linux-kernel - Re: kernel//trace/trace_irqsoff.c:855:2: error: implicit declaration of function 'trace_preempt_enable

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Date:   Thu, 30 Nov 2017 19:10:36 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     kbuild test robot <fengguang.wu@...el.com>
Cc:     Joel Fernandes <joelaf@...gle.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: kernel//trace/trace_irqsoff.c:855:2: error: implicit
 declaration of function 'trace_preempt_enable_rcuidle'

On Tue, 28 Nov 2017 13:56:45 +0800
kbuild test robot <fengguang.wu@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   4fbd8d194f06c8a3fd2af1ce560ddb31f7ec8323
> commit: d59158162e032917a428704160a2063a02405ec6 tracing: Add support for preempt and irq enable/disable events

Thanks Fengguang,

I have a patch in my local tree from Arnd that I forgot to push up to
Linus. I'm adding some more fixes to my tree, and then I need to test
them and then this will get fixed.

-- Steve

> date:   7 weeks ago
> config: x86_64-randconfig-s0-11281312 (attached as .config)
> compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
> reproduce:
>         git checkout d59158162e032917a428704160a2063a02405ec6
>         # save the attached .config to linux build tree
>         make ARCH=x86_64 
> 
> All errors (new ones prefixed by >>):
> 
>    kernel//trace/trace_irqsoff.c: In function 'trace_preempt_on':
> >> kernel//trace/trace_irqsoff.c:855:2: error: implicit declaration of function 'trace_preempt_enable_rcuidle' [-Werror=implicit-function-declaration]  
>      trace_preempt_enable_rcuidle(a0, a1);
>      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    kernel//trace/trace_irqsoff.c: In function 'trace_preempt_off':
> >> kernel//trace/trace_irqsoff.c:861:2: error: implicit declaration of function 'trace_preempt_disable_rcuidle' [-Werror=implicit-function-declaration]  
>      trace_preempt_disable_rcuidle(a0, a1);
>      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors
> 
> vim +/trace_preempt_enable_rcuidle +855 kernel//trace/trace_irqsoff.c
> 
>    850	
>    851	#if defined(CONFIG_PREEMPT_TRACER) || \
>    852		(defined(CONFIG_DEBUG_PREEMPT) && defined(CONFIG_PREEMPTIRQ_EVENTS))
>    853	void trace_preempt_on(unsigned long a0, unsigned long a1)
>    854	{
>  > 855		trace_preempt_enable_rcuidle(a0, a1);  
>    856		tracer_preempt_on(a0, a1);
>    857	}
>    858	
>    859	void trace_preempt_off(unsigned long a0, unsigned long a1)
>    860	{
>  > 861		trace_preempt_disable_rcuidle(a0, a1);  
> 
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation