Messages in this thread Patch in this message | | | From | Keith Busch <> | Subject | [PATCH] irq/affinity: Fix extra vecs calculation | Date | Thu, 13 Apr 2017 13:28:12 -0400 |
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This fixes a math error calculating the extra_vecs. The error assumed only 1 cpu per vector, but the value needs to account for the actual number of cpus per vector in order to get the correct remainder for extra CPU assignment.
Fixes: 7bf8222b9bd0 ("irq/affinity: Fix CPU spread for unbalanced nodes") Reported-by: Xiaolong Ye <xiaolong.ye@intel.com> Signed-off-by: Keith Busch <keith.busch@intel.com> --- kernel/irq/affinity.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c index dc52911..d052947 100644 --- a/kernel/irq/affinity.c +++ b/kernel/irq/affinity.c @@ -108,7 +108,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd) vecs_to_assign = min(vecs_per_node, ncpus); /* Account for rounding errors */ - extra_vecs = ncpus - vecs_to_assign; + extra_vecs = ncpus - vecs_to_assign * (ncpus / vecs_to_assign); for (v = 0; curvec < last_affv && v < vecs_to_assign; curvec++, v++) { -- 2.7.2
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