[head tinderbox] failure on sparc64/sun4v

[John Baldwin]

On Saturday 04 November 2006 06:06, Peter Jeremy wrote:
> On Fri, 2006-Nov-03 23:46:27 -0800, Kip Macy wrote:
> >Sparc64 only supports CAS on 4 and 8 byte quantities. The only
> >operation it support on 16 bytes is load.
> 
> The '16' in 'atomic_add_16' is bits.  Few RISC architectures can
> support atomic operations (or primitives to build atomic ops) on
> anything other than their native word side and 32 bits.
> 
> The problem is that SCTP is using a 16-bit refcnt and trying to
> manipulate it atomically.  This is problematic on anything except i386
> and amd64.  The easiest solution seems to be to change refcnt to an
> [u]int - though I'm not sure what other impacts this may have.

And if possible it should just use 'refcount_*()' instead of 'atomic_*()' 
directly.

-- 
John Baldwin