On Tue, Jan 02, 2001 at 11:22:42AM +0000, Matthew Wilcox wrote:
> 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.
The network code relies on the reader-xchg semantics David described in
several places.
-Andi
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