linux-kernel - Re: [PATCH v4 06/12] efi: export efi runtime memory mapping to sysfs

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Date:	Mon, 2 Dec 2013 10:59:42 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.infradead.org, greg@...ah.com, matt@...sole-pimps.org,
	toshi.kani@...com
Subject: Re: [PATCH v4 06/12] efi: export efi runtime memory mapping to sysfs

On 11/29/13 at 12:50pm, Borislav Petkov wrote:
> No need for the list - I actually meant you simply use a tmp pointer for
> each krealloc invocation - just look around the tree for examples.
> 
> Also think about what happens to the pointed-to memory when krealloc
> returns NULL.

Ok, thanks for the explaination.

> 
> > suppose kexec runtime map preparing fails we still can get 1st kernel
> > boot ok.
> 
> Yeah, nothing stops that - especially if you iterate over the mapped
> regions a second time separately, for kexec.
> 
> Which reminds me, all that save_runtime_map code needs to be behind
> CONFIG_KEXEC. We don't want to be doing this if KEXEC is not enabled.

They are only called if there's setup_data SETUP_EFI passed in. Yes, I think
only kexec need that part of code. But I hesitated to mess the code with
a lot of #if. Will think about it.

Thanks
Dave
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