linux-kernel - [RFC PATCH v3 01/12] x86/apic: Replace init_bsp_APIC() with apic_virtual_wire_mode

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Date:   Wed, 10 May 2017 21:44:38 +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 01/12] x86/apic: Replace init_bsp_APIC() with apic_virtual_wire_mode_setup()

The init_bsp_APIC() sets up virtual wire mode through the local APIC.

The function name implies that the BSP's APIC will be initialized here,
which is unsuitable, while its initialization actually locates almost
at the end of start_kernel(). And the CONFIG X86_64 is also imply the
X86_LOCAL_APIC is y.

Rename it with a straightforward name, remove the redundant macros to
increase readability by adding an empty stub for X86_LOCAL_APIC = n.

Signed-off-by: Dou Liyang <douly.fnst@...fujitsu.com>
---
 arch/x86/include/asm/apic.h | 3 ++-
 arch/x86/kernel/apic/apic.c | 4 ++--
 arch/x86/kernel/irqinit.c   | 5 ++---
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index bdffcd9..4f4519b 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -127,7 +127,7 @@ extern void disconnect_bsp_APIC(int virt_wire_setup);
 extern void disable_local_APIC(void);
 extern void lapic_shutdown(void);
 extern void sync_Arb_IDs(void);
-extern void init_bsp_APIC(void);
+extern void apic_virtual_wire_mode_setup(void);
 extern void setup_local_APIC(void);
 extern void init_apic_mappings(void);
 void register_lapic_address(unsigned long address);
@@ -170,6 +170,7 @@ static inline void disable_local_APIC(void) { }
 # define setup_boot_APIC_clock x86_init_noop
 # define setup_secondary_APIC_clock x86_init_noop
 static inline void lapic_update_tsc_freq(void) { }
+static inline void apic_virtual_wire_mode_setup(void) {}
 #endif /* !CONFIG_X86_LOCAL_APIC */
 
 #ifdef CONFIG_X86_X2APIC
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 2d75faf..6bf7249 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1158,9 +1158,9 @@ void __init sync_Arb_IDs(void)
 }
 
 /*
- * An initial setup of the virtual wire mode.
+ * Setup the through-local-APIC virtual wire mode.
  */
-void __init init_bsp_APIC(void)
+void __init apic_virtual_wire_mode_setup(void)
 {
 	unsigned int value;
 
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 7468c69..e4f89b6 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -72,9 +72,8 @@ void __init init_ISA_irqs(void)
 	struct irq_chip *chip = legacy_pic->chip;
 	int i;
 
-#if defined(CONFIG_X86_64) || defined(CONFIG_X86_LOCAL_APIC)
-	init_bsp_APIC();
-#endif
+	apic_virtual_wire_mode_setup();
+
 	legacy_pic->init(0);
 
 	for (i = 0; i < nr_legacy_irqs(); i++)
-- 
2.5.5