linux-kernel - Re: [PATCH 4/5] x86: efi: add basic error handling

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Date:	Thu, 5 Jan 2012 09:52:14 -0800
From:	Olof Johansson <olof@...om.net>
To:	Matt Fleming <matt.fleming@...el.com>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Subject: Re: [PATCH 4/5] x86: efi: add basic error handling

On Thu, Jan 5, 2012 at 3:21 AM, Matt Fleming <matt.fleming@...el.com> wrote:
> On Tue, 2012-01-03 at 09:11 -0800, Olof Johansson wrote:
>> It's not perfect, but way better than before. Mark efi_enabled as false in
>> case of error and at least stop dereferencing pointers that are known to
>> be invalid.
>>
>> The only significant missing piece is the lack of undoing the
>> memblock_reserve of the memory that efi marks as in use. On the other
>> hand, it's not a large amount of memory, and leaving it unavailable for
>> system use should be the safer choice anyway.
>>
>> Signed-off-by: Olof Johansson <olof@...om.net>
>> ---
>>  arch/x86/platform/efi/efi.c |   89 ++++++++++++++++++++++++++++--------------
>>  1 files changed, 59 insertions(+), 30 deletions(-)
>
> Seems straight forward and better than what was there previously. Have
> you tested this error handling?

Not much, since the systems I have won't boot if there's an error
(even if graceful) and I didn't have a console with earlyprintk
support until yesterday. I'll beat on it a bit this afternoon but it
should be OK as it is.

Thanks,


-Olof
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