From 36b9017f0250a5299bb715b3b8c41b5e2b05b320 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sun, 23 Jun 2019 15:23:41 +0200 Subject: [PATCH] x86/hpet: Simplify CPU online code The indirection via work scheduled on the upcoming CPU was necessary with the old hotplug code because the online callback was invoked on the control CPU not on the upcoming CPU. The rework of the CPU hotplug core guarantees that the online callbacks are invoked on the upcoming CPU. Remove the now pointless work redirection. Signed-off-by: Thomas Gleixner Reviewed-by: Ingo Molnar Cc: Peter Zijlstra Cc: Ricardo Neri Cc: Ashok Raj Cc: Andi Kleen Cc: Suravee Suthikulpanit Cc: Stephane Eranian Cc: Ravi Shankar Link: https://lkml.kernel.org/r/20190623132434.047254075@linutronix.de --- arch/x86/kernel/hpet.c | 31 ++----------------------------- 1 file changed, 2 insertions(+), 29 deletions(-) diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index a0573f2..a6aa226 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -547,12 +547,10 @@ static int hpet_setup_irq(struct hpet_dev *dev) return 0; } -/* This should be called in specific @cpu */ static void init_one_hpet_msi_clockevent(struct hpet_dev *hdev, int cpu) { struct clock_event_device *evt = &hdev->evt; - WARN_ON(cpu != smp_processor_id()); if (!(hdev->flags & HPET_DEV_VALID)) return; @@ -684,36 +682,12 @@ static struct hpet_dev *hpet_get_unused_timer(void) return NULL; } -struct hpet_work_struct { - struct delayed_work work; - struct completion complete; -}; - -static void hpet_work(struct work_struct *w) +static int hpet_cpuhp_online(unsigned int cpu) { - struct hpet_dev *hdev; - int cpu = smp_processor_id(); - struct hpet_work_struct *hpet_work; + struct hpet_dev *hdev = hpet_get_unused_timer(); - hpet_work = container_of(w, struct hpet_work_struct, work.work); - - hdev = hpet_get_unused_timer(); if (hdev) init_one_hpet_msi_clockevent(hdev, cpu); - - complete(&hpet_work->complete); -} - -static int hpet_cpuhp_online(unsigned int cpu) -{ - struct hpet_work_struct work; - - INIT_DELAYED_WORK_ONSTACK(&work.work, hpet_work); - init_completion(&work.complete); - /* FIXME: add schedule_work_on() */ - schedule_delayed_work_on(cpu, &work.work, 0); - wait_for_completion(&work.complete); - destroy_delayed_work_on_stack(&work.work); return 0; } @@ -1045,7 +1019,6 @@ static __init int hpet_late_init(void) if (boot_cpu_has(X86_FEATURE_ARAT)) return 0; - /* This notifier should be called after workqueue is ready */ ret = cpuhp_setup_state(CPUHP_AP_X86_HPET_ONLINE, "x86/hpet:online", hpet_cpuhp_online, NULL); if (ret) -- 2.7.4