linux-kernel - Re: [PATCH v7] SATA: OCTEON: support SATA on OCTEON platform

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Message-ID: <56B376CE.9010600@imgtec.com>
Date:	Thu, 4 Feb 2016 16:05:34 +0000
From:	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>
To:	Aleksey Makarov <aleksey.makarov@...iumnetworks.com>,
	<tj@...nel.org>, <hdegoede@...hat.com>
CC:	<david.daney@...ium.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>
Subject: Re: [PATCH v7] SATA: OCTEON: support SATA on OCTEON platform

Hi,

Thank-you for the review.

On 04/02/16 12:24, Aleksey Makarov wrote:
>
> Hi Zubair,
>
>> +	void __iomem *base;
>
> [..]
>
>> +	cfg = cvmx_read_csr((uint64_t)base + CVMX_SATA_UCTL_SHIM_CFG);
>
> sparse will complain here.  See Documentation/sparse.txt

Yes. sparse says

...
CHECK   drivers/ata/sata_octeon.c
drivers/ata/sata_octeon.c:50:30: warning: cast removes address space of expression
drivers/ata/sata_octeon.c:65:25: warning: cast removes address space of expression
...

Use of (__force uint64_t) removes the sparse warning. But it was
frowned upon by arnd.

He suggested a wrapper helper in asm/octeon/cvmx.h which handles iomem
addresses and __force behind the scenes rather than in the driver.

static inline void cvmx_write_csr_resource(void __iomem *csr_addr, uint64_t val)
{
	cvmx_write_csr((__force uint64_t)csr_addr, val)
}

Alternatives? Or should I resend with the above wrapper?

Regards,
ZubairLK

>
> Thank you
> Aleksey Makarov
>