linux-kernel - Re: [PATCH 10/19] workqueue: update cwq alignement and make one more flag bit available

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Message-ID: <10133.1254402320@redhat.com>
Date:	Thu, 01 Oct 2009 14:05:20 +0100
From:	David Howells <dhowells@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	dhowells@...hat.com, jeff@...zik.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	jens.axboe@...cle.com, rusty@...tcorp.com.au,
	cl@...ux-foundation.org, arjan@...ux.intel.com
Subject: Re: [PATCH 10/19] workqueue: update cwq alignement and make one more flag bit available

Tejun Heo <tj@...nel.org> wrote:

> +enum {
> +	WORK_STRUCT_PENDING	= 0,	/* work item is pending execution */
> +
> +	/*
> +	 * Reserve 3bits off of cwq pointer.  This is enough and
> +	 * provides acceptable alignment on both 32 and 64bit
> +	 * machines.
> +	 */
> +	WORK_STRUCT_FLAG_BITS	= 3,
> +
> +	WORK_STRUCT_FLAG_MASK	= (1UL << WORK_STRUCT_FLAG_BITS) - 1,
> +	WORK_STRUCT_WQ_DATA_MASK = ~WORK_STRUCT_FLAG_MASK,
> +};

There's some great enum abuse going on here:-)

David
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