linux-kernel - Re: [PATCH -tip] v3 Simplify rcu_pending()/rcu_check

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Date:	Mon, 24 Aug 2009 09:10:16 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josht@...ux.vnet.ibm.com,
	dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de,
	rostedt@...dmis.org
Subject: Re: [PATCH -tip] v3 Simplify rcu_pending()/rcu_check_callbacks()
 API

On Sat, 2009-08-22 at 13:56 -0700, Paul E. McKenney wrote:
> From: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> All calls from outside RCU are of the form:
> 
> 	if (rcu_pending(cpu))
> 		rcu_check_callbacks(cpu, user);
> 
> This is silly, instead we put a call to rcu_pending() in
> rcu_check_callbacks(),

It could be non-silly if rcu_pending() were a very simple inline
function, in that case it would avoid the full function call.

Still in such a case you can make rcu_check_callbacks() the inline
function which does the same and have the real function called somthing
else.

Anyway, its all moot since rcu_pending() wasn't a simple inline function
anyway, so you've replaced two function calls with one, which seems
good.
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