linux-kernel - [RFC PATCH v3 07/12] x86/apic: Move the logical APIC ID setup from apic_bsp

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1494423889-25799-8-git-send-email-douly.fnst@cn.fujitsu.com>
Date:   Wed, 10 May 2017 21:44:44 +0800
From:   Dou Liyang <douly.fnst@...fujitsu.com>
To:     <x86@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     <tglx@...utronix.de>, <mingo@...nel.org>, <hpa@...or.com>,
        <ebiederm@...ssion.com>, <bhe@...hat.com>,
        <izumi.taku@...fujitsu.com>, Dou Liyang <douly.fnst@...fujitsu.com>
Subject: [RFC PATCH v3 07/12] x86/apic: Move the logical APIC ID setup from apic_bsp_setup()

The apic_bsp_setup() sets and returns logical APIC ID for setting up
cpu0_logical_apicid in SMP-capable system.

The id has nothing to do with the initialization of local APIC and
I/O APIC. And apic_bsp_setup() will be called earlier.

Move the id setup to native_smp_prepare_cpus() for cleanup.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
 arch/x86/include/asm/apic.h |  2 +-
 arch/x86/kernel/apic/apic.c | 10 +---------
 arch/x86/kernel/smpboot.c   |  4 ++++
 3 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index e9502e6..13f46e3 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -146,7 +146,7 @@ static inline int apic_force_enable(unsigned long addr)
 extern int apic_force_enable(unsigned long addr);
 #endif
 
-extern int apic_bsp_setup(bool upmode);
+extern void apic_bsp_setup(bool upmode);
 extern void apic_ap_setup(void);
 
 /*
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 5f40d4a..614ee6b 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2339,25 +2339,17 @@ static void __init apic_bsp_up_setup(void)
  * Returns:
  * apic_id of BSP APIC
  */
-int __init apic_bsp_setup(bool upmode)
+void __init apic_bsp_setup(bool upmode)
 {
-	int id;
-
 	connect_bsp_APIC();
 	if (upmode)
 		apic_bsp_up_setup();
 	setup_local_APIC();
 
-	if (x2apic_mode)
-		id = apic_read(APIC_LDR);
-	else
-		id = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
-
 	enable_IO_APIC();
 	end_local_APIC_setup();
 	irq_remap_enable_fault_handling();
 	setup_IO_APIC();
-	return id;
 }
 
 /*
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index e44f957..4e706e7 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1347,6 +1347,10 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 	default_setup_apic_routing();
 	cpu0_logical_apicid = apic_bsp_setup(false);
 
+	if (x2apic_mode)
+		cpu0_logical_apicid = apic_read(APIC_LDR);
+	else
+		cpu0_logical_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
 
 	/* Setup local timer */
 	x86_init.timers.setup_percpu_clockev();
-- 
2.5.5