On Fri, Jul 25, 2025 at 11:54:26AM +0200, Igor Mammedov wrote: > save_id() is called too early and uses xapic ops, which is fine > up to 2566 cpus. > However with that any CPU with APIC ID more than 255 will set > wrong bit in online_cpus (since xapic ops only handle 8bit IDs, > thus losing all higher bit x2apic might have). > As result CPUs with id higher than 255 are not registered > (they will trumple over elements in range 0-255 instead). > > To fix it move save_id() after the point where APs have > switched to x2apic ops, to get non-truncated ID. > > Signed-off-by: Igor Mammedov <imammedo@xxxxxxxxxx> Reviewed-by: Peter Xu <peterx@xxxxxxxxxx> -- Peter Xu
