Patch "genirq/affinity: Don't pass irq_affinity_desc array to irq_build_affinity_masks" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    genirq/affinity: Don't pass irq_affinity_desc array to irq_build_affinity_masks

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     genirq-affinity-don-t-pass-irq_affinity_desc-array-t.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 88fe3a4d6d033d9103e986952d44d4c647deba38
Author: Ming Lei <ming.lei@xxxxxxxxxx>
Date:   Tue Dec 27 10:29:02 2022 +0800

    genirq/affinity: Don't pass irq_affinity_desc array to irq_build_affinity_masks
    
    [ Upstream commit e7bdd7f0cbd1c001bb9b4d3313edc5ee094bc3f8 ]
    
    Prepare for abstracting irq_build_affinity_masks() into a public function
    for assigning all CPUs evenly into several groups.
    
    Don't pass irq_affinity_desc array to irq_build_affinity_masks, instead
    return a cpumask array by storing each assigned group into one element of
    the array.
    
    This allows to provide a generic interface for grouping all CPUs evenly
    from a NUMA and CPU locality viewpoint, and the cost is one extra allocation
    in irq_build_affinity_masks(), which should be fine since it is done via
    GFP_KERNEL and irq_build_affinity_masks() is a slow path anyway.
    
    Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
    Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
    Reviewed-by: Christoph Hellwig <hch@xxxxxx>
    Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx>
    Reviewed-by: Jens Axboe <axboe@xxxxxxxxx>
    Link: https://lore.kernel.org/r/20221227022905.352674-4-ming.lei@xxxxxxxxxx
    Stable-dep-of: 0263f92fadbb ("lib/group_cpus.c: avoid acquiring cpu hotplug lock in group_cpus_evenly")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/kernel/irq/affinity.c b/kernel/irq/affinity.c
index da6379cd27fd4..00bba1020ecb2 100644
--- a/kernel/irq/affinity.c
+++ b/kernel/irq/affinity.c
@@ -249,7 +249,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
 				      cpumask_var_t *node_to_cpumask,
 				      const struct cpumask *cpu_mask,
 				      struct cpumask *nmsk,
-				      struct irq_affinity_desc *masks)
+				      struct cpumask *masks)
 {
 	unsigned int i, n, nodes, cpus_per_vec, extra_vecs, done = 0;
 	unsigned int last_affv = numvecs;
@@ -270,7 +270,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
 		for_each_node_mask(n, nodemsk) {
 			/* Ensure that only CPUs which are in both masks are set */
 			cpumask_and(nmsk, cpu_mask, node_to_cpumask[n]);
-			cpumask_or(&masks[curvec].mask, &masks[curvec].mask, nmsk);
+			cpumask_or(&masks[curvec], &masks[curvec], nmsk);
 			if (++curvec == last_affv)
 				curvec = 0;
 		}
@@ -321,7 +321,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
 			 */
 			if (curvec >= last_affv)
 				curvec = 0;
-			irq_spread_init_one(&masks[curvec].mask, nmsk,
+			irq_spread_init_one(&masks[curvec], nmsk,
 						cpus_per_vec);
 		}
 		done += nv->nvectors;
@@ -335,16 +335,16 @@ static int __irq_build_affinity_masks(unsigned int startvec,
  *	1) spread present CPU on these vectors
  *	2) spread other possible CPUs on these vectors
  */
-static int irq_build_affinity_masks(unsigned int numvecs,
-				    struct irq_affinity_desc *masks)
+static struct cpumask *irq_build_affinity_masks(unsigned int numvecs)
 {
 	unsigned int curvec = 0, nr_present = 0, nr_others = 0;
 	cpumask_var_t *node_to_cpumask;
 	cpumask_var_t nmsk, npresmsk;
 	int ret = -ENOMEM;
+	struct cpumask *masks = NULL;
 
 	if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
-		return ret;
+		return NULL;
 
 	if (!zalloc_cpumask_var(&npresmsk, GFP_KERNEL))
 		goto fail_nmsk;
@@ -353,6 +353,10 @@ static int irq_build_affinity_masks(unsigned int numvecs,
 	if (!node_to_cpumask)
 		goto fail_npresmsk;
 
+	masks = kcalloc(numvecs, sizeof(*masks), GFP_KERNEL);
+	if (!masks)
+		goto fail_node_to_cpumask;
+
 	/* Stabilize the cpumasks */
 	cpus_read_lock();
 	build_node_to_cpumask(node_to_cpumask);
@@ -386,6 +390,7 @@ static int irq_build_affinity_masks(unsigned int numvecs,
 	if (ret >= 0)
 		WARN_ON(nr_present + nr_others < numvecs);
 
+ fail_node_to_cpumask:
 	free_node_to_cpumask(node_to_cpumask);
 
  fail_npresmsk:
@@ -393,7 +398,11 @@ static int irq_build_affinity_masks(unsigned int numvecs,
 
  fail_nmsk:
 	free_cpumask_var(nmsk);
-	return ret < 0 ? ret : 0;
+	if (ret < 0) {
+		kfree(masks);
+		return NULL;
+	}
+	return masks;
 }
 
 static void default_calc_sets(struct irq_affinity *affd, unsigned int affvecs)
@@ -457,13 +466,18 @@ irq_create_affinity_masks(unsigned int nvecs, struct irq_affinity *affd)
 	 */
 	for (i = 0, usedvecs = 0; i < affd->nr_sets; i++) {
 		unsigned int this_vecs = affd->set_size[i];
-		int ret;
+		int j;
+		struct cpumask *result = irq_build_affinity_masks(this_vecs);
 
-		ret = irq_build_affinity_masks(this_vecs, &masks[curvec]);
-		if (ret) {
+		if (!result) {
 			kfree(masks);
 			return NULL;
 		}
+
+		for (j = 0; j < this_vecs; j++)
+			cpumask_copy(&masks[curvec + j].mask, &result[j]);
+		kfree(result);
+
 		curvec += this_vecs;
 		usedvecs += this_vecs;
 	}




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