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x86/smpboot: Cleanup ioapic handling

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smpboot is very creative with the ways to disable ioapic.

smpboot_clear_io_apic() smpboot_clear_io_apic_irqs() and
disable_ioapic_support() serve a similar purpose.

smpboot_clear_io_apic_irqs() is the most useless of all
functions as it clears a variable which has not been setup yet.

Aside of that it has the same ifdef mess and conditionals around the
ioapic related code, which can now be removed.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/20150115211703.650280684@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2015-01-15 21:22:35 +00:00
parent 35e4c6d30e
commit ef4c59a4b6
1 changed files with 7 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
arch/x86/kernel/smpboot.c
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@ -103,13 +103,6 @@ EXPORT_PER_CPU_SYMBOL(cpu_info);
atomic_t init_deasserted;
static inline void smpboot_clear_io_apic_irqs(void)
{
#ifdef CONFIG_X86_IO_APIC
io_apic_irqs = 0;
#endif
}
static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
{
unsigned long flags;
@ -147,27 +140,6 @@ static inline void smpboot_restore_warm_reset_vector(void)
*((volatile u32 *)phys_to_virt(TRAMPOLINE_PHYS_LOW)) = 0;
}
static inline void __init smpboot_setup_io_apic(void)
{
#ifdef CONFIG_X86_IO_APIC
/*
* Here we can be sure that there is an IO-APIC in the system. Let's
* go and set it up:
*/
if (!skip_ioapic_setup && nr_ioapics)
setup_IO_APIC();
else
nr_ioapics = 0;
#endif
}
static inline void smpboot_clear_io_apic(void)
{
#ifdef CONFIG_X86_IO_APIC
nr_ioapics = 0;
#endif
}
/*
* Report back to the Boot Processor during boot time or to the caller processor
* during CPU online.
@ -1019,9 +991,10 @@ void arch_disable_smp_support(void)
*/
static __init void disable_smp(void)
{
disable_ioapic_support();
init_cpu_present(cpumask_of(0));
init_cpu_possible(cpumask_of(0));
smpboot_clear_io_apic_irqs();
if (smp_found_config)
physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
@ -1105,7 +1078,6 @@ static int __init smp_sanity_check(unsigned max_cpus)
boot_cpu_physical_apicid);
pr_err("... forcing use of dummy APIC emulation (tell your hw vendor)\n");
}
smpboot_clear_io_apic();
disable_ioapic_support();
return -1;
}
@ -1117,7 +1089,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
*/
if (!max_cpus) {
pr_info("SMP mode deactivated\n");
smpboot_clear_io_apic();
disable_ioapic_support();
connect_bsp_APIC();
setup_local_APIC();
@ -1191,18 +1163,15 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
else
cpu0_logical_apicid = GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
/*
* Enable IO APIC before setting up error vector
*/
if (!skip_ioapic_setup && nr_ioapics)
enable_IO_APIC();
/* Enable IO APIC before setting up error vector */
enable_IO_APIC();
bsp_end_local_APIC_setup();
smpboot_setup_io_apic();
setup_IO_APIC();
/*
* Set up local APIC timer on boot CPU.
*/
pr_info("CPU%d: ", 0);
print_cpu_info(&cpu_data(0));
x86_init.timers.setup_percpu_clockev();
@ -1241,9 +1210,7 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
nmi_selftest();
impress_friends();
#ifdef CONFIG_X86_IO_APIC
setup_ioapic_dest();
#endif
mtrr_aps_init();
}