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

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Message-ID: <1339600457.2612.2.camel@bwh-desktop.uk.solarflarecom.com>
Date:	Wed, 13 Jun 2012 16:14:17 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
CC:	Akinobu Mita <akinobu.mita@...il.com>,
	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>,
	<akpm@...ux-foundation.org>, <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, 2012-06-13 at 23:00 +0900, Takuya Yoshikawa wrote:
> 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;
> ?
[...]

Could this driver perhaps use:

	union hash_table {
		DECLARE_BITMAP(bits, 16 * 32);
		__le16 words[32];
	};

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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