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Subject: Re: [PATCH v5 08/11] powerpc/powernv: Add platform support for stop
 instruction
From: Benjamin Herrenschmidt <benh@au1.ibm.com>
Reply-To: benh@au1.ibm.com
To: "Shreyas B. Prabhu" <shreyas@linux.vnet.ibm.com>, mpe@ellerman.id.au
Cc: ego@linux.vnet.ibm.com, mikey@neuling.org, maddy@linux.vnet.ibm.com,
 linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Date: Mon, 06 Jun 2016 08:28:38 +1000
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On Thu, 2016-06-02 at 07:38 -0500, Shreyas B. Prabhu wrote:
> @@ -61,8 +72,13 @@ save_sprs_to_stack:
>          * Note all register i.e per-core, per-subcore or per-thread is saved
>          * here since any thread in the core might wake up first
>          */
> +BEGIN_FTR_SECTION
> +       mfspr   r3,SPRN_PTCR
> +       std     r3,_PTCR(r1)
> +FTR_SECTION_ELSE
>         mfspr   r3,SPRN_SDR1
>         std     r3,_SDR1(r1)
> +ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)

This is the only new SPR we care about in P9 ?

Cheers,
Ben.