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x86/cpu/topology: Remove limit of CPUs due to disabled IO/APIC

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The rework of possible CPUs management erroneously disabled SMP when the
IO/APIC is disabled either by the 'noapic' command line parameter or during
IO/APIC setup. SMP is possible without IO/APIC.

Remove the ioapic_is_disabled conditions from the relevant possible CPU
management code paths to restore the orgininal behaviour.

Fixes: 7c0edad364 ("x86/cpu/topology: Rework possible CPU management")
Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20241202145905.1482-1-ffmancera@riseup.net
This commit is contained in:
Fernando Fernandez Mancera 2024-12-02 14:58:45 +00:00 • committed by Thomas Gleixner
parent d0ceea662d
commit 73da582a47
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kernel/cpu/topology.c
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@ -428,8 +428,8 @@ void __init topology_apply_cmdline_limits_early(void)
{
unsigned int possible = nr_cpu_ids;
/* 'maxcpus=0' 'nosmp' 'nolapic' 'disableapic' 'noapic' */
if (!setup_max_cpus || ioapic_is_disabled || apic_is_disabled)
/* 'maxcpus=0' 'nosmp' 'nolapic' 'disableapic' */
if (!setup_max_cpus || apic_is_disabled)
possible = 1;
/* 'possible_cpus=N' */
@ -443,7 +443,7 @@ void __init topology_apply_cmdline_limits_early(void)
static __init bool restrict_to_up(void)
{
if (!smp_found_config || ioapic_is_disabled)
if (!smp_found_config)
return true;
/*
* XEN PV is special as it does not advertise the local APIC