| From foo@baz Tue Aug 14 16:14:56 CEST 2018 |
| From: Thomas Gleixner <tglx@linutronix.de> |
| Date: Wed, 6 Jun 2018 01:00:55 +0200 |
| Subject: x86/cpu/intel: Evaluate smp_num_siblings early |
| |
| From: Thomas Gleixner <tglx@linutronix.de> |
| |
| 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: David Woodhouse <dwmw@amazon.co.uk> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| arch/x86/kernel/cpu/intel.c | 7 +++++++ |
| 1 file changed, 7 insertions(+) |
| |
| --- a/arch/x86/kernel/cpu/intel.c |
| +++ b/arch/x86/kernel/cpu/intel.c |
| @@ -283,6 +283,13 @@ static void early_init_intel(struct cpui |
| } |
| |
| 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 |
