Re: [PATCH] rcu: don't call rcu_preempt_note_context_switch() inrcu_check_callbacks()

From: Lai Jiangshan
Date: Thu Apr 01 2010 - 03:23:55 EST

Paul E. McKenney wrote:
> Possibly by moving the clearing of RCU_READ_UNLOCK_NEED_QS to
> rcu_preempt_check_callbacks()

current rcu_preempt_check_callbacks() already has code to

> -- or to rcu_preempt_qs(). The latter is in
> some sense cleaner, but higher overhead and probably unnecessary. Hmmm...
> Alternatively, require that all callers to rcu_preempt_qs() disable
> irqs. This affects only one callsite, which has a local_irq_disable()
> immediately following anyway. ;-)
> Thanx, Paul

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