linux-kernel - [PATCH V4 1/3] genirq/affinity: Enhance warning check

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Date:   Wed, 14 Aug 2019 16:40:42 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Keith Busch <kbusch@...nel.org>,
        linux-nvme@...ts.infradead.org,
        Jon Derrick <jonathan.derrick@...el.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH V4 1/3] genirq/affinity: Enhance warning check

The two-stage spread is done on same irq vectors, and we just need that
either one stage covers all vector, not two stage work together to cover
all vectors.

So enhance the warning check to make sure all vectors are spread.

Cc: Christoph Hellwig <hch@....de>
Cc: Keith Busch <kbusch@...nel.org>
Cc: linux-nvme@...ts.infradead.org,
Cc: Jon Derrick <jonathan.derrick@...el.com>
Cc: Jens Axboe <axboe@...nel.dk>
Fixes: 6da4b3ab9a6 ("genirq/affinity: Add support for allocating interrupt sets")
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 kernel/irq/affinity.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 6fef48033f96..265b3076f16b 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -215,8 +215,7 @@ static int irq_build_affinity_masks(unsigned int startvec, unsigned int numvecs,
 					       npresmsk, nmsk, masks);
 	put_online_cpus();
 
-	if (nr_present < numvecs)
-		WARN_ON(nr_present + nr_others < numvecs);
+	WARN_ON(max(nr_present, nr_others) < numvecs);
 
 	free_node_to_cpumask(node_to_cpumask);
 
-- 
2.20.1