Date: Wed, 2 Dec 2009 08:55:17 -0600 (CST)
From: Christoph Lameter <cl@linux-foundation.org>
To: Tejun Heo <tj@kernel.org>
cc: Ingo Molnar <mingo@elte.hu>, Stephen Rothwell <sfr@canb.auug.org.au>,
       michal.simek@petalogix.com, linux-next@vger.kernel.org,
       LKML <linux-kernel@vger.kernel.org>,
       Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: problems in linux-next (Was: Re: linux-next: Tree for December
 1)
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On Wed, 2 Dec 2009, Tejun Heo wrote:

> This isn't usual alignment.  struct work_struct has one data fields
> which is overloaded for two purposes.  Lower few bits are used to
> carry flags while upper bits are used to point to sruct
> cpu_workqueue_struct.  So, the number of available bits for flags are
> determined by the alignment of cpu_workqueue_struct.  Memory usage for

The default mininum slab alignment in UP is 8 bytes which means you can
use 3 bits. And as far as I can see only the lower two bits are used. You
still have one bit leftover. (current upstream that is did not check if
you modified it).

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