x86/apic: Move logical APIC ID away from apic_bsp_setup()

apic_bsp_setup() sets and returns logical APIC ID for initializing
cpu0_logical_apicid in a SMP-capable system.

The id has nothing to do with the initialization of local APIC and I/O
APIC. And apic_bsp_setup() should be called for interrupt mode setup only.

Move the id setup into a separate helper function for cleanup and mark
apic_bsp_setup() void.

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: yinghai@kernel.org
Cc: bhe@redhat.com
Link: https://lkml.kernel.org/r/1505293975-26005-5-git-send-email-douly.fnst@cn.fujitsu.com

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 1a970f5..4e550c7 100644 (file)
--- 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 ad37324..eafed8f 100644 (file)
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2379,25 +2379,17 @@ 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 dad0a09..d367ddb 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1294,6 +1294,14 @@ static void __init smp_cpu_index_default(void)
        }
 }
 
+static void __init smp_get_logical_apicid(void)
+{
+       if (x2apic_mode)
+               cpu0_logical_apicid = apic_read(APIC_LDR);
+       else
+               cpu0_logical_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
+}
+
 /*
  * Prepare for SMP bootup.  The MP table or ACPI has been read
  * earlier.  Just do some sanity checking here and enable APIC mode.
@@ -1354,11 +1362,13 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
        }
 
        default_setup_apic_routing();
-       cpu0_logical_apicid = apic_bsp_setup(false);
+       apic_bsp_setup(false);
 
        /* Setup local timer */
        x86_init.timers.setup_percpu_clockev();
 
+       smp_get_logical_apicid();
+
        pr_info("CPU0: ");
        print_cpu_info(&cpu_data(0));