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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/kernel/cgroup/cgroup.c
..
..
@@ -56,6 +56,7 @@
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 #include <linux/file.h>
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 #include <linux/fs_parser.h>
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 #include <linux/sched/cputime.h>
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+#include <linux/sched/deadline.h>
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 #include <linux/psi.h>
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 #include <net/sock.h>
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62
 
..
..
@@ -1736,7 +1737,7 @@
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 {
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 	struct cgroup *dcgrp = &dst_root->cgrp;
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 	struct cgroup_subsys *ss;
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-	int ssid, i, ret;
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+	int ssid, ret;
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 	u16 dfl_disable_ss_mask = 0;
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 	lockdep_assert_held(&cgroup_mutex);
..
..
@@ -1780,7 +1781,8 @@
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 		struct cgroup_root *src_root = ss->root;
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 		struct cgroup *scgrp = &src_root->cgrp;
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 		struct cgroup_subsys_state *css = cgroup_css(scgrp, ss);
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-		struct css_set *cset;
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+		struct css_set *cset, *cset_pos;
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+		struct css_task_iter *it;
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 		WARN_ON(!css || cgroup_css(dcgrp, ss));
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..
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@@ -1798,9 +1800,22 @@
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 		css->cgroup = dcgrp;
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 		spin_lock_irq(&css_set_lock);
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-		hash_for_each(css_set_table, i, cset, hlist)
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+		WARN_ON(!list_empty(&dcgrp->e_csets[ss->id]));
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+		list_for_each_entry_safe(cset, cset_pos, &scgrp->e_csets[ss->id],
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+					 e_cset_node[ss->id]) {
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 			list_move_tail(&cset->e_cset_node[ss->id],
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 				       &dcgrp->e_csets[ss->id]);
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+			/*
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+			 * all css_sets of scgrp together in same order to dcgrp,
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+			 * patch in-flight iterators to preserve correct iteration.
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+			 * since the iterator is always advanced right away and
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+			 * finished when it->cset_pos meets it->cset_head, so only
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+			 * update it->cset_head is enough here.
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+			 */
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+			list_for_each_entry(it, &cset->task_iters, iters_node)
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+				if (it->cset_head == &scgrp->e_csets[ss->id])
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+					it->cset_head = &dcgrp->e_csets[ss->id];
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+		}
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 		spin_unlock_irq(&css_set_lock);
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1820
 
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 		/* default hierarchy doesn't enable controllers by default */
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@@ -4219,6 +4234,7 @@
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 		cft->flags |= __CFTYPE_ONLY_ON_DFL;
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 	return cgroup_add_cftypes(ss, cfts);
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 }
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+EXPORT_SYMBOL_GPL(cgroup_add_dfl_cftypes);
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 /**
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  * cgroup_add_legacy_cftypes - add an array of cftypes for legacy hierarchies
..
..
@@ -6197,19 +6213,18 @@
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 static void cgroup_css_set_put_fork(struct kernel_clone_args *kargs)
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 	__releases(&cgroup_threadgroup_rwsem) __releases(&cgroup_mutex)
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 {
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+	struct cgroup *cgrp = kargs->cgrp;
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+	struct css_set *cset = kargs->cset;
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+
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 	cgroup_threadgroup_change_end(current);
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6220
 
6221
+	if (cset) {
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+		put_css_set(cset);
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+		kargs->cset = NULL;
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+	}
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+
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 	if (kargs->flags & CLONE_INTO_CGROUP) {
6203
-		struct cgroup *cgrp = kargs->cgrp;
6204
-		struct css_set *cset = kargs->cset;
6205
-
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 		mutex_unlock(&cgroup_mutex);
6207
-
6208
-		if (cset) {
6209
-			put_css_set(cset);
6210
-			kargs->cset = NULL;
6211
-		}
6212
-
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6228
 		if (cgrp) {
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6229
 			cgroup_put(cgrp);
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 			kargs->cgrp = NULL;
..
..
@@ -6372,6 +6387,9 @@
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 	list_add_tail(&tsk->cg_list, &cset->dying_tasks);
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 	cset->nr_tasks--;
6374
6389
 
6390
+	if (dl_task(tsk))
6391
+		dec_dl_tasks_cs(tsk);
6392
+
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 	WARN_ON_ONCE(cgroup_task_frozen(tsk));
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 	if (unlikely(cgroup_task_freeze(tsk)))
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 		cgroup_update_frozen(task_dfl_cgroup(tsk));