linux-kernel - Re: [PATCH] rcu: Remove redundant rcu_is_cpu_rrupt_from

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Message-ID: <20141029134519.GC30198@agordeev.usersys.redhat.com>
Date:	Wed, 29 Oct 2014 13:45:19 +0000
From:	Alexander Gordeev <agordeev@...hat.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcu: Remove redundant rcu_is_cpu_rrupt_from_idle()
 function

On Wed, Oct 29, 2014 at 05:47:29AM -0700, Paul E. McKenney wrote:
> On Wed, Oct 29, 2014 at 12:07:07PM +0100, Alexander Gordeev wrote:
> > Function rcu_is_cpu_rrupt_from_idle() is called from scheduling-
> > clock interrupt handler to check if the current CPU was interrupted
> > from idle. If true, it results in invocation of RCU callbacks. But
> > the common hardware interrupt exit path also contains similar check
> > and therefore the call to rcu_is_cpu_rrupt_from_idle() is redundant.
> 
> By common hardware interrupt exit path, you are meaning the calls
> to rcu_irq_exit()?  If not, please let me know exactly what you
> mean here.

Yes, I mean rcu_irq_exit().

> 							Thanx, Paul

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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