linux-kernel - Re: RAS trace event proto

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Date:	Wed, 22 Feb 2012 09:26:34 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Borislav Petkov <bp@...64.org>, "Luck, Tony" <tony.luck@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	edac-devel <linux-edac@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: RAS trace event proto

On Wed, 2012-02-22 at 11:32 -0200, Mauro Carvalho Chehab wrote:

> @Steven:
> 
> In a matter of fact, the error_severity and error_type should be enum's. We should not
> use enum's on ioctl's, as enum size is not portable. Can it be used inside perf, or should
> them be exported, on perf, via integer (like the above proposal)?

I don't know exactly how perf does it today, but I'm sure it's similar
to trace-cmd.

You can use an enum, as it just comes through as a number. Each field is
given the size of that field. If it's an int it stays an int.

Note though, perf and trace-cmd do not know how to convert the number
back to a enum name. You can use the __print_symbols() feature, but
that's about it.

-- Steve

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