linux-kernel - Re: [RFC PATCH 05/33] irqchip/gic-v3-its: Zero command on allocation

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Message-ID: <alpine.DEB.2.20.1702131055200.3619@nanos>
Date:   Mon, 13 Feb 2017 10:55:50 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Marc Zyngier <marc.zyngier@....com>
cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [RFC PATCH 05/33] irqchip/gic-v3-its: Zero command on
 allocation

On Tue, 17 Jan 2017, Marc Zyngier wrote:

> When reusing commands from the ring buffer, it would be better
> to zero them out, even if the ITS should ignore the unused
> fields.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  drivers/irqchip/irq-gic-v3-its.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 2ca27f6..9304dd2 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -426,6 +426,12 @@ static struct its_cmd_block *its_allocate_entry(struct its_node *its)
>  	if (its->cmd_write == (its->cmd_base + ITS_CMD_QUEUE_NR_ENTRIES))
>  		its->cmd_write = its->cmd_base;
>  
> +	/* Clear command  */
> +	cmd->raw_cmd[0] = 0;
> +	cmd->raw_cmd[1] = 0;
> +	cmd->raw_cmd[2] = 0;
> +	cmd->raw_cmd[3] = 0;

  memset ?

Thanks,

	tglx