linux-kernel - [tip: smp/core] parisc: Switch to hotplug core state synchronization

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Message-ID: <168422819654.404.3463481491264474300.tip-bot2@tip-bot2>
Date:   Tue, 16 May 2023 09:09:56 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Helge Deller <deller@....de>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: smp/core] parisc: Switch to hotplug core state synchronization

The following commit has been merged into the smp/core branch of tip:

Commit-ID:     51e0efe1f26ec900ad80025b9faa2bec9575f1b2
Gitweb:        https://git.kernel.org/tip/51e0efe1f26ec900ad80025b9faa2bec9575f1b2
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Fri, 12 May 2023 23:07:38 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 15 May 2023 13:44:59 +02:00

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: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Tested-by: Michael Kelley <mikelley@...rosoft.com>
Tested-by: Oleksandr Natalenko <oleksandr@...alenko.name>
Tested-by: Helge Deller <deller@....de> # parisc
Tested-by: Guilherme G. Piccoli <gpiccoli@...lia.com> # Steam Deck
Link: https://lore.kernel.org/r/20230512205256.859920443@linutronix.de
---
 arch/parisc/Kconfig          | 1 +
 arch/parisc/kernel/process.c | 4 ++--
 arch/parisc/kernel/smp.c     | 7 +++----
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 466a255..67a3f98 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -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
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 97c6f87..66f6543 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -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();
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index b7fc859..6b6eaa4 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -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 */