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.
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