[PATCH 6.19 077/781] time/sched_clock: Use ACCESS_PRIVATE() to evaluate hrtimer::function

Greg Kroah-Hartman
2026-02-25T01:28:12Z

From: Thomas Gleixner <tglx@kernel.org>

[ Upstream commit 3db5306b0bd562ac0fe7eddad26c60ebb6f5fdd4 ]

This dereference of sched_clock_timer::function was missed when the
hrtimer callback function pointer was marked private.

Fixes: 04257da0c99c ("hrtimers: Make callback function pointer private")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/875x95jw7q.ffs@tglx
Closes: https://lore.kernel.org/oe-kbuild-all/202601131713.KsxhXQ0M-lkp@intel.com/
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/time/sched_clock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index f39111830ca36..f3aaef695b8cd 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -215,7 +215,7 @@ void sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)

update_clock_read_data(&rd);

- if (sched_clock_timer.function != NULL) {
+ if (ACCESS_PRIVATE(&sched_clock_timer, function) != NULL) {
/* update timeout for clock wrap */
hrtimer_start(&sched_clock_timer, cd.wrap_kt,
HRTIMER_MODE_REL_HARD);
--
2.51.0