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

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Date:	Thu, 25 Feb 2016 12:31:53 -0800
From:	Tirumalesh Chalamarla <tchalamarla@...iumnetworks.com>
To:	Thomas Gleixner <tglx@...utronix.de>
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 02/17/2016 08:12 AM, Thomas Gleixner wrote:
> 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 ....
>

sure. waiting for some more comments if any.
> Thanks,
>
> 	tglx
>
>