fec_mpc52xx: write in C...

If you need to find a difference between addresses of two
struct members, subtract offsetof() or cast addresses to
char * and subtract those if you prefer it that way.  Doing
that same with s/char */u32/, OTOH...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

diff --git a/drivers/net/fec_mpc52xx.c b/drivers/net/fec_mpc52xx.c
index 79f7ead..f91ee70 100644 (file)
--- a/drivers/net/fec_mpc52xx.c
+++ b/drivers/net/fec_mpc52xx.c
@@ -568,8 +568,9 @@ static void mpc52xx_fec_reset_stats(struct net_device *dev)
        struct mpc52xx_fec __iomem *fec = priv->fec;
 
        out_be32(&fec->mib_control, FEC_MIB_DISABLE);
-       memset_io(&fec->rmon_t_drop, 0, (__force u32)&fec->reserved10 -
-                       (__force u32)&fec->rmon_t_drop);
+       memset_io(&fec->rmon_t_drop, 0,
+                  offsetof(struct mpc52xx_fec, reserved10) -
+                  offsetof(struct mpc52xx_fec, rmon_t_drop));
        out_be32(&fec->mib_control, 0);
 
        memset(&dev->stats, 0, sizeof(dev->stats));