linux-kernel - Re: [RFC PATCH] introduce sys_membarrier(): process-wide memory barrier (v5)

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Date:	Thu, 21 Jan 2010 11:12:11 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Oleg Nesterov <oleg@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org, josh@...htriplett.org,
	tglx@...utronix.de, Valdis.Kletnieks@...edu, dhowells@...hat.com,
	laijs@...fujitsu.com, dipankar@...ibm.com
Subject: Re: [RFC PATCH] introduce sys_membarrier(): process-wide memory
 barrier (v5)

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