linux-kernel - Re: [PATCH] tracing: always define trace_{irq,preempt}_{enable

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Date:   Tue, 31 Oct 2017 10:13:41 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Ingo Molnar <mingo@...hat.com>, Joel Fernandes <joelaf@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: always define
 trace_{irq,preempt}_{enable_disable}

On Thu, 19 Oct 2017 10:32:13 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> We get a build error in the irqsoff tracer in some configurations:
> 
> 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'; did you mean 'trace_irq_enable_rcuidle'? [-Werror=implicit-function-declaration]
>   trace_preempt_enable_rcuidle(a0, a1);
> 
> The problem is that trace_preempt_enable_rcuidle() has different
> definition based on multiple Kconfig symbols, but not all combinations
> have a valid definition.
> 
> This changes the conditions so that we always get exactly one
> definition of each of the four tracing macros. I have not tried
> to verify that these definitions are sensible, but now we
> can build all randconfig combinations again.
> 
> Fixes: d59158162e03 ("tracing: Add support for preempt and irq enable/disable events")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied. Thanks Arnd.

-- Steve