Re: [PATCH net-next 03/32] sfc: Remove parentheses around return expressions, reported by checkpatch

[Ben Hutchings <bhutchings@solarflare.com>]

On Fri, 2012-01-27 at 13:01 -0800, Joe Perches wrote:
> On Fri, 2012-01-27 at 20:42 +0000, Ben Hutchings wrote:
> > Fix the following error:
> > ERROR: return is not a function, parentheses are not required
> > Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
> 
> trivia:
> 
> > diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
> []
> > @@ -98,8 +98,8 @@ static inline unsigned int efx_rx_buf_offset(struct efx_nic *efx,
> >  	/* Offset is always within one page, so we don't need to consider
> >  	 * the page order.
> >  	 */
> > -	return (((__force unsigned long) buf->dma_addr & (PAGE_SIZE - 1)) +
> > -		efx->type->rx_buffer_hash_size);
> > +	return ((__force unsigned long) buf->dma_addr & (PAGE_SIZE - 1)) +
> > +		efx->type->rx_buffer_hash_size;
> >  }
> 
> The function returns unsigned int, perhaps the
> cast should be (__force unsigned int) or the
> function should return unsigned long or maybe
> size_t?

It's a page offset, so I believe unsigned int is correct.  This function
used to use the virtual address, and the compiler will warn about
casting a pointer to an integer of smaller size.  Now that it's using
the DMA address, this no longer applies (and __force is not necessary
either).

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
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