linux-kernel - [PATCH v3 4/5] genirq/affinity: allow driver's discontigous affinity set

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Date:   Mon, 24 Jun 2019 22:29:36 +0800
From:   Weiping Zhang <zhangweiping@...iglobal.com>
To:     <tglx@...utronix.de>, <axboe@...nel.dk>, <tj@...nel.org>,
        <hch@....de>, <bvanassche@....org>, <keith.busch@...el.com>,
        <minwoo.im.dev@...il.com>
CC:     <linux-block@...r.kernel.org>, <cgroups@...r.kernel.org>,
        <linux-nvme@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 4/5] genirq/affinity: allow driver's discontigous affinity
 set

The driver may implement multiple affinity set, and some of
are empty, for this case we just skip them.

Signed-off-by: Weiping Zhang <zhangweiping@...iglobal.com>
---
 kernel/irq/affinity.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index f18cd5aa33e8..6d964fe0fbd8 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -295,6 +295,10 @@ irq_create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
 		unsigned int this_vecs = affd->set_size[i];
 		int ret;
 
+		/* skip empty affinity set */
+		if (this_vecs == 0)
+			continue;
+
 		ret = irq_build_affinity_masks(affd, curvec, this_vecs,
 					       curvec, masks);
 		if (ret) {
-- 
2.14.1