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

[Michael Tretter]

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...

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;
> >  }
> >