linux-kernel - Re: [PATCH] x86,efi: Implement efi_no_storage

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Message-ID: <alpine.LRH.2.00.1304170116060.8789@twin.jikos.cz>
Date:	Wed, 17 Apr 2013 01:16:35 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Richard Weinberger <richard@....at>
Cc:	matt.fleming@...el.com, cbouatmailru@...il.com, ccross@...roid.com,
	keescook@...omium.org, tony.luck@...el.com,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	matthew.garrett@...ula.com
Subject: Re: [PATCH] x86,efi: Implement efi_no_storage_paranoia parameter

On Wed, 17 Apr 2013, Richard Weinberger wrote:

> Using this parameter one can disable the storage_size/2 check if
> he is really sure that the UEFI does sane gc and fulfills the spec.
> 
> This parameter is useful if a devices uses more than 50% of the
> storage by default.
> The Intel DQSW67 desktop board is such a sucker for exmaple.
> 
> Signed-off-by: Richard Weinberger <richard@....at>
> ---
>  Documentation/kernel-parameters.txt |  6 ++++++
>  arch/x86/platform/efi/efi.c         | 15 ++++++++++++++-
>  2 files changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 4609e81..d1cc3a9 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -788,6 +788,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
>  	edd=		[EDD]
>  			Format: {"off" | "on" | "skip[mbr]"}
>  
> +	efi_no_storage_paranoia [EFI; X86]
> +			Using this parameter you can use more than 50% of
> +			your efi variable storage. Use this parameter only if
> +			you are really sure that your UEFI does sane gc and
> +			fulfills the spec otherwise your board may brick.
> +
>  	eisa_irq_edge=	[PARISC,HW]
>  			See header of drivers/parisc/eisa.c.
>  
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index 4959e3f..07524e1 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -113,6 +113,16 @@ static int __init setup_add_efi_memmap(char *arg)
>  }
>  early_param("add_efi_memmap", setup_add_efi_memmap);
>  
> +static bool efi_no_storage_paranoia;
> +EXPORT_SYMBOL_GPL(efi_no_storage_paranoia);

Is there any particular reason to export this symbol?

-- 
Jiri Kosina
SUSE Labs

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