[tip: timers/core] timers/migration: Simplify top level detection on group setup

["tip-bot2 for Frederic Weisbecker" <tip-bot2@linutronix.de>]

The following commit has been merged into the timers/core branch of tip:

Commit-ID:     dcf6230555dcd0b05e8d2dd5b128dcc4b6fc04ef
Gitweb:        https://git.kernel.org/tip/dcf6230555dcd0b05e8d2dd5b128dcc4b6fc04ef
Author:        Frederic Weisbecker <frederic@kernel.org>
AuthorDate:    Wed, 15 Jan 2025 00:15:07 +01:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Thu, 16 Jan 2025 14:01:09 +01:00

timers/migration: Simplify top level detection on group setup

Having a single group on a given level is enough to know this is the
top level, because a root has to have at least two children, unless that
root is the only group and the children are actual CPUs.

Simplify the test in tmigr_setup_groups() accordingly.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250114231507.21672-5-frederic@kernel.org

---
 kernel/time/timer_migration.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/time/timer_migration.c b/kernel/time/timer_migration.c
index 8d57f76..6163376 100644
--- a/kernel/time/timer_migration.c
+++ b/kernel/time/timer_migration.c
@@ -1624,9 +1624,7 @@ static int tmigr_setup_groups(unsigned int cpu, unsigned int node)
 		 * be different from tmigr_hierarchy_levels, contains only a
 		 * single group.
 		 */
-		if (group->parent || i == tmigr_hierarchy_levels ||
-		    (list_empty(&tmigr_level_list[i]) &&
-		     list_is_singular(&tmigr_level_list[i - 1])))
+		if (group->parent || list_is_singular(&tmigr_level_list[i - 1]))
 			break;
 
 	} while (i < tmigr_hierarchy_levels);