linux-kernel - Re: [PATCH 7/9] powerpc/powernv: Add platform support for stop instruction

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Date:	Tue, 03 May 2016 15:25:50 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	"Shreyas B. Prabhu" <shreyas@...ux.vnet.ibm.com>,
	mpe@...erman.id.au
Cc:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] powerpc/powernv: Add platform support for stop
 instruction


> diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
> index df4fb5f..a4739a1 100644
> --- a/arch/powerpc/include/asm/cputable.h
> +++ b/arch/powerpc/include/asm/cputable.h
> @@ -205,6 +205,7 @@ enum {
>  #define CPU_FTR_DABRX			LONG_ASM_CONST(0x0800000000000000)
>  #define CPU_FTR_PMAO_BUG		LONG_ASM_CONST(0x1000000000000000)
>  #define CPU_FTR_SUBCORE			LONG_ASM_CONST(0x2000000000000000)
> +#define CPU_FTR_STOP_INST		LONG_ASM_CONST(0x4000000000000000)

In general, we are putting all the POWER9 features under CPU_FTR_ARCH_300.
Is there a reason you need this separate bit?

CPU_FTR bits are fairly scarce these days.

Mikey