Re: [PATCH v7] SATA: OCTEON: support SATA on OCTEON platform

[Zubair Lutfullah Kakakhel]

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