linux-kernel - Re: [PATCH V3] AHCI: Workaround for ThunderX Errata#22536

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Date:	Wed, 17 Feb 2016 17:12:04 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	tchalamarla@...iumnetworks.com
cc:	tj@...nel.org, stripathi@....com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V3] AHCI: Workaround for ThunderX Errata#22536

On Tue, 16 Feb 2016, tchalamarla@...iumnetworks.com wrote:
> +#ifdef CONFIG_ARM64
> +/* Due to ERRATA#22536, ThunderX need to handle
> + * HOST_IRQ_STAT differently.
> + * Work around is to make sure all pending IRQs
> + * are served before leaving handler
> + */
> +static irqreturn_t ahci_thunderx_irq_handler(int irq, void *dev_instance)
> +{
> +	struct ata_host *host = dev_instance;
> +	struct ahci_host_priv *hpriv;
> +	unsigned int rc = 0;
> +	void __iomem *mmio;
> +	u32 irq_stat, irq_masked;
> +	unsigned int handled = 1;
> +
> +	VPRINTK("ENTER\n");

Come on. This VPRINK stuff is really pointless. Enable irq tracepoints, they
already track the enter/exit of interrupt handlers ....

Thanks,

	tglx