linux-kernel - Re: [PATCH 2/5] drivers/net/ethernet/dec/tulip: Use standard __set_bit

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Date:	Wed, 13 Jun 2012 23:00:13 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Akinobu Mita <akinobu.mita@...il.com>
Cc:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>,
	akpm@...ux-foundation.org, bhutchings@...arflare.com,
	grundler@...isc-linux.org, arnd@...db.de, benh@...nel.crashing.org,
	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
Subject: Re: [PATCH 2/5] drivers/net/ethernet/dec/tulip: Use standard
 __set_bit_le() function

On Wed, 13 Jun 2012 22:31:13 +0900
Akinobu Mita <akinobu.mita@...il.com> wrote:

> >> Should this hash_table be converted from u16 hash_table[32] to
> >> DECLARE_BITMAP(hash_table, 16 * 32) to ensure that it is aligned
> >> on long-word boundary?
> >
> > I think hash_table is already long-word aligned because it is placed
> > right after a pointer.
> 
> I recommend converting to proper bitmap.  Because such an implicit
> assumption is easily broken by someone touching this function.

Do you mean something like:
	DECLARE_BITMAP(__hash_table, 16 * 32);
	u16 *hash_table = (u16 *)__hash_table;
?

Grant, what do you think about this?

	Takuya


===
drivers/net/ethernet/dec/tulip/tulip_core.c:

static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)
{
	struct tulip_private *tp = netdev_priv(dev);
	u16 hash_table[32];
	...
}

drivers/net/ethernet/dec/tulip/de2104x.c:

static void build_setup_frame_hash(u16 *setup_frm, struct net_device *dev)
{
	struct de_private *de = netdev_priv(dev);
	u16 hash_table[32];
	...
}
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