Re: [PATCH v3 1/7] mfd: add pruss mfd driver.

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 03/24/2011 02:16 PM, Subhasish Ghosh wrote:
> Hello,
> 
>> A device may be de-initialized and another loaded or two different
>> devices
>> can be run simultaneously on the two cores.
>> It's also possible, as in our case, to implement a single device on both
>> the PRU's resulting in improved load sharing.
> 
>> Make you driver compile with sparse "make C=1", you cast way too much
>> when accessing io mem. Use void __iomem * instead of u32 *.
> 
> 
> With make C=1 I am receiving some warnings such as:
> 
> warning: cast removes address space of expression
> drivers/mfd/da8xx_pru.c:61:17: warning: incorrect type in argument 1
> (different base types)
> drivers/mfd/da8xx_pru.c:61:17:    expected void const volatile [noderef]
> <asn:2>*<noident>
> drivers/mfd/da8xx_pru.c:61:17:    got int
> drivers/mfd/da8xx_pru.c:66:28: warning: incorrect type in argument 1
> (different address spaces)

(Re)read the warning carefully:

You have to fix drivers/mfd/da8xx_pru.c, the first argument should be
__void iomem *, not an int. Fix the type of the first argument. Don't
use any casts at all, follow all warnings, eventually you will have void
__iomem * (or struct * instead of void *) and no warnings.

> I can remove all of these by casting to (__force void  __iomem *) but is
> this correct.

No evil casts, please :)

Marc

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