[PATCH 3/3] net: macb: fix compiler warning for 64 bit systems

[Ahmad Fatoum]

Hi,

On 10/15/20 4:04 PM, Michael Tretter wrote:
> On Thu, 15 Oct 2020 15:29:01 +0200, Ahmad Fatoum wrote:
>> On 10/15/20 3:20 PM, Michael Tretter wrote:
>>> On arm64 the compiler prints the following warning, when the macb driver
>>> is enabled:
>>>
>>> 	warning: cast from pointer to integer of different size
>>>
>>> Add the same explicit cast as implemented for all other dma addresses in
>>> the macb driver.
>>>
>>> Fixes: befd110b5922 ("net: macb: init multiple dummy TX queues")
>>
>> I don't think this qualifies as a fix. You just silence the compiler
>> warning you that your truncate the upper 32 bits of your buffer's
>> address. This works because your SDRAM's location in physical memory
>> is below 4G.
> 
> Correct. Which is exactly the same as assumed by the entire driver...

Ye, I am commenting on your Fixes: line though :-)

> 
> Michael
> 
>>
>>> Signed-off-by: Michael Tretter <m.tretter at pengutronix.de>
>>> ---
>>>  drivers/net/macb.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/macb.c b/drivers/net/macb.c
>>> index fa530cfe8e4c..188dbf2d8c15 100644
>>> --- a/drivers/net/macb.c
>>> +++ b/drivers/net/macb.c
>>> @@ -365,7 +365,7 @@ static int gmac_init_dummy_tx_queues(struct macb_device *macb)
>>>  		MACB_BIT(TX_LAST) | MACB_BIT(TX_USED);
>>>  
>>>  	for (i = 1; i < num_queues; i++)
>>> -		gem_writel_queue_TBQP(macb, &macb->gem_q1_descs[0], i - 1);
>>> +		gem_writel_queue_TBQP(macb, (ulong)macb->gem_q1_descs, i - 1);
>>>  
>>>  	return 0;
>>>  }
>>>
> 

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