From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:43956 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727104AbeLDK7Q (ORCPT ); Tue, 4 Dec 2018 05:59:16 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Greentime Hu , stable@kernel.org, Masami Hiramatsu , "Steven Rostedt (VMware)" Subject: [PATCH 4.19 102/139] nds32: function_graph: Simplify with function_graph_enter() Date: Tue, 4 Dec 2018 11:49:43 +0100 Message-Id: <20181204103654.710078599@linuxfoundation.org> In-Reply-To: <20181204103649.950154335@linuxfoundation.org> References: <20181204103649.950154335@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steven Rostedt (VMware) commit d48ebb24866edea2c35be02a878f25bc65529370 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 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 Cc: stable@kernel.org Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback") Reviewed-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Greg Kroah-Hartman --- arch/nds32/kernel/ftrace.c | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) --- a/arch/nds32/kernel/ftrace.c +++ b/arch/nds32/kernel/ftrace.c @@ -211,29 +211,15 @@ void prepare_ftrace_return(unsigned long 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(¤t->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)