linux-kernel - Re: [PATCH] genirq/affinity: fix node generation from cpumask

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Date:   Thu, 15 Dec 2016 10:36:52 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Gavin Shan <gwshan@...ux.vnet.ibm.com>
cc:     "Guilherme G. Piccoli" <gpiccoli@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
        Christoph Hellwig <hch@....de>, linuxppc-dev@...ts.ozlabs.org,
        gabriel@...sman.be
Subject: Re: [PATCH] genirq/affinity: fix node generation from cpumask

On Thu, 15 Dec 2016, Gavin Shan wrote:
> > static int get_nodes_in_cpumask(const struct cpumask *mask, nodemask_t *nodemsk)
> > {
> >-	int n, nodes;
> >+	int n, nodes = 0;
> >
> > 	/* Calculate the number of nodes in the supplied affinity mask */
> >-	for (n = 0, nodes = 0; n < num_online_nodes(); n++) {
> >+	for_each_online_node(n)
> > 		if (cpumask_intersects(mask, cpumask_of_node(n))) {
> > 			node_set(n, *nodemsk);
> > 			nodes++;
> > 		}
> >-	}
> >+
> 
> It'd better to keep the brackets so that we needn't add them when adding
> more code into the block next time.

Removing the brackets is outright wrong. See:
  https://marc.info/?l=linux-kernel&m=147351236615103

I'll fix that up when applying the patch.

Thanks,

	tglx