Re: [PATCH] arm: Add support for ZSTD compressed kernel

[Russell King - ARM Linux admin]

On Thu, Aug 06, 2020 at 01:05:55AM +0200, Norbert Lange wrote:
> diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
> index 434a16982e34..1af01bfe6638 100644
> --- a/arch/arm/boot/compressed/head.S
> +++ b/arch/arm/boot/compressed/head.S
> @@ -614,7 +614,11 @@ not_relocated:	mov	r0, #0
>   */
>  		mov	r0, r4
>  		mov	r1, sp			@ malloc space above stack
> +#if defined(CONFIG_KERNEL_ZSTD)
> +		add	r2, sp, #0x30000	@ Context needs ~160K

That's going to mess up kexec:

        /*
         * The zImage length does not include its stack (4k) or its
         * malloc space (64k).  Include this.
         */
        len += 0x11000;

I guess we need to add this to the information provided to kexec.

-- 
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