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x86: remove additional_cpus configurability 

additional_cpus=<x> parameter is dangerous and broken: for example
if we boot additional_cpus=-2 on a stock dual-core system it will
crash the box on bootup.

So reduce the maze of code a bit by removingthe user-configurability
angle.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-10-05 17:12:36 +02:00
parent 649c6653fa
commit b807305059
2 changed files with 1 additions and 25 deletions
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18
arch/x86/Kconfig
View File

@ -1438,24 +1438,6 @@ config HOTPLUG_CPU
automatically on SMP systems. )
Say N if you want to disable CPU hotplug.
config HOTPLUG_RESTRICT_TO_BOOTUP_CPUS
def_bool n
prompt "Restrict CPU hotplugging to processors found during boot" if HOTPLUG_CPU
---help---
Say no here to use the default, which allows as many CPUs as are marked
"disabled" by ACPI or MPTABLES to be hotplugged after bootup.
Say yes if you do not want to allow CPUs to be added after booting, for
example if you only need CPU hotplugging enabled for suspend/resume.
If CPU_HOTPLUG is enabled this value may be overridden at boot time
with the "additional_cpus" kernel parameter.
config HOTPLUG_ADDITIONAL_CPUS
int
default 0 if !HOTPLUG_CPU || HOTPLUG_RESTRICT_TO_BOOTUP_CPUS
default -1
config COMPAT_VDSO
def_bool y
prompt "Compat VDSO support"

8
arch/x86/kernel/smpboot.c
View File

@ -1261,7 +1261,7 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
check_nmi_watchdog();
}
static int additional_cpus __initdata = CONFIG_HOTPLUG_ADDITIONAL_CPUS;
static int additional_cpus = -1;
/*
* cpu_possible_map should be static, it cannot change as cpu's
@ -1334,12 +1334,6 @@ static void remove_siblinginfo(int cpu)
cpu_clear(cpu, cpu_sibling_setup_map);
}
static __init int setup_additional_cpus(char *s)
{
return s && get_option(&s, &additional_cpus) ? 0 : -EINVAL;
}
early_param("additional_cpus", setup_additional_cpus);
static void __ref remove_cpu_from_maps(int cpu)
{
cpu_clear(cpu, cpu_online_map);