linux-kernel - Re: kernel unaligned accesses on 2.6.29.

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Message-ID: <20090325012101.GC8908@sgi.com>
Date:	Tue, 24 Mar 2009 20:21:01 -0500
From:	Robin Holt <holt@....com>
To:	Chuck Lever <chuck.lever@...cle.com>, tony.luck@...el.com
Cc:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: kernel unaligned accesses on 2.6.29.

On Tue, Mar 24, 2009 at 08:14:18PM -0500, Robin Holt wrote:
> Had a few minutes to look around.
...
> This one is:
> 	u64 *p = (u64 *)&nsm->sm_priv.data;
> 	...
> 	*p = (unsigned long)nsm;
...
> >     e3d0:       0a 60 28 1c 8d 39       [MMI]       cmp4.eq p12,p13=10,r14;;
> >     e3d6:       00 a8 95 30 23 00                   st8 [r37]=r53
> 

Well, that was easy.  This is the store part of
	*p++ = timespec_to_ns(&ts);

Again, comes down to &nsm->sm_priv.data not being aligned.

Robin
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