linux-kernel - Re: [PATCH] powerpc: Enable kernel XZ compression option on PPC

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Message-ID: <877e9qp3ou.fsf@dja-thinkpad.axtens.net>
Date:   Thu, 13 Jun 2019 13:25:05 +1000
From:   Daniel Axtens <dja@...ens.net>
To:     Pawel Dembicki <paweldembicki@...il.com>
Cc:     Pawel Dembicki <paweldembicki@...il.com>,
        Christian Lamparter <chunkeey@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: Enable kernel XZ compression option on PPC_85xx

Pawel Dembicki <paweldembicki@...il.com> writes:

> Enable kernel XZ compression option on PPC_85xx. Tested with
> simpleImage on TP-Link TL-WDR4900 (Freescale P1014 processor).
>
> Suggested-by: Christian Lamparter <chunkeey@...il.com>
> Signed-off-by: Pawel Dembicki <paweldembicki@...il.com>
> ---
>  arch/powerpc/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 8c1c636308c8..daf4cb968922 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -196,7 +196,7 @@ config PPC
>  	select HAVE_IOREMAP_PROT
>  	select HAVE_IRQ_EXIT_ON_IRQ_STACK
>  	select HAVE_KERNEL_GZIP
> -	select HAVE_KERNEL_XZ			if PPC_BOOK3S || 44x
> +	select HAVE_KERNEL_XZ			if PPC_BOOK3S || 44x || PPC_85xx

(I'm not super well versed in the compression stuff, so apologies if
this is a dumb question.) If it's this simple, is there any reason we
can't turn it on generally, or convert it to a blacklist of platforms
known not to work?

Regards,
Daniel

>  	select HAVE_KPROBES
>  	select HAVE_KPROBES_ON_FTRACE
>  	select HAVE_KRETPROBES
> -- 
> 2.20.1