
- int index;
-
- index = current->curr_ret_stack;
-
- if (unlikely(index < 0)) {
- ftrace_graph_stop();
- WARN_ON(1);
- /* Might as well panic, otherwise we have no where to go */
- *ret = (unsigned long)panic;
- return;
- }
-
- *ret = current->ret_stack[index].ret;
- trace->func = current->ret_stack[index].func;
- trace->calltime = current->ret_stack[index].calltime;
- trace->overrun = atomic_read(&current->trace_overrun);
- trace->depth = index;
- barrier();
- current->curr_ret_stack--;
-
-}
-
-/*
- * Send the trace to the ring-buffer.
- * @return the original return address.
- */
-unsigned long ftrace_return_to_handler(void)
-{
- struct ftrace_graph_ret trace;
- unsigned long ret;
-
- pop_return_trace(&trace, &ret);
- trace.rettime = cpu_clock(raw_smp_processor_id());
- ftrace_graph_return(&trace);
-
- if (unlikely(!ret)) {
- ftrace_graph_stop();
- WARN_ON(1);
- /* Might as well panic. What else to do? */
- ret = (unsigned long)panic;
- }
-
- return ret;
-}
-
/*
* Hook the return address and push it in the stack of return addrs
* in current thread info.
@@ -521,7 +448,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
calltime = cpu_clock(raw_smp_processor_id());
- if (push_return_trace(old, calltime,
+ if (ftrace_push_return_trace(old, calltime,
self_addr, &trace.depth) == -EBUSY) {
*parent = old;
return;