Chris Snook wrote:
From: Chris Snook <[email protected]>
Make atomic_read() volatile on frv. This ensures that busy-waiting
for an interrupt handler to change an atomic_t won't get compiled to an
infinite loop, consistent with SMP architectures.
To head off the criticism, I admit this is an oversimplification, and true
busy-waiters should be using cpu_relax(), which contains a barrier. As
discussed in recent threads, there are other cases which can be optimized by
removing the need for a barrier, and having behavior consistent with
architectures where the benefit is more profound is also valuable.
-- Chris
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