# Re: \[PATCH v2 2/5\] firmware: Basic dmi-sysfs support

- From: Greg KH \<hidden\>
- Date: 2011-02-25 20:00:08 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2011/02/3682922
- Thread: https://ratatoskr.run/linux-api/2011/02/3681559/t.md

```text
On Wed, Feb 23, 2011 at 01:29:46PM -0800, Tony Luck wrote:
> On Wed, Feb 23, 2011 at 12:28 PM, Mike Waychison [ref] wrote:
> > Ya, I don't think there is anything that guarantees that dmi_header is
> > aligned.   The access is probably the struct copy I did here:
> >
> >        /* Set the key */
> >        entry->dh = *dh;
> 
> Yup - looking back at the assembly I see that one of the 2-byte
> accesses is offset 2
> (picking up ->handle), but the second is offset 0 (picking up ->type
> and ->length). The
> compiler assumed the structure was 2-byte aligned because of ->handle.
> 
> > What if we changed that guy to use memcpy?  We'd probably need to
> > memcpy the dmi_system_event_log as well.  Patch attached (applies on
> > top of the entire patchset).
> 
> With the patch, all the unaligned accesses go away.
> 
> Tested-by: Tony Luck <redacted>

Great!

Mike, care to resend this last patch as a 6/5 patch with a proper
subject, changelog comment, and signed-off-by: section so that I can
queue it up?

thanks,

greg k-h
```