linux-kernel - [PATCH] time/sched_clock: Use ACCESS_PRIVATE() to evaluate hrtimer::function

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Message-ID: <87jyxlk3w4.ffs@tglx>
Date: Tue, 13 Jan 2026 15:01:47 +0100
From: Thomas Gleixner <tglx@...nel.org>
To: kernel test robot <lkp@...el.com>, Nam Cao <namcao@...utronix.de>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org, Ingo Molnar
 <mingo@...nel.org>
Subject: [PATCH] time/sched_clock: Use ACCESS_PRIVATE() to evaluate
 hrtimer::function

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@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...nel.org>
Closes: https://lore.kernel.org/oe-kbuild-all/202601131713.KsxhXQ0M-lkp@intel.com/
---
 kernel/time/sched_clock.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -215,7 +215,7 @@ void sched_clock_register(u64 (*read)(vo
 
 	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);