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authorKeith Busch <keith.busch@intel.com>2017-04-19 19:51:10 -0400
committerThomas Gleixner <tglx@linutronix.de>2017-04-20 16:03:09 +0200
commitb72f8051f34b8164a62391e3676edc34523c5952 (patch)
parentf61143c45077df4fa78e2f1ba455a00bbe1d5b8c (diff)
genirq/affinity: Fix calculating vectors to assign
The vectors_per_node is calculated from the remaining available vectors. The current vector starts after pre_vectors, so we need to subtract that from the current to properly account for the number of remaining vectors to assign. Fixes: 3412386b531 ("irq/affinity: Fix extra vecs calculation") Reported-by: Andrei Vagin <avagin@virtuozzo.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Link: http://lkml.kernel.org/r/1492645870-13019-1-git-send-email-keith.busch@intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index d052947fe785..e2d356dd7581 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -98,7 +98,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
int ncpus, v, vecs_to_assign, vecs_per_node;
/* Spread the vectors per node */
- vecs_per_node = (affv - curvec) / nodes;
+ vecs_per_node = (affv - (curvec - affd->pre_vectors)) / nodes;
/* Get the cpus on this node which are in the mask */
cpumask_and(nmsk, cpu_online_mask, cpumask_of_node(n));