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x86/boot/smp: Don't try to poke disabled/non-existent APIC

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Apparently trying to poke a disabled or non-existent APIC
leads to a box that doesn't even boot. Let's not do that.

No real clue if this is the right fix, but at least my
P3 machine boots again.

Signed-off-by: Ville Syrjälä <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: Eric Biederman <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Juergen Gross <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Yinghai Lu <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Fixes: 2a51fe083e ("arch/x86: Handle non enumerated CPU after physical hotplug")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ville Syrjälä 2016-10-22 05:18:04 +03:00 • committed by Ingo Molnar
commit ff8560512b
1 changed files with 9 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

16
arch/x86/kernel/smpboot.c
View file

@ -1409,15 +1409,17 @@ __init void prefill_possible_map(void)
/* No boot processor was found in mptable or ACPI MADT */
if (!num_processors) {
int apicid = boot_cpu_physical_apicid;
int cpu = hard_smp_processor_id();
if (boot_cpu_has(X86_FEATURE_APIC)) {
int apicid = boot_cpu_physical_apicid;
int cpu = hard_smp_processor_id();
pr_warn("Boot CPU (id %d) not listed by BIOS\n", cpu);
pr_warn("Boot CPU (id %d) not listed by BIOS\n", cpu);
/* Make sure boot cpu is enumerated */
if (apic->cpu_present_to_apicid(0) == BAD_APICID &&
apic->apic_id_valid(apicid))
generic_processor_info(apicid, boot_cpu_apic_version);
/* Make sure boot cpu is enumerated */
if (apic->cpu_present_to_apicid(0) == BAD_APICID &&
apic->apic_id_valid(apicid))
generic_processor_info(apicid, boot_cpu_apic_version);
}
if (!num_processors)
num_processors = 1;