linux-kernel - Re: [PATCH v29] RAS: Add a tracepoint for reporting memory controller events

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Date:	Fri, 1 Jun 2012 17:21:51 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aristeu Rozanski <arozansk@...hat.com>,
	Doug Thompson <norsk5@...oo.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v29] RAS: Add a tracepoint for reporting memory
 controller events

On Fri, Jun 01, 2012 at 12:07:38PM -0300, Mauro Carvalho Chehab wrote:
> + * Default error mechanisms for Memory Controller errors (CE and UE)
> + */
> +TRACE_EVENT(mc_event,
> +
> +	TP_PROTO(const unsigned int err_type,
> +		 const char *error_msg,
> +		 const char *label,
> +		 const int error_count,
> +		 const u8 mc_index,
> +		 const s8 layer0,
> +		 const s8 layer1,
> +		 const s8 layer2,

Btw, why are the layers still called layer[012] but differently below?
This is confusing.

Also, edac_mc_handle_error() should have the top/middle/lower layer arg
names too.

And also, why are the layers s8? Any reason for the signedness?

> +		 unsigned long address,
> +		 const int grain_bits,

This is an int here and a u8 below?

I was just about to befriend the idea of grain being u8 and accepting it
as a compromise.

Make it a u8 and cast it at the call sites of trace_mc_event instead.

> +		 unsigned long syndrome,
> +		 const char *driver_detail),
> +
> +	TP_ARGS(err_type, error_msg, label, error_count, mc_index,
> +		layer0, layer1, layer2, address, grain_bits, syndrome,
> +		driver_detail),
> +
> +	TP_STRUCT__entry(
> +		__field(	unsigned int,	error_type		)
> +		__string(	msg,		error_msg		)
> +		__string(	label,		label			)
> +		__field(	u16,		error_count		)
> +		__field(	u8,		mc_index		)
> +		__field(	s8,		top_layer		)
> +		__field(	s8,		middle_layer		)
> +		__field(	s8,		lower_layer		)
> +		__field(	long,		address			)
> +		__field(	u8,		grain_bits		)
> +		__field(	long,		syndrome		)
> +		__string(	driver_detail,	driver_detail		)
> +	),

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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