Re: [PATCH v3 10/25] openrisc: add spinlock implementation

[Peter Zijlstra]

On Wed, Feb 22, 2017 at 04:11:39AM +0900, Stafford Horne wrote:
> +static inline void arch_spin_unlock(arch_spinlock_t *lock)
> +{
> +	smp_mb();
> +	lock->tickets.owner++;
> +}

This is putting a lot of trust in the compiler, nothing is volatile so
it can do horrible things.