Chris Metcalf ab306cae66 arch/tile: use atomic exchange in arch_write_unlock() ...

This idiom is used elsewhere when we do an unlock by writing a zero,
but I missed it here.  Using an atomic operation avoids waiting
on the write buffer for the unlocking write to be sent to the home cache.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

2012-04-02 12:13:49 -04:00

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