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x86/cpu/intel: Evaluate smp_num_siblings early

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commit 1910ad5624968f93be48e8e265513c54d66b897c upstream.

Make use of the new early detection function to initialize smp_num_siblings
on the boot cpu before the MP-Table or ACPI/MADT scan happens. That's
required for force disabling SMT.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2018-06-06 01:00:55 +02:00 committed by Greg Kroah-Hartman
parent c3155990e2
commit dcf82399d6
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kernel/cpu/intel.c
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@ -301,6 +301,13 @@ static void early_init_intel(struct cpuinfo_x86 *c)
}
check_mpx_erratum(c);
/*
* Get the number of SMT siblings early from the extended topology
* leaf, if available. Otherwise try the legacy SMT detection.
*/
if (detect_extended_topology_early(c) < 0)
detect_ht_early(c);
}
#ifdef CONFIG_X86_32