netdev - Re: [PATCH 2/4] drivers/net/ethernet/dec/tulip: Add tulip_ prefix to set_bit

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Date:	Mon, 11 Jun 2012 08:42:45 -0700
From:	Grant Grundler <grantgrundler@...il.com>
To:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
Cc:	grundler@...isc-linux.org, bhutchings@...arflare.com,
	arnd@...db.de, avi@...hat.com, mtosatti@...hat.com,
	linux-net-drivers@...arflare.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	kvm@...r.kernel.org, takuya.yoshikawa@...il.com
Subject: Re: [PATCH 2/4] drivers/net/ethernet/dec/tulip: Add tulip_ prefix to set_bit_le()

On Mon, Jun 11, 2012 at 5:30 AM, Takuya Yoshikawa
<yoshikawa.takuya@....ntt.co.jp> wrote:
> From: Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
>
> Needed to introduce generic set_bit_le().
>
> Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
> Cc: Grant Grundler <grundler@...isc-linux.org>
> ---
>  drivers/net/ethernet/dec/tulip/de2104x.c    |    7 +++----
>  drivers/net/ethernet/dec/tulip/tulip_core.c |    7 +++----
>  2 files changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/ethernet/dec/tulip/de2104x.c b/drivers/net/ethernet/dec/tulip/de2104x.c
> index 61cc093..e635f1a 100644
> --- a/drivers/net/ethernet/dec/tulip/de2104x.c
> +++ b/drivers/net/ethernet/dec/tulip/de2104x.c
> @@ -661,8 +661,7 @@ static netdev_tx_t de_start_xmit (struct sk_buff *skb,
>    new frame, not around filling de->setup_frame.  This is non-deterministic
>    when re-entered but still correct. */
>
> -#undef set_bit_le
> -#define set_bit_le(i,p) do { ((char *)(p))[(i)/8] |= (1<<((i)%8)); } while(0)
> +#define tulip_set_bit_le(i,p) do { ((char *)(p))[(i)/8] |= (1<<((i)%8)); } while(0)

I am ok with this patch going in. This code predates the clear
understanding of bit_ops that we have now and will continue to work
with this patch.

If you have time to follow Arnd's suggestion to use __set_bit_le()
(and removing both local definitions), that would be better. Either
way:

Acked-by: Grant Grundler <grundler@...isc-linux.org>

thanks!
grant

>
>  static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)
>  {
> @@ -673,12 +672,12 @@ static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)
>        u16 *eaddrs;
>
>        memset(hash_table, 0, sizeof(hash_table));
> -       set_bit_le(255, hash_table);                    /* Broadcast entry */
> +       tulip_set_bit_le(255, hash_table);              /* Broadcast entry */
>        /* This should work on big-endian machines as well. */
>        netdev_for_each_mc_addr(ha, dev) {
>                int index = ether_crc_le(ETH_ALEN, ha->addr) & 0x1ff;
>
> -               set_bit_le(index, hash_table);
> +               tulip_set_bit_le(index, hash_table);
>        }
>
>        for (i = 0; i < 32; i++) {
> diff --git a/drivers/net/ethernet/dec/tulip/tulip_core.c b/drivers/net/ethernet/dec/tulip/tulip_core.c
> index c4f37ac..3a1ebd02 100644
> --- a/drivers/net/ethernet/dec/tulip/tulip_core.c
> +++ b/drivers/net/ethernet/dec/tulip/tulip_core.c
> @@ -1010,8 +1010,7 @@ static int private_ioctl (struct net_device *dev, struct ifreq *rq, int cmd)
>    new frame, not around filling tp->setup_frame.  This is non-deterministic
>    when re-entered but still correct. */
>
> -#undef set_bit_le
> -#define set_bit_le(i,p) do { ((char *)(p))[(i)/8] |= (1<<((i)%8)); } while(0)
> +#define tulip_set_bit_le(i,p) do { ((char *)(p))[(i)/8] |= (1<<((i)%8)); } while(0)
>
>  static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)
>  {
> @@ -1022,12 +1021,12 @@ static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)
>        u16 *eaddrs;
>
>        memset(hash_table, 0, sizeof(hash_table));
> -       set_bit_le(255, hash_table);                    /* Broadcast entry */
> +       tulip_set_bit_le(255, hash_table);              /* Broadcast entry */
>        /* This should work on big-endian machines as well. */
>        netdev_for_each_mc_addr(ha, dev) {
>                int index = ether_crc_le(ETH_ALEN, ha->addr) & 0x1ff;
>
> -               set_bit_le(index, hash_table);
> +               tulip_set_bit_le(index, hash_table);
>        }
>        for (i = 0; i < 32; i++) {
>                *setup_frm++ = hash_table[i];
> --
> 1.7.5.4
>
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