linux-kernel - RE: [PATCH v2] efi-pstore: Make efi-pstore return a unique id

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Date:	Wed, 27 Nov 2013 14:51:22 +0000
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Matt Fleming <matt@...sole-pimps.org>, Madper Xie <cxie@...hat.com>
CC:	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"matt.fleming@...el.com" <matt.fleming@...el.com>,
	"richard@....at" <richard@....at>, Tony Luck <tony.luck@...il.com>
Subject: RE: [PATCH v2] efi-pstore: Make efi-pstore return a unique id



> -----Original Message-----
> From: Matt Fleming [mailto:matt@...sole-pimps.org]
> Sent: Wednesday, November 27, 2013 6:45 AM
> To: Madper Xie
> Cc: 'linux-kernel@...r.kernel.org'; linux-efi@...r.kernel.org; matt.fleming@...el.com; Seiji Aguchi; richard@....at; Tony Luck
> Subject: Re: [PATCH v2] efi-pstore: Make efi-pstore return a unique id
> 
> On Sat, 23 Nov, at 07:55:37PM, Madper Xie wrote:
> >
> > Pstore fs expects that backends provide a uniqued id which could avoid
> > pstore making entries as duplication or denominating entries the same
> > name. So I combine the timestamp, part and count into id.
> >
> > Signed-off-by: Madper Xie <cxie@...hat.com>
> > ---
> >  drivers/firmware/efi/efi-pstore.c | 19 +++++++++++++------
> >  1 file changed, 13 insertions(+), 6 deletions(-)
> 
> Thanks unless anyone complains, I'm going to apply this.
> 

I'm OK with this patch based on Madper's comment below.

<snip>
So i'd like to using fixed length. My dell xps has 128kb nvram
space. and it at most store 126 pstore entries. So I think 1000 will be
a safe value for count. For part, 100 should be okay. I don't think
there will be a large kmsg and we must split it into more than 100 parts.
<snip>

> Does this need to be tagged for stable?
> 

I think so.

Seiji

> --
> Matt Fleming, Intel Open Source Technology Center
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