linux-kernel - Re: [PATCHv3] x86: EFI stub support for large memory maps

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Message-ID: <20130927234607.GA17867@oranje.fc.hp.com>
Date:	Fri, 27 Sep 2013 17:46:07 -0600
From:	Linn Crosetto <linn@...com>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	matt.fleming@...el.com, hpa@...or.com, tglx@...utronix.de,
	mingo@...hat.com, x86@...nel.org, yinghai@...nel.org,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3] x86: EFI stub support for large memory maps

On Thu, Sep 26, 2013 at 12:34:00PM +0100, Matt Fleming wrote:
> > I might add the following to your merge for semantic reasons:
> > 
> > diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
> > index 04b228d..a7677ba 100644
> > --- a/arch/x86/boot/compressed/eboot.c
> > +++ b/arch/x86/boot/compressed/eboot.c
> > @@ -730,6 +730,8 @@ get_map:
> >         boot_params->alt_mem_k = 32 * 1024;
> >  
> >         status = setup_e820(boot_params, e820ext, e820ext_size);
> > +       if (status != EFI_SUCCESS)
> > +               return status;
> >  
> >         return EFI_SUCCESS;
> 
> Aha, nice catch! Though if setup_e820() fails we should be jumping to
> the 'free_mem_map' label so we don't leak the memory map, like so,
> 
> diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
> index 04b228d..602950b 100644
> --- a/arch/x86/boot/compressed/eboot.c
> +++ b/arch/x86/boot/compressed/eboot.c
> @@ -730,8 +730,8 @@ get_map:
>  	boot_params->alt_mem_k = 32 * 1024;
>  
>  	status = setup_e820(boot_params, e820ext, e820ext_size);
> -
> -	return EFI_SUCCESS;
> +	if (status == EFI_SUCCESS)
> +		return status;
>  
>  free_mem_map:
>  	efi_call_phys1(sys_table->boottime->free_pool, mem_map);

Given that we have already successfully called exit_boot_services, can we still
make this call to free_pool?
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