linux-kernel - Re: [PATCH] arm64: ftrace: function_graph: dump real return addr in call trace

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Message-ID: <6277407.jveniKQDxt@wuerfel>
Date:	Thu, 15 Oct 2015 14:46:16 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Li Bin <huawei.libin@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Will Deacon <will.deacon@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Punit Agrawal <punit.agrawal@....com>,
	Mark Rutland <mark.rutland@....com>, zhouchengming1@...wei.com,
	xiexiuqi@...wei.com, dingtianhong@...wei.com,
	linux-kernel@...r.kernel.org, guohanjun@...wei.com
Subject: Re: [PATCH] arm64: ftrace: function_graph: dump real return addr in call trace

On Thursday 15 October 2015 20:12:35 Li Bin wrote:
> 
> +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
> +static void print_ftrace_graph_addr(unsigned long addr,
> +                                       struct task_struct *tsk,
> +                                       unsigned long sp, int *graph)
> +{
> +       unsigned long ret_addr;
> +       int index = tsk->curr_ret_stack;
> +
> +       if (addr != ((unsigned long)return_to_handler - 4))
> +               return;
> +
> +       if (!tsk->ret_stack || index < *graph)
> 

I think it would be nicer to remove the #ifdef and write this as

static void print_ftrace_graph_addr(unsigned long addr,
                                    struct task_struct *tsk,
                                    unsigned long sp, int *graph)
{
       unsigned long ret_addr;
       int index = tsk->curr_ret_stack;

       if (!IS_ENABLED(CONFIG_FUNCTION_GRAPH_TRACER))
		return;

       if (addr != ((unsigned long)return_to_handler - 4))
               return;

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