linux-kernel - Re: [PATCH 5/7 v7] trace, RAS: Add eMCA trace event interface

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Date:	Wed, 11 Jun 2014 22:42:52 -0400
From:	"Chen, Gong" <gong.chen@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	tony.luck@...el.com, m.chehab@...sung.com, rostedt@...dmis.org,
	linux-acpi@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7 v7] trace, RAS: Add eMCA trace event interface

On Wed, Jun 11, 2014 at 09:02:15PM +0200, Borislav Petkov wrote:
> > +EXPORT_SYMBOL_GPL(cper_mem_err_pack);
> 
> Why do we export this one and the one below? What .config warrants this?
> 
> CONFIG_ACPI_EXTLOG=m doesn't need them, AFAICT.
> 
Right. acpi_extlog doesn't use it. They can be exported later until needed.

> > +	TP_STRUCT__entry(
> > +		__field(u32, err_seq)
> > +		__field(u8, etype)
> > +		__field(u8, sev)
> > +		__field(u64, pa)
> > +		__field(u8, pa_mask_lsb)
> > +		__array(u8, fru_id, 40)
> 
> How did you come up with this magic number? Why isn't that sizeof(uuid_le)?
Cause I want to convert it into a string.

> > +		snprintf(__entry->fru_id, 39, "%pUl", fru_id);
> 
> Yeah, I didn't catch the reasoning behind why we need to convert the FRU
> into a string and not leave it simply as u8[16]...
Fair enough. It can be compressed a little bit more.


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