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authorChristoph Hellwig <hch@lst.de>2016-11-15 10:12:58 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-11-16 18:44:01 +0100
commitbfe130773862bb3a02cdc4d4c2169f7f0210a46b (patch)
treee026aa41056eb5d31188f47fc0b499566ae6ab91
parent0cf71b04467bc34063cecae577f12481da6cc565 (diff)
downloadlinux-bfe130773862bb3a02cdc4d4c2169f7f0210a46b.tar.bz2
genirq/affinity: Take reserved vectors into account when spreading irqs
The recent addition of reserved vectors at the beginning or the end of the vector space did not take the reserved vectors at the beginning into account for the various loop exit conditions. As a consequence the last vectors of the spread area are not included into the spread algorithm and are treated like the reserved vectors at the end of the vector space and get the default affinity mask assigned. Sum up the affinity vectors and the reserved vectors at the beginning and use the sum as exit condition. [ tglx: Fixed all conditions instead of only one and massaged changelog ] Signed-off-by: Christoph Hellwig <hch@lst.de> Link: http://lkml.kernel.org/r/1479201178-29604-2-git-send-email-hch@lst.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--kernel/irq/affinity.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index 17360bd9619b..49eb38d48816 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -61,6 +61,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
{
int n, nodes, vecs_per_node, cpus_per_vec, extra_vecs, curvec;
int affv = nvecs - affd->pre_vectors - affd->post_vectors;
+ int last_affv = affv + affd->pre_vectors;
nodemask_t nodemsk = NODE_MASK_NONE;
struct cpumask *masks;
cpumask_var_t nmsk;
@@ -87,7 +88,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
if (affv <= nodes) {
for_each_node_mask(n, nodemsk) {
cpumask_copy(masks + curvec, cpumask_of_node(n));
- if (++curvec == affv)
+ if (++curvec == last_affv)
break;
}
goto done;
@@ -107,7 +108,8 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
/* Calculate the number of cpus per vector */
ncpus = cpumask_weight(nmsk);
- for (v = 0; curvec < affv && v < vecs_to_assign; curvec++, v++) {
+ for (v = 0; curvec < last_affv && v < vecs_to_assign;
+ curvec++, v++) {
cpus_per_vec = ncpus / vecs_to_assign;
/* Account for extra vectors to compensate rounding errors */
@@ -119,7 +121,7 @@ irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
irq_spread_init_one(masks + curvec, nmsk, cpus_per_vec);
}
- if (curvec >= affv)
+ if (curvec >= last_affv)
break;
}