Linus Torvalds wrote:

On Fri, 20 Jun 2008, Ingo Molnar wrote:
  

quoted

okay - Jeremy, could you try the fix below? (or tip/master, i just 
pushed this out)
    

Actually, don't try that one.

It needs to be a _byte_ registers, so "ir" was wrong. You need "iq".
  

Doesn't work, unfortunately:
{standard input}:20511: Error: Incorrect register `%eax' used with `b' 
suffix

        lock; orb %eax,1(%rdi)  # tmp64,

    J