Commit 51e0efe1 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Peter Zijlstra
Browse files

parisc: Switch to hotplug core state synchronization 



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

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: default avatarMichael Kelley <mikelley@microsoft.com>
Tested-by: default avatarOleksandr 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/20230512205256.859920443@linutronix.de
parent c8d2bcc4

arch/parisc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ config PARISC 
	select HAVE_ARCH_SECCOMP_FILTER

	select HAVE_ARCH_TRACEHOOK

	select HAVE_REGS_AND_STACK_ACCESS_API

	select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU

	select GENERIC_SCHED_CLOCK

	select GENERIC_IRQ_MIGRATION if SMP

	select HAVE_UNSTABLE_SCHED_CLOCK if SMP

arch/parisc/kernel/process.c

+2 −2
Original line number Diff line number Diff line
@@ -166,8 +166,8 @@ void __noreturn arch_cpu_idle_dead(void) 


	local_irq_disable();



	/* Tell __cpu_die() that this CPU is now safe to dispose of. */

	(void)cpu_report_death();

	/* Tell the core that this CPU is now safe to dispose of. */

	cpuhp_ap_report_dead();



	/* Ensure that the cache lines are written out. */

	flush_cache_all_local();

arch/parisc/kernel/smp.c

+3 −4
Original line number Diff line number Diff line
@@ -500,11 +500,10 @@ int __cpu_disable(void) 
void __cpu_die(unsigned int cpu)

{

	pdc_cpu_rendezvous_lock();



	if (!cpu_wait_death(cpu, 5)) {

		pr_crit("CPU%u: cpu didn't die\n", cpu);

		return;

}



void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)

{

	pr_info("CPU%u: is shutting down\n", cpu);



	/* set task's state to interruptible sleep */