Re: [RFC PATCH] introduce sys_membarrier(): process-wide memorybarrier (v5)

[Steven Rostedt]

On Thu, 2010-01-21 at 11:07 -0500, Mathieu Desnoyers wrote:
> * Peter Zijlstra (peterz@xxxxxxxxxxxxx) wrote:

> We can even create a generic fallback with the following kind of code in
> the meantime:
> 
> static inline void spin_lock_mb(spinlock_t *lock)
> {
> 	spin_lock(&lock);

That would be spin_lock(lock);

> 	smp_mb();
> }
> 
> static inline void spin_unlock_mb(spinlock_t *lock)
> {
> 	smp_mb();
> 	spin_unlock(&lock);

and spin_unlock(lock);

;-)

> }
> 
> How does that sound ?

You may also need spin_lock_irqsave, et al. variants too.

-- Steve


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