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SubjectRe: [PATCH V2 3/3] ethernet: Convert mac address uses of 6 to ETH_ALEN
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On Thu, 2013-08-01 at 21:33 +0100, Russell King - ARM Linux wrote:
> On Thu, Aug 01, 2013 at 01:31:09PM -0700, Olof Johansson wrote:
> > Hi,

Hi all.

> > On Thu, Aug 1, 2013 at 1:14 PM, Joe Perches <joe@perches.com> wrote:
> > > diff --git a/drivers/net/ethernet/pasemi/pasemi_mac.h b/drivers/net/ethernet/pasemi/pasemi_mac.h
[]
> > > @@ -79,11 +79,11 @@ struct pasemi_mac {
> > > int last_cs;
> > > int num_cs;
> > > u32 dma_if;
> > > - u8 type;
> > > #define MAC_TYPE_GMAC 1
> > > #define MAC_TYPE_XAUI 2
> > >
> > > - u8 mac_addr[6];
> > > + u8 mac_addr[ETH_ALEN];
> > > + u8 type;
> >
> > Just promote 'type' to u32 instead, saves you from moving the #defines
> > down, etc, etc.

type is already u8, why change it?
That would also change struct size.

> There's a more fundamental question which has to be asked: what is the
> point of moving that in the first place?

Some is_<foo>_ether_addr tests assume __aligned(2)
by a casting char * to u16/be16 * and dereferencing.

see patch 0/3 and include/linux/etherdevice.h




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