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Subject[PATCH v9 04/12] x86/apic: Move logical APIC ID away from apic_bsp_setup()
Date
apic_bsp_setup() sets and returns logical APIC ID for initializing
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() should be called for interrupt mode
setup intently.

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>
---
arch/x86/include/asm/apic.h | 2 +-
arch/x86/kernel/apic/apic.c | 10 +---------
arch/x86/kernel/smpboot.c | 12 +++++++++++-
3 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 1a970f5..4e550c7 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 ad37324..eafed8f 100644
--- 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 dde8f1c..82f2e79 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1291,6 +1291,14 @@ 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.
@@ -1351,11 +1359,13 @@ 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));

--
2.5.5


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