linux-kernel - [PATCH v8 03/13] x86/apic: Split local APIC timer setup from the APIC setup

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Date:   Mon, 28 Aug 2017 11:20:28 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <tglx@...utronix.de>
CC:     <mingo@...nel.org>, <hpa@...or.com>, <bhe@...hat.com>,
        <rjw@...ysocki.net>, <bp@...en8.de>, <indou.takao@...fujitsu.com>,
        <izumi.taku@...fujitsu.com>, Dou Liyang <douly.fnst@...fujitsu.com>
Subject: [PATCH v8 03/13] x86/apic: Split local APIC timer setup from the APIC setup

apic_bsp_setup() sets up the local APIC, I/O APIC and APIC timer.

The local APIC and I/O APIC setup belongs to interrupt delivery mode
setup. Setting up the local APIC timer for booting CPU is another job
and has nothing to do with interrupt delivery mode setup.

Split local APIC timer setup from the APIC setup, keep it in the
original position for SMP and UP kernel for preparation.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
 arch/x86/kernel/apic/apic.c | 4 ++--
 arch/x86/kernel/smpboot.c   | 5 +++++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 809625d..80a273d 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2444,8 +2444,6 @@ int __init apic_bsp_setup(bool upmode)
 	end_local_APIC_setup();
 	irq_remap_enable_fault_handling();
 	setup_IO_APIC();
-	/* Setup local timer */
-	x86_init.timers.setup_percpu_clockev();
 	return id;
 }
 
@@ -2485,6 +2483,8 @@ int __init APIC_init_uniprocessor(void)
 
 	default_setup_apic_routing();
 	apic_bsp_setup(true);
+	/* Setup local timer */
+	x86_init.timers.setup_percpu_clockev();
 	return 0;
 }
 
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 54b9e89..394cd81 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1337,6 +1337,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 	case SMP_FORCE_UP:
 		disable_smp();
 		apic_bsp_setup(false);
+		/* Setup local timer */
+		x86_init.timers.setup_percpu_clockev();
 		return;
 	case SMP_OK:
 		break;
@@ -1351,6 +1353,9 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 	default_setup_apic_routing();
 	cpu0_logical_apicid = apic_bsp_setup(false);
 
+	/* Setup local timer */
+	x86_init.timers.setup_percpu_clockev();
+
 	pr_info("CPU0: ");
 	print_cpu_info(&cpu_data(0));
 
-- 
2.5.5