Robert Love wrote:

...
+static inline void cond_resched_lock(spinlock_t * lock)
+{
+       if (need_resched() && preempt_count() == 1) {
+               _raw_spin_unlock(lock);
+               preempt_enable_no_resched();
+               __cond_resched();
+               spin_lock(lock);
+       }
+}

Maybe I'm being thick.  How come a simple spin_unlock() in here
won't do the right thing?

And this won't _really_ compile to nothing with CONFIG_PREEMPT=n,
will it?  It just does nothing because preempt_count() is zero?


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