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Subject[PATCH 3/4] irq: pass first vector to __irq_build_affinity_masks
Date
No functional change, and prepare for the following patch to
support allocating (and affinitizing) sets of IRQs, in which
each set of IRQ needs whole 2-stage spread, and the 1st vector
should point to the 1st one in this set.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Cc: Hannes Reinecke <hare@suse.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
kernel/irq/affinity.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index a16b601604aa..9c74f21ab10e 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -95,14 +95,14 @@ static int get_nodes_in_cpumask(cpumask_var_t *node_to_cpumask,
}

static int __irq_build_affinity_masks(const struct irq_affinity *affd,
- int startvec, int numvecs,
+ int startvec, int numvecs, int firstvec,
cpumask_var_t *node_to_cpumask,
const struct cpumask *cpu_mask,
struct cpumask *nmsk,
struct cpumask *masks)
{
int n, nodes, cpus_per_vec, extra_vecs, done = 0;
- int last_affv = affd->pre_vectors + numvecs;
+ int last_affv = firstvec + numvecs;
int curvec = startvec;
nodemask_t nodemsk = NODE_MASK_NONE;

@@ -121,7 +121,7 @@ static int __irq_build_affinity_masks(const struct irq_affinity *affd,
if (++done == numvecs)
break;
if (++curvec == last_affv)
- curvec = affd->pre_vectors;
+ curvec = firstvec;
}
goto out;
}
@@ -130,7 +130,7 @@ static int __irq_build_affinity_masks(const struct irq_affinity *affd,
int ncpus, v, vecs_to_assign, vecs_per_node;

/* Spread the vectors per node */
- vecs_per_node = (numvecs - (curvec - affd->pre_vectors)) / nodes;
+ vecs_per_node = (numvecs - (curvec - firstvec)) / nodes;

/* Get the cpus on this node which are in the mask */
cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
@@ -158,7 +158,7 @@ static int __irq_build_affinity_masks(const struct irq_affinity *affd,
if (done >= numvecs)
break;
if (curvec >= last_affv)
- curvec = affd->pre_vectors;
+ curvec = firstvec;
--nodes;
}

@@ -191,8 +191,8 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,

/* Spread on present CPUs starting from affd->pre_vectors */
usedvecs = __irq_build_affinity_masks(affd, curvec, numvecs,
- node_to_cpumask, cpu_present_mask,
- nmsk, masks);
+ affd->pre_vectors, node_to_cpumask,
+ cpu_present_mask, nmsk, masks);

/*
* Spread on non present CPUs starting from the next vector to be
@@ -206,8 +206,8 @@ static int irq_build_affinity_masks(const struct irq_affinity *affd,
curvec = affd->pre_vectors + usedvecs;
cpumask_andnot(npresmsk, cpu_possible_mask, cpu_present_mask);
usedvecs += __irq_build_affinity_masks(affd, curvec, numvecs,
- node_to_cpumask, npresmsk,
- nmsk, masks);
+ affd->pre_vectors, node_to_cpumask, npresmsk,
+ nmsk, masks);
put_online_cpus();

free_cpumask_var(npresmsk);
--
2.9.5
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