Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

From: Sergei Shtylyov <[email-masked]>
Date: Thu, 18 Oct 2007 18:45:48 +0400

Sergei Shtylyov wrote:
> Add PowerPC decrementer clock event driver.

> Every effort has been made to support the different implementations of the
> decrementer: the classic one (with 970 series variation), 40x and Book E
> specific ones.

> I had to make CONFIG_GENERIC_CLOCKEVENTS option selectable for the
> compatibility reasons -- this option is not compatible with the PPC64
> deterministic time accounting.

> Thanks to Daniel Walker and Thomas Gleixner for the suggestions they made...

> Signed-off-by: Sergei Shtylyov <[email-masked]>

> Index: linux-2.6/arch/powerpc/Kconfig
> ===================================================================
> --- linux-2.6.orig/arch/powerpc/Kconfig
> +++ linux-2.6/arch/powerpc/Kconfig
> @@ -317,7 +317,7 @@ config PPC_STD_MMU_32
>  
>  config VIRT_CPU_ACCOUNTING
>  	bool "Deterministic task and CPU time accounting"
> -	depends on PPC64
> +	depends on PPC64 && !GENERIC_CLOCKEVENTS
>  	default y
>  	help
>  	  Select this option to enable more accurate task and CPU time

    Thomas, that part of the ppc-clockevents.patch (part of the -rt patch) is 
now broken, it makes CONFIG_MAX_ZONEORDER dependent on 
!CONFIG_GENERIC_CLOCKEVENTS -- this is probably due to patch's fuzzy logic.
Do I need to send a patch to fix this?

WBR, Sergei