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ARM: smp: Switch to hotplug core state synchronization

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Switch to the CPU hotplug core state tracking and synchronization
mechanim. No functional change intended.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Tested-by: Helge Deller <deller@gmx.de> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@igalia.com> # Steam Deck
Link: https://lore.kernel.org/r/20230512205256.635326070@linutronix.de
This commit is contained in:
Thomas Gleixner 2023-05-12 23:07:32 +02:00 committed by Peter Zijlstra
parent 5356297d12
commit 5490e769cd
3 changed files with 9 additions and 12 deletions
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1
arch/arm/Kconfig
View File

@ -124,6 +124,7 @@ config ARM
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UID16
select HAVE_VIRT_CPU_ACCOUNTING_GEN
select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
select IRQ_FORCED_THREADING
select MODULES_USE_ELF_REL
select NEED_DMA_MAP_STATE

2
arch/arm/include/asm/smp.h
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@ -64,7 +64,7 @@ extern void secondary_startup_arm(void);
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
static inline void __cpu_die(unsigned int cpu) { }
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);

18
arch/arm/kernel/smp.c
View File

@ -288,15 +288,11 @@ int __cpu_disable(void)
}
/*
* called on the thread which is asking for a CPU to be shutdown -
* waits until shutdown has completed, or it is timed out.
* called on the thread which is asking for a CPU to be shutdown after the
* shutdown completed.
*/
void __cpu_die(unsigned int cpu)
void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)
{
if (!cpu_wait_death(cpu, 5)) {
pr_err("CPU%u: cpu didn't die\n", cpu);
return;
}
pr_debug("CPU%u: shutdown\n", cpu);
clear_tasks_mm_cpumask(cpu);
@ -336,11 +332,11 @@ void __noreturn arch_cpu_idle_dead(void)
flush_cache_louis();
/*
* Tell __cpu_die() that this CPU is now safe to dispose of. Once
* this returns, power and/or clocks can be removed at any point
* from this CPU and its cache by platform_cpu_kill().
* Tell cpuhp_bp_sync_dead() that this CPU is now safe to dispose
* of. Once this returns, power and/or clocks can be removed at
* any point from this CPU and its cache by platform_cpu_kill().
*/
(void)cpu_report_death();
cpuhp_ap_report_dead();
/*
* Ensure that the cache lines associated with that completion are