linux-kernel - Re: [PATCH 0/3] Early use of boot service memory

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Message-ID: <CAOJsxLEU1SPd=1C8QPgrZGWeOuyOVkozuMR014xBpJTxyFviKA@mail.gmail.com>
Date:	Tue, 12 Nov 2013 20:48:51 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Jerry Hoemann <jerry.hoemann@...com>
Cc:	Rob Landley <rob@...dley.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86 maintainers <x86@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"list@...ederm.org:DOCUMENTATION <linux-doc@...r.kernel.org>,
	list@...ederm.org:MEMORY MANAGEMENT <linux-mm@...ck.org>," 
	<linux-doc@...r.kernel.org>, linux-efi@...r.kernel.org,
	Vivek Goyal <vgoyal@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Early use of boot service memory

Hi Jerry,

On Tue, Nov 12, 2013 at 7:55 PM,  <jerry.hoemann@...com> wrote:
> My change does not address platforms that have misbehaving firmware.
> It just allows platforms that don't have this issue to avoid issues
> that the call to efi_reserve_boot_services presents.

The problem I have with your patch is that it (1) relies on users to
pass a kernel option and (2) leaves machines with "faulty firmware" out
in the cold.  So I'm wondering if we can fix reserve_crashkernel() to
deal with reality that there indeed are broken firmware out there?

If someone is able to come up with a convincing argument why crashkernel
cannot be fixed on such machines, we'd need to start whitelisting known
good firmwares, no?

                           Pekka
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