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

From: Greg KH
Date: Fri Feb 25 2011 - 15:00:15 EST

On Wed, Feb 23, 2011 at 01:29:46PM -0800, Tony Luck wrote:
> On Wed, Feb 23, 2011 at 12:28 PM, Mike Waychison <mikew@xxxxxxxxxx> 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 <tony.luck@xxxxxxxxx>


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?


greg k-h
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