linux-kernel - Re: [PATCH] irqchip/gic-v3: Remove the unused register definition

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Message-ID: <4d1319ffb0631f59bc5355b409331c42@kernel.org>
Date:   Tue, 30 Jun 2020 17:18:52 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     linux-kernel@...r.kernel.org, wanghaibin.wang@...wei.com
Subject: Re: [PATCH] irqchip/gic-v3: Remove the unused register definition

On 2020-06-30 14:41, Zenghui Yu wrote:
> As per the GICv3 specification, GIC{D,R}_SEIR are not assigned and the
> locations (0x0068) are actually Reserved. GICR_MOV{LPI,ALL}R are two 
> IMP
> DEF registers and might be defined by some specific micro-architecture,
> Linux doesn't use them.
> 
> As they're not used anywhere in the kernel, just drop all of them.
> 
> Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>

To be clear, those were actually present in the spec back in the days
(in the 2013 time frame). It just shows how the architecture evolved...

I'll queue this for 5.9.

Thanks,

         M.

> ---
> 
> Compile tested on top of mainline.
> 
>  include/linux/irqchip/arm-gic-v3.h | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/include/linux/irqchip/arm-gic-v3.h
> b/include/linux/irqchip/arm-gic-v3.h
> index 6c36b6cc3edf..f6d092fdb93d 100644
> --- a/include/linux/irqchip/arm-gic-v3.h
> +++ b/include/linux/irqchip/arm-gic-v3.h
> @@ -19,7 +19,6 @@
>  #define GICD_CLRSPI_NSR			0x0048
>  #define GICD_SETSPI_SR			0x0050
>  #define GICD_CLRSPI_SR			0x0058
> -#define GICD_SEIR			0x0068
>  #define GICD_IGROUPR			0x0080
>  #define GICD_ISENABLER			0x0100
>  #define GICD_ICENABLER			0x0180
> @@ -119,14 +118,11 @@
>  #define GICR_WAKER			0x0014
>  #define GICR_SETLPIR			0x0040
>  #define GICR_CLRLPIR			0x0048
> -#define GICR_SEIR			GICD_SEIR
>  #define GICR_PROPBASER			0x0070
>  #define GICR_PENDBASER			0x0078
>  #define GICR_INVLPIR			0x00A0
>  #define GICR_INVALLR			0x00B0
>  #define GICR_SYNCR			0x00C0
> -#define GICR_MOVLPIR			0x0100
> -#define GICR_MOVALLR			0x0110
>  #define GICR_IDREGS			GICD_IDREGS
>  #define GICR_PIDR2			GICD_PIDR2

-- 
Jazz is not dead. It just smells funny...