linux-kernel - [PATCH 4.19 105/139] sparc/function_graph: Simplify with function_graph

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Date:   Tue,  4 Dec 2018 11:49:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, stable@...nel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 4.19 105/139] sparc/function_graph: Simplify with function_graph_enter()

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Steven Rostedt (VMware) <rostedt@...dmis.org>

commit 9c4bf5e0db164f330a2d3e128e9832661f69f0e9 upstream.

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 sparc 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: "David S. Miller" <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
Cc: stable@...nel.org
Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/sparc/kernel/ftrace.c |   11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

--- a/arch/sparc/kernel/ftrace.c
+++ b/arch/sparc/kernel/ftrace.c
@@ -126,20 +126,11 @@ unsigned long prepare_ftrace_return(unsi
 				    unsigned long frame_pointer)
 {
 	unsigned long return_hooker = (unsigned long) &return_to_handler;
-	struct ftrace_graph_ent trace;

 	if (unlikely(atomic_read(&current->tracing_graph_pause)))
 		return parent + 8UL;

-	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 parent + 8UL;
-
-	if (ftrace_push_return_trace(parent, self_addr, &trace.depth,
-				     frame_pointer, NULL) == -EBUSY)
+	if (function_graph_enter(parent, self_addr, frame_pointer, NULL))
 		return parent + 8UL;

 	return return_hooker;