+ mm-damon-core-commit-damos-migrate_dests.patch added to mm-new branch

+ mm-damon-core-commit-damos-migrate_dests.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/core: commit damos->migrate_dests
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-core-commit-damos-migrate_dests.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-commit-damos-migrate_dests.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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------------------------------------------------------
From: Bijan Tabatabai <bijantabatab@micron.com>
Subject: mm/damon/core: commit damos->migrate_dests
Date: Tue, 8 Jul 2025 19:59:37 -0500

When committing new scheme parameters from the sysfs, copy the
migrate_dests struct of the source schemes into the destination schemes.

Link: https://lkml.kernel.org/r/20250709005952.17776-8-bijan311@gmail.com
Signed-off-by: Bijan Tabatabai <bijantabatab@micron.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ravi Shankar Jonnalagadda <ravis.opensrc@micron.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/core.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

--- a/mm/damon/core.c~mm-damon-core-commit-damos-migrate_dests
+++ a/mm/damon/core.c
@@ -943,6 +943,41 @@ static void damos_set_filters_default_re
 		damos_filters_default_reject(&s->ops_filters);
 }
 
+static int damos_commit_dests(struct damos *dst, struct damos *src)
+{
+	struct damos_migrate_dests *dst_dests, *src_dests;
+
+	dst_dests = &dst->migrate_dests;
+	src_dests = &src->migrate_dests;
+
+	if (dst_dests->nr_dests != src_dests->nr_dests) {
+		kfree(dst_dests->node_id_arr);
+		kfree(dst_dests->weight_arr);
+
+		dst_dests->node_id_arr = kmalloc_array(src_dests->nr_dests,
+			sizeof(*dst_dests->node_id_arr), GFP_KERNEL);
+		if (!dst_dests->node_id_arr) {
+			dst_dests->weight_arr = NULL;
+			return -ENOMEM;
+		}
+
+		dst_dests->weight_arr = kmalloc_array(src_dests->nr_dests,
+			sizeof(*dst_dests->weight_arr), GFP_KERNEL);
+		if (!dst_dests->weight_arr) {
+			/* ->node_id_arr will be freed by scheme destruction */
+			return -ENOMEM;
+		}
+	}
+
+	dst_dests->nr_dests = src_dests->nr_dests;
+	for (int i = 0; i < src_dests->nr_dests; i++) {
+		dst_dests->node_id_arr[i] = src_dests->node_id_arr[i];
+		dst_dests->weight_arr[i] = src_dests->weight_arr[i];
+	}
+
+	return 0;
+}
+
 static int damos_commit_filters(struct damos *dst, struct damos *src)
 {
 	int err;
@@ -984,6 +1019,10 @@ static int damos_commit(struct damos *ds
 	dst->wmarks = src->wmarks;
 	dst->target_nid = src->target_nid;
 
+	err = damos_commit_dests(dst, src);
+	if (err)
+		return err;
+
 	err = damos_commit_filters(dst, src);
 	return err;
 }
_

Patches currently in -mm which might be from bijantabatab@micron.com are

mm-damon-core-commit-damos-target_nid.patch
mm-damon-core-commit-damos-migrate_dests.patch
mm-damon-move-migration-helpers-from-paddr-to-ops-common.patch
mm-damon-vaddr-add-vaddr-versions-of-migrate_hotcold.patch
docs-mm-damon-design-document-vaddr-support-for-migrate_hotcold.patch
mm-damon-vaddr-use-damos-migrate_dests-in-migrate_hotcold.patch
mm-damon-move-folio-filtering-from-paddr-to-ops-common.patch
mm-damon-vaddr-apply-filters-in-migrate_hot-cold.patch