alignment faults in 3.6

[Eric Dumazet]

On Fri, 2012-10-12 at 10:22 -0400, Benjamin LaHaise wrote:
> On Fri, Oct 12, 2012 at 02:08:12PM +0200, Eric Dumazet wrote:
> > So yes, we built network stack with the prereq that IP headers are
> > aligned, but unfortunately many developers use x86 which doesnt care, so
> > its possible some bugs are added.
> 
> x86 does have an alignment check flag that can be set in the flags register.  
> Somehow, I doubt anyone would be willing to walk through all the noise the 
> faults would likely trigger.

If this can be mapped to an event that can be used by perf tool, that
might be useful ?