From: Keith Busch Date: Thu, 13 Apr 2017 17:28:12 +0000 (-0400) Subject: irq/affinity: Fix extra vecs calculation X-Git-Tag: v4.11-rc7~15^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3412386b531244f24a27c79ee003506a52a00848;p=platform%2Fkernel%2Flinux-exynos.git irq/affinity: Fix extra vecs calculation 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 Signed-off-by: Keith Busch Link: http://lkml.kernel.org/r/1492104492-19943-1-git-send-email-keith.busch@intel.com Signed-off-by: Thomas Gleixner --- 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++) {