The following commit has been merged into the smp/core branch of tip:
Commit-ID: bc088f9a0d5bdf12bb18980739336dfcc092e55b
Gitweb: https://git.kernel.org/tip/bc088f9a0d5bdf12bb18980739336dfcc092e55b
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Fri, 12 May 2023 23:07:41 +02:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 15 May 2023 13:45:00 +02:00
cpu/hotplug: Remove unused state functions
All users converted to the hotplug core mechanism.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
Tested-by: Oleksandr Natalenko <oleksandr@xxxxxxxxxxxxxx>
Tested-by: Helge Deller <deller@xxxxxx> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxx> # Steam Deck
Link: https://lore.kernel.org/r/20230512205256.972894276@xxxxxxxxxxxxx
---
include/linux/cpu.h | 2 +-
kernel/smpboot.c | 75 +--------------------------------------------
2 files changed, 77 deletions(-)
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 68f69e8..d321dbd 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -193,8 +193,6 @@ static inline void play_idle(unsigned long duration_us)
}
#ifdef CONFIG_HOTPLUG_CPU
-bool cpu_wait_death(unsigned int cpu, int seconds);
-bool cpu_report_death(void);
void cpuhp_report_idle_dead(void);
#else
static inline void cpuhp_report_idle_dead(void) { }
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index 1940f33..f47d8f3 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -325,78 +325,3 @@ void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread)
cpus_read_unlock();
}
EXPORT_SYMBOL_GPL(smpboot_unregister_percpu_thread);
-
-#ifndef CONFIG_HOTPLUG_CORE_SYNC
-static DEFINE_PER_CPU(atomic_t, cpu_hotplug_state) = ATOMIC_INIT(CPU_POST_DEAD);
-
-#ifdef CONFIG_HOTPLUG_CPU
-/*
- * Wait for the specified CPU to exit the idle loop and die.
- */
-bool cpu_wait_death(unsigned int cpu, int seconds)
-{
- int jf_left = seconds * HZ;
- int oldstate;
- bool ret = true;
- int sleep_jf = 1;
-
- might_sleep();
-
- /* The outgoing CPU will normally get done quite quickly. */
- if (atomic_read(&per_cpu(cpu_hotplug_state, cpu)) == CPU_DEAD)
- goto update_state_early;
- udelay(5);
-
- /* But if the outgoing CPU dawdles, wait increasingly long times. */
- while (atomic_read(&per_cpu(cpu_hotplug_state, cpu)) != CPU_DEAD) {
- schedule_timeout_uninterruptible(sleep_jf);
- jf_left -= sleep_jf;
- if (jf_left <= 0)
- break;
- sleep_jf = DIV_ROUND_UP(sleep_jf * 11, 10);
- }
-update_state_early:
- oldstate = atomic_read(&per_cpu(cpu_hotplug_state, cpu));
-update_state:
- if (oldstate == CPU_DEAD) {
- /* Outgoing CPU died normally, update state. */
- smp_mb(); /* atomic_read() before update. */
- atomic_set(&per_cpu(cpu_hotplug_state, cpu), CPU_POST_DEAD);
- } else {
- /* Outgoing CPU still hasn't died, set state accordingly. */
- if (!atomic_try_cmpxchg(&per_cpu(cpu_hotplug_state, cpu),
- &oldstate, CPU_BROKEN))
- goto update_state;
- ret = false;
- }
- return ret;
-}
-
-/*
- * Called by the outgoing CPU to report its successful death. Return
- * false if this report follows the surviving CPU's timing out.
- *
- * A separate "CPU_DEAD_FROZEN" is used when the surviving CPU
- * timed out. This approach allows architectures to omit calls to
- * cpu_check_up_prepare() and cpu_set_state_online() without defeating
- * the next cpu_wait_death()'s polling loop.
- */
-bool cpu_report_death(void)
-{
- int oldstate;
- int newstate;
- int cpu = smp_processor_id();
-
- oldstate = atomic_read(&per_cpu(cpu_hotplug_state, cpu));
- do {
- if (oldstate != CPU_BROKEN)
- newstate = CPU_DEAD;
- else
- newstate = CPU_DEAD_FROZEN;
- } while (!atomic_try_cmpxchg(&per_cpu(cpu_hotplug_state, cpu),
- &oldstate, newstate));
- return newstate == CPU_DEAD;
-}
-
-#endif /* #ifdef CONFIG_HOTPLUG_CPU */
-#endif /* !CONFIG_HOTPLUG_CORE_SYNC */
|