linux-kernel - Re: [PATCH 2/4] x86/pvops: target CREATE_TRACE

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Date:	Fri, 17 Apr 2009 10:14:47 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	mathieu.desnoyers@...ymtl.ca, Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 2/4] x86/pvops: target CREATE_TRACE_POINTS to particular
 subsystems

Steven Rostedt wrote:
> On Fri, 17 Apr 2009, Jeremy Fitzhardinge wrote:
>
>   
>> Steven Rostedt wrote:
>>     
>>> Ah yes! It needs to be:
>>>
>>> #ifdef CONFIG_IRQ_TRACE_POINTS
>>> #undef CONFIG_IRQ_TRACE_POINTS
>>> #include <trace/define_trace.h>
>>> #endif
>>>
>>> Otherwise we get into the recursion again.
>>>   
>>>       
>> We should probably also move the #define TRACE_SYS in there as well (without
>> the #undef), as it should only have one definition at a time...
>>     
>
> Actually, I'm kind of against that. Just because as it stands, the 
> TRACE_SYSTEM macro is up at the top, and it is easy to see.
>   

Yes, but it means that if you're in the middle of 
CREATE_FOO_TRACE_POINTS and foo.h happens to include bar.h, suddenly 
TRACE_SUBSYSTEM becomes bar...

> Actually, we could do (from the top of the file)
>
> #ifdef CONFIG_IRQ_TRACE_POINTS
> #undef CONFIG_IRQ_TRACE_POINTS
>
> #define TRACE_SYSTEM irq
>
> #include <trace/define_trace.h>
>
> #elif !defined(_TRACE_IRQ_H) || defined(TRACE_HEADER_MULTI_READ)
> #define _TRACE_IRQ_H
>
> #include <linux/tracepoint.h>
> #include <linux/interrupt.h>
>
>
> [...]
>
> #endif
>   

That's slightly different from what we have now.  At the moment its

    #if !defined(_TRACE_IRQ_H)...
    ...
    #endif

    #ifdef CREATE_IRQ_TRACE_POINTS
    ...
    #endif

So we get both the main part of the file and the CREATE_X_TRACE_POINTS 
parts.  Your suggestion makes them exclusive:

    #ifdef CREATE_IRQ_TRACE_POINTS
    ...
    #elif !defined(_TRACE_IRQ_H)...
    ...
    #endif
      

Does that make a difference?

    J
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