Re: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks

Keir Fraser
Wed, 05 Oct 2005 21:46:45 -0000

On 5 Oct 2005, at 19:27, Puthiyaparambil, Aravindh wrote:

> Does anyone know if there are other places where the "lock"
prefix is
> used with a cache misaligned address?

x86 systems are supposed to guarantee that LOCKed instructions access
their memory operand atomically, regardless of alignment (Vol 3 of the
Intel reference manual). Your systems break this application-visible
guarantee?

  -- Keir