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Commit 3412386b authored by Keith Busch's avatar Keith Busch Committed by Thomas Gleixner
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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: 7bf8222b ("irq/affinity: Fix CPU spread for unbalanced nodes")
Reported-by: default avatarXiaolong Ye <xiaolong.ye@intel.com>
Signed-off-by: default avatarKeith Busch <keith.busch@intel.com>
Link: http://lkml.kernel.org/r/1492104492-19943-1-git-send-email-keith.busch@intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 7bf8222b

kernel/irq/affinity.c

+1 −1
Original line number Diff line number Diff line
@@ -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++) {