iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
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
This commit is contained in:
Dou Liyang 2017-09-13 17:12:47 +08:00 committed by Thomas Gleixner
parent a2510d156e
commit 4b1244b45c
3 changed files with 13 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/apic.h
View File

@ -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);
/*

10
arch/x86/kernel/apic/apic.c
View File

@ -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;
}
/*

12
arch/x86/kernel/smpboot.c
View File

@ -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));