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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2018-11-18 17:26:35 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-11-27 20:30:43 -0500
commitd48ebb24866edea2c35be02a878f25bc65529370 (patch)
tree1ebe0be367d22f1c090dcb84939c8c3cbe308b7f /arch/nds32
parentMIPS: function_graph: Simplify with function_graph_enter() (diff)
downloadlinux-dev-d48ebb24866edea2c35be02a878f25bc65529370.tar.xz
linux-dev-d48ebb24866edea2c35be02a878f25bc65529370.zip
nds32: function_graph: Simplify with function_graph_enter()
The function_graph_enter() function does the work of calling the function graph hook function and the management of the shadow stack, simplifying the work done in the architecture dependent prepare_ftrace_return(). Have nds32 use the new code, and remove the shadow stack management as well as having to set up the trace structure. This is needed to prepare for a fix of a design bug on how the curr_ret_stack is used. Cc: Greentime Hu <greentime@andestech.com> Cc: stable@kernel.org Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback") Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'arch/nds32')
-rw-r--r--arch/nds32/kernel/ftrace.c18
1 files changed, 2 insertions, 16 deletions
diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
index a0a9679ad5de..8a41372551ff 100644
--- a/arch/nds32/kernel/ftrace.c
+++ b/arch/nds32/kernel/ftrace.c
@@ -211,29 +211,15 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
unsigned long frame_pointer)
{
unsigned long return_hooker = (unsigned long)&return_to_handler;
- struct ftrace_graph_ent trace;
unsigned long old;
- int err;
if (unlikely(atomic_read(&current->tracing_graph_pause)))
return;
old = *parent;
- trace.func = self_addr;
- trace.depth = current->curr_ret_stack + 1;
-
- /* Only trace if the calling function expects to */
- if (!ftrace_graph_entry(&trace))
- return;
-
- err = ftrace_push_return_trace(old, self_addr, &trace.depth,
- frame_pointer, NULL);
-
- if (err == -EBUSY)
- return;
-
- *parent = return_hooker;
+ if (!function_graph_enter(old, self_addr, frame_pointer, NULL))
+ *parent = return_hooker;
}
noinline void ftrace_graph_caller(void)