Commit 060746d9 authored by Ming Lei's avatar Ming Lei Committed by Thomas Gleixner
Browse files

genirq/affinity: Pass first vector to __irq_build_affinity_masks() 



No functional change.

Prepares for support of allocating and affinitizing sets of interrupts, in
which each set of interrupts needs a full two stage spreading. The first
vector argument is necessary for this so the affinitizing starts from the
first vector of each set.

[ tglx: Minor changelog tweaks ]

Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Cc: Hannes Reinecke <hare@suse.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Link: https://lkml.kernel.org/r/20181102145951.31979-4-ming.lei@redhat.com
parent 5c903e10

kernel/irq/affinity.c

+11 −9
Original line number Diff line number Diff line
@@ -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;
@@ -119,7 +119,7 @@ static int __irq_build_affinity_masks(const struct irq_affinity *affd, 
		for_each_node_mask(n, nodemsk) {

			cpumask_or(masks + curvec, masks + curvec, node_to_cpumask[n]);

			if (++curvec == last_affv)

				curvec = affd->pre_vectors;

				curvec = firstvec;

		}

		done = numvecs;

		goto out;
@@ -129,7 +129,7 @@ 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]);
@@ -157,7 +157,7 @@ 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;

	}
@@ -190,8 +190,9 @@ 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
@@ -205,6 +206,7 @@ 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,

					       affd->pre_vectors,

					       node_to_cpumask, npresmsk,

					       nmsk, masks);

	put_online_cpus();

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