hrtimers: Handle CPU state correctly on hotplug

commit 2f8dea1692eef2b7ba6a256246ed82c365fdc686 upstream.

Consider a scenario where a CPU transitions from CPUHP_ONLINE to halfway
through a CPU hotunplug down to CPUHP_HRTIMERS_PREPARE, and then back to
CPUHP_ONLINE:

Since hrtimers_prepare_cpu() does not run, cpu_base.hres_active remains set
to 1 throughout. However, during a CPU unplug operation, the tick and the
clockevents are shut down at CPUHP_AP_TICK_DYING. On return to the online
state, for instance CFS incorrectly assumes that the hrtick is already
active, and the chance of the clockevent device to transition to oneshot
mode is also lost forever for the CPU, unless it goes back to a lower state
than CPUHP_HRTIMERS_PREPARE once.

This round-trip reveals another issue; cpu_base.online is not set to 1
after the transition, which appears as a WARN_ON_ONCE in enqueue_hrtimer().

Aside of that, the bulk of the per CPU state is not reset either, which
means there are dangling pointers in the worst case.

Address this by adding a corresponding startup() callback, which resets the
stale per CPU state and sets the online flag.

[ tglx: Make the new callback unconditionally available, remove the online
  	modification in the prepare() callback and clear the remaining
  	state in the starting callback instead of the prepare callback ]

Fixes: 5c0930ccaad5 ("hrtimers: Push pending hrtimers away from outgoing CPU earlier")
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20241220134421.3809834-1-koichiro.den@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 254d4a898179c0ad9c3a4b41a07b8e2ed9b1741b..8f77bb0f4ae0ca4de04ec21e6454e1b0a6fe4f7c 100644 (file)
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -532,6 +532,7 @@ extern void __init hrtimers_init(void);
 extern void sysrq_timer_list_show(void);
 
 int hrtimers_prepare_cpu(unsigned int cpu);
+int hrtimers_cpu_starting(unsigned int cpu);
 #ifdef CONFIG_HOTPLUG_CPU
 int hrtimers_cpu_dying(unsigned int cpu);
 #else

diff --git a/kernel/cpu.c b/kernel/cpu.c
index acf16e3426518230760b24500edf839ed1493b6d..eac96f4424e34ffc2610aa123e14372bf814cd9a 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -1766,7 +1766,7 @@ static struct cpuhp_step cpuhp_hp_states[] = {
        },
        [CPUHP_AP_HRTIMERS_DYING] = {
                .name                   = "hrtimers:dying",
-               .startup.single         = NULL,
+               .startup.single         = hrtimers_cpu_starting,
                .teardown.single        = hrtimers_cpu_dying,
        },
 

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index bdd9041d595e9755cd0fe101ef65a94bdfcb1595..9e91f69012a7373931a6c3e978d59d07794f42b2 100644 (file)
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -2176,6 +2176,15 @@ int hrtimers_prepare_cpu(unsigned int cpu)
        }
 
        cpu_base->cpu = cpu;
+       hrtimer_cpu_base_init_expiry_lock(cpu_base);
+       return 0;
+}
+
+int hrtimers_cpu_starting(unsigned int cpu)
+{
+       struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
+
+       /* Clear out any left over state from a CPU down operation */
        cpu_base->active_bases = 0;
        cpu_base->hres_active = 0;
        cpu_base->hang_detected = 0;
@@ -2184,7 +2193,6 @@ int hrtimers_prepare_cpu(unsigned int cpu)
        cpu_base->expires_next = KTIME_MAX;
        cpu_base->softirq_expires_next = KTIME_MAX;
        cpu_base->online = 1;
-       hrtimer_cpu_base_init_expiry_lock(cpu_base);
        return 0;
 }
 
@@ -2262,6 +2270,7 @@ int hrtimers_cpu_dying(unsigned int dying_cpu)
 void __init hrtimers_init(void)
 {
        hrtimers_prepare_cpu(smp_processor_id());
+       hrtimers_cpu_starting(smp_processor_id());
        open_softirq(HRTIMER_SOFTIRQ, hrtimer_run_softirq);
 }