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arm64: 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: Mark Rutland <mark.rutland@arm.com>
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/20230512205256.690926018@linutronix.de
This commit is contained in:
Thomas Gleixner 2023-05-12 23:07:33 +02:00 committed by Peter Zijlstra
parent 5490e769cd
commit b3091f172f
3 changed files with 7 additions and 10 deletions
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1
arch/arm64/Kconfig
View File

@ -222,6 +222,7 @@ config ARM64
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_GENERIC_VDSO
select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
select IRQ_DOMAIN
select IRQ_FORCED_THREADING
select KASAN_VMALLOC if KASAN

2
arch/arm64/include/asm/smp.h
View File

@ -99,7 +99,7 @@ static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
extern int __cpu_disable(void);
extern void __cpu_die(unsigned int cpu);
static inline void __cpu_die(unsigned int cpu) { }
extern void __noreturn cpu_die(void);
extern void __noreturn cpu_die_early(void);

14
arch/arm64/kernel/smp.c
View File

@ -332,17 +332,13 @@ static int op_cpu_kill(unsigned int cpu)
}
/*
* 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)
{
int err;
if (!cpu_wait_death(cpu, 5)) {
pr_crit("CPU%u: cpu didn't die\n", cpu);
return;
}
pr_debug("CPU%u: shutdown\n", cpu);
/*
@ -369,8 +365,8 @@ void __noreturn cpu_die(void)
local_daif_mask();
/* Tell __cpu_die() that this CPU is now safe to dispose of */
(void)cpu_report_death();
/* Tell cpuhp_bp_sync_dead() that this CPU is now safe to dispose of */
cpuhp_ap_report_dead();
/*
* Actually shutdown the CPU. This must never fail. The specific hotplug