[PATCH] powerpc: Enable kernel XZ compression option on 44x

[PATCH] powerpc: Enable kernel XZ compression option on 44x

[Christian Lamparter]

Enable kernel XZ compression option on 44x.
Tested on a Western Digital - MyBook Live NAS.
It takes 22 seconds for the 800 MHz CPU to decompress
and boot a 2.63 MiB XZ-compressed kernel simpleImage.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
---
 arch/powerpc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2890d36eb531..58b6ad3555e0 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -201,7 +201,7 @@ config PPC
 	select HAVE_IOREMAP_PROT
 	select HAVE_IRQ_EXIT_ON_IRQ_STACK
 	select HAVE_KERNEL_GZIP
-	select HAVE_KERNEL_XZ			if PPC_BOOK3S
+	select HAVE_KERNEL_XZ			if PPC_BOOK3S || 44x
 	select HAVE_KPROBES
 	select HAVE_KPROBES_ON_FTRACE
 	select HAVE_KRETPROBES
-- 
2.20.1

Re: powerpc: Enable kernel XZ compression option on 44x

[Michael Ellerman]

On Thu, 2019-01-31 at 20:59:04 UTC, Christian Lamparter wrote:
> Enable kernel XZ compression option on 44x.
> Tested on a Western Digital - MyBook Live NAS.
> It takes 22 seconds for the 800 MHz CPU to decompress
> and boot a 2.63 MiB XZ-compressed kernel simpleImage.
> 
> Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/423bfc69d7f491c47fc35921f7d460be

cheers

Re: powerpc: Enable kernel XZ compression option on 44x

[Christian Lamparter]

On Friday, February 8, 2019 2:02:41 PM CET Michael Ellerman wrote:
> On Thu, 2019-01-31 at 20:59:04 UTC, Christian Lamparter wrote:
> > Enable kernel XZ compression option on 44x.
> > Tested on a Western Digital - MyBook Live NAS.
> > It takes 22 seconds for the 800 MHz CPU to decompress
> > and boot a 2.63 MiB XZ-compressed kernel simpleImage.
> > 
> > Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
> 
> Applied to powerpc next, thanks.
> 
> https://git.kernel.org/powerpc/c/423bfc69d7f491c47fc35921f7d460be
> 
> cheers
> 

Hello,

I'm happy to report that a xz compressed kernel (as simpleImage)
also booted on a TP-Link WDR4900-v1 (Freescale P1014):
<https://github.com/openwrt/openwrt/pull/1773#issuecomment-461082045>

Hence, I'm inclined to also add PPC_85xx to list in /arch/powerpc/KConfig

|select HAVE_KERNEL_XZ			if PPC_BOOK3S || 44x || PPC_85xx

But on the other hand, it could very well be that more or all? PPC
would benifit from having HAVE_KERNEL_XZ available. What do you think?
(If you know of any interesting ARCHs, I could ask around too.)

Regards,
Christian