Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761580AbdDSJGe (ORCPT ); Wed, 19 Apr 2017 05:06:34 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:25774 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1761545AbdDSJG2 (ORCPT ); Wed, 19 Apr 2017 05:06:28 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="17913947" From: Dou Liyang To: , CC: , , , , , , Dou Liyang Subject: [RFC PATCH v2 11/12] x86/apic: Mark the apic_interrupt_mode extern for refining code Date: Wed, 19 Apr 2017 17:05:25 +0800 Message-ID: X-Mailer: git-send-email 2.5.5 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.167.226.106] X-yoursite-MailScanner-ID: B3DA247CE24C.A4CEE X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: douly.fnst@cn.fujitsu.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4160 Lines: 155 Native_smp_prepare_cpus() prepares for SMP bootup, does some sanity checking and enables APIC mode. The APIC mode setup has been unified to init_interrupt_mode(), Here is redundant and need to be cleaned up. Mark the apic_interrupt_mode extern to refine the switch and remove the redundant sanity check. Signed-off-by: Dou Liyang --- arch/x86/include/asm/apic.h | 9 +++++++++ arch/x86/kernel/apic/apic.c | 12 +++--------- arch/x86/kernel/smpboot.c | 48 +++++++-------------------------------------- 3 files changed, 19 insertions(+), 50 deletions(-) diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 9f2bc9c..b0b2cf0 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -53,6 +53,15 @@ extern int local_apic_timer_c2_ok; extern int disable_apic; extern unsigned int lapic_timer_frequency; +extern enum apic_interrupt_mode_id apic_interrupt_mode; +enum apic_interrupt_mode_id { + APIC_PIC = 0, + APIC_VIRTUAL_WIRE, + APIC_SYMMETRIC_IO, + APIC_SYMMETRIC_IO_NO_CONFIG, + APIC_SYMMETRIC_IO_NO_ROUTING +}; + #ifdef CONFIG_SMP extern void __inquire_remote_apic(int apicid); #else /* CONFIG_SMP */ diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 5d27a24..f259daa 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1153,14 +1153,7 @@ void __init sync_Arb_IDs(void) APIC_INT_LEVELTRIG | APIC_DM_INIT); } -enum apic_interrupt_mode { - APIC_PIC = 0, - APIC_VIRTUAL_WIRE, - APIC_SYMMETRIC_IO, - APIC_SYMMETRIC_IO_NO_CONFIG, - APIC_SYMMETRIC_IO_NO_ROUTING, - APIC_MODE_COUNT -}; +enum apic_interrupt_mode_id apic_interrupt_mode; static int __init apic_bsp_mode_check(int *upmode) { @@ -1286,7 +1279,8 @@ void __init init_interrupt_mode(void) { int upmode = false; - switch (apic_bsp_mode_check(&upmode)) { + apic_interrupt_mode = apic_bsp_mode_check(&upmode); + switch (apic_interrupt_mode) { case APIC_PIC: pr_info("Keep in PIC mode(8259)\n"); return; diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 19d36ca..e2de8e8 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1193,7 +1193,7 @@ enum { /* * Various sanity checks. */ -static int __init smp_sanity_check(unsigned max_cpus) +static void __init smp_sanity_check(void) { preempt_disable(); @@ -1231,16 +1231,6 @@ static int __init smp_sanity_check(unsigned max_cpus) } /* - * If we couldn't find an SMP configuration at boot time, - * get out of here now! - */ - if (!smp_found_config && !acpi_lapic) { - preempt_enable(); - pr_notice("SMP motherboard not detected\n"); - return SMP_NO_CONFIG; - } - - /* * Should not be necessary because the MP table should list the boot * CPU too, but we do it for the sake of robustness anyway. */ @@ -1250,29 +1240,6 @@ static int __init smp_sanity_check(unsigned max_cpus) physid_set(hard_smp_processor_id(), phys_cpu_present_map); } preempt_enable(); - - /* - * If we couldn't find a local APIC, then get out of here now! - */ - if (APIC_INTEGRATED(boot_cpu_apic_version) && - !boot_cpu_has(X86_FEATURE_APIC)) { - if (!disable_apic) { - pr_err("BIOS bug, local APIC #%d not detected!...\n", - boot_cpu_physical_apicid); - pr_err("... forcing use of dummy APIC emulation (tell your hw vendor)\n"); - } - return SMP_NO_APIC; - } - - /* - * If SMP should be disabled, then really disable it! - */ - if (!max_cpus) { - pr_info("SMP mode deactivated\n"); - return SMP_FORCE_UP; - } - - return SMP_OK; } static void __init smp_cpu_index_default(void) @@ -1320,18 +1287,17 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus) set_sched_topology(x86_topology); set_cpu_sibling_map(0); + smp_sanity_check(); - switch (smp_sanity_check(max_cpus)) { - case SMP_NO_CONFIG: - disable_smp(); - return; - case SMP_NO_APIC: + switch (apic_interrupt_mode) { + case APIC_PIC: disable_smp(); return; - case SMP_FORCE_UP: + case APIC_SYMMETRIC_IO_NO_CONFIG: disable_smp(); + x86_init.timers.setup_percpu_clockev(); return; - case SMP_OK: + default: break; } -- 2.5.5