linux-kernel - Re: [EDAC ABI v13 04/25] events/hw_event: Create a Hardware Events Report Mecanism (HERM)

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Date:	Wed, 09 May 2012 10:19:18 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Borislav Petkov <bp@...64.org>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Doug Thompson <norsk5@...oo.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Tony Luck <tony.luck@...el.com>
Subject: Re: [EDAC ABI v13 04/25] events/hw_event: Create a Hardware Events
 Report Mecanism (HERM)

On Wed, 2012-05-09 at 10:51 -0300, Mauro Carvalho Chehab wrote:
> Em 09-05-2012 10:22, Borislav Petkov escreveu:
> > + Tony.
> 
> C/C Steven.

Hehe, I was already Cc'd ;-)

> One other option would be to call it as "include/trace/events/ras.h".
> 
> Steven,
> 
> Would it be possible/recommendable to move this trace header
> to include/linux/ras/hw_event.h?

Yeah, it's not hard. In fact, it's documented in
samples/trace_events/trace-events-sample.h:

/*
 * There are several ways I could have done this. If I left out the
 * TRACE_INCLUDE_PATH, then it would default to the kernel source
 * include/trace/events directory.
 *
 * I could specify a path from the define_trace.h file back to this
 * file.
 *
 * #define TRACE_INCLUDE_PATH ../../samples/trace_events
 *
 * But the safest and easiest way to simply make it use the directory
 * that the file is in is to add in the Makefile:
 *
 * CFLAGS_trace-events-sample.o := -I$(src)
 *
 * This will make sure the current path is part of the include
 * structure for our file so that define_trace.h can find it.
 *
 * I could have made only the top level directory the include:
 *
 * CFLAGS_trace-events-sample.o := -I$(PWD)
 *
 * And then let the path to this directory be the TRACE_INCLUDE_PATH:
 *
 * #define TRACE_INCLUDE_PATH samples/trace_events
 *
 * But then if something defines "samples" or "trace_events" as a macro
 * then we could risk that being converted too, and give us an unexpected
 * result.
 */

But usually the header would go where the code is:

drivers/edac/hw_event.h

Or rename it. The XFS tracepoints do this:

fs/xfs/xfs_trace.h

-- Steve

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