linux-kernel - Re: [PATCH tip/core/rcu 02/12] rcu: Panic if RCU tree can not accommodate all CPUs

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Message-ID: <20150730122835.GX19282@twins.programming.kicks-ass.net>
Date:	Thu, 30 Jul 2015 14:28:35 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, oleg@...hat.com, bobby.prani@...il.com,
	Alexander Gordeev <agordeev@...hat.com>
Subject: Re: [PATCH tip/core/rcu 02/12] rcu: Panic if RCU tree can not
 accommodate all CPUs

On Fri, Jul 17, 2015 at 03:30:53PM -0700, Paul E. McKenney wrote:
> +	if (n > rcu_capacity[MAX_RCU_LVLS])
> +		panic("rcu_init_geometry: rcu_capacity[] is too small");

How can this ever happen? We _know_ NR_CPUS at compile time, there's no
way we can get more CPUs than that -- even if the hardware has more,
we'll stop enumerating.
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