linux-kernel - Re: [PATCH v3 4/5] slub: Only IPI CPUs that have per cpu obj to flush

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Date:	Tue, 15 Nov 2011 09:54:53 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Russell King <linux@....linux.org.uk>, linux-mm@...ck.org,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Sasha Levin <levinsasha928@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v3 4/5] slub: Only IPI CPUs that have per cpu obj to
 flush

On Sun, 13 Nov 2011, Gilad Ben-Yossef wrote:

> @@ -2006,7 +2006,20 @@ static void flush_cpu_slab(void *d)
> +	if (likely(zalloc_cpumask_var(&cpus, GFP_ATOMIC))) {
> +		for_each_online_cpu(cpu) {
> +			c = per_cpu_ptr(s->cpu_slab, cpu);
> +			if (c && c->page)

c will never be null. No need to check.

Otherwise

Acked-by: Christoph Lameter <cl@...ux.com>

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