linux-kernel - Re: [PATCH] trace: Fix build breakage without CONFIG_PERF

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Message-ID: <20120228145744.GG1694@m.brq.redhat.com>
Date:	Tue, 28 Feb 2012 15:57:45 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] trace: Fix build breakage without CONFIG_PERF_EVENTS

On Tue, Feb 28, 2012 at 11:10:23AM +0000, Mark Brown wrote:
> Today's -next fails to build for me:
> 
>   CC      kernel/trace/trace_export.o
> In file included from kernel/trace/trace_export.c:197: kernel/trace/trace_entries.h:58: error: 'perf_ftrace_event_register' undeclared here (not in a function)
> make[2]: *** [kernel/trace/trace_export.o] Error 1
> make[1]: *** [kernel/trace] Error 2
> make: *** [kernel] Error 2
> 
> because as of ced390 (ftrace, perf: Add support to use function
> tracepoint in perf) perf_trace_event_register() is declared in trace.h
> only if CONFIG_PERF_EVENTS is enabled but I don't have that set.
> 
> Ensure that we always have a definition of perf_trace_event_register()
> by providing a definition if CONFIG_PERF_EVENTS is disabled.
> 
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> ---
> 
> This one had the build test run all the way...
> 
>  kernel/trace/trace.h |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
> index 54faec7..2aef24e 100644
> --- a/kernel/trace/trace.h
> +++ b/kernel/trace/trace.h
> @@ -842,6 +842,8 @@ int perf_ftrace_event_register(struct ftrace_event_call *call,
>  #else
>  #define perf_ftrace_event_register NULL
>  #endif /* CONFIG_FUNCTION_TRACER */
> +#else
> +#define perf_ftrace_event_register NULL
>  #endif /* CONFIG_PERF_EVENTS */
>  
>  #endif /* _LINUX_KERNEL_TRACE_H */
> -- 
> 1.7.9.1
> 

ook, this one fixies that for me as well ;) I got your replies mixed in
mailbox and thought this one was not actually working..

I also added this bit to get rid of the switch warnings,
feel free to use it.

thanks,
jirka
---
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index dd478fc..5f3f3be 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -144,12 +144,14 @@ struct event_filter;
 enum trace_reg {
 	TRACE_REG_REGISTER,
 	TRACE_REG_UNREGISTER,
+#ifdef CONFIG_PERF_EVENTS
 	TRACE_REG_PERF_REGISTER,
 	TRACE_REG_PERF_UNREGISTER,
 	TRACE_REG_PERF_OPEN,
 	TRACE_REG_PERF_CLOSE,
 	TRACE_REG_PERF_ADD,
 	TRACE_REG_PERF_DEL,
+#endif
 };
 
 struct ftrace_event_call;
--
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