On Tue, Jan 02, 2001 at 01:03:48AM -0800, David S. Miller wrote: > If you require an external agent (f.e. your spinlock) because you > cannot implement xchg with a real atomic sequence, this breaks the > above assumptions. We really can't. We _only_ have load-and-zero. And it has to be 16-byte aligned. xchg() is just not something the CPU implements. -- Revolutions do not require corporate support.