linux-kernel - RE: [RFC][PATCH v2 2/3] Hold multiple logs

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Date:	Tue, 24 Jul 2012 21:12:25 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Matthew Garrett <mjg@...hat.com>
CC:	Seiji Aguchi <seiji.aguchi@....com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mikew@...gle.com" <mikew@...gle.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>,
	"dzickus@...hat.com" <dzickus@...hat.com>
Subject: RE: [RFC][PATCH v2 2/3] Hold multiple logs

> I think we inevitably lose in that scenario. I'd need to verify, but my 
> recollection is that overwriting existing variables may be equivalent to 
> a delete/create cycle.

This would mean that EFI really wants the OS to treat EFI variables as pretty much
exclusively read-only.  Any activity which periodically updates a variable would
eventually run into problems in an EFI implementation that loses the old space
until a reset.

Sad.

-Tony
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