linux-kernel - Re: kexec, x86/purgatory: Cleanup the unholy mess

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Date:   Fri, 10 Mar 2017 15:56:13 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Mike Galbraith <efault@....de>
cc:     Borislav Petkov <bp@...en8.de>, "Tobin C. Harding" <me@...in.cc>,
        LKML <linux-kernel@...r.kernel.org>,
        Nicholas Mc Guire <der.herr@...r.at>,
        Vivek Goyal <vgoyal@...hat.com>, x86@...nel.org
Subject: Re: kexec, x86/purgatory: Cleanup the unholy mess

On Fri, 10 Mar 2017, Mike Galbraith wrote:
> Stuffing the lot into .kexec-purgatory worked.

You beat me to it :)

And that's how that whole thing should have been done in the very beginning
instead of relying on uncomprehensible compile/link magics.

Thanks,

	tglx

> ---
>  arch/x86/purgatory/purgatory.c |   10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> --- a/arch/x86/purgatory/purgatory.c
> +++ b/arch/x86/purgatory/purgatory.c
> @@ -16,13 +16,13 @@
>  #include "sha256.h"
>  #include "../boot/string.h"
>  
> -unsigned long purgatory_backup_dest;
> -unsigned long purgatory_backup_src;
> -unsigned long purgatory_backup_sz;
> +unsigned long purgatory_backup_dest __section(.kexec-purgatory);
> +unsigned long purgatory_backup_src __section(.kexec-purgatory);
> +unsigned long purgatory_backup_sz __section(.kexec-purgatory);
>  
> -u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE];
> +u8 purgatory_sha256_digest[SHA256_DIGEST_SIZE] __section(.kexec-purgatory);
>  
> -struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX];
> +struct kexec_sha_region purgatory_sha_regions[KEXEC_SEGMENT_MAX] __section(.kexec-purgatory);
>  
>  /*
>   * On x86, second kernel requries first 640K of memory to boot. Copy
>