Hi, On 2023-11-22 10:31:31 -0500, Sasha Levin wrote: > From: Zhang Rui <rui.zhang@xxxxxxxxx> > > [ Upstream commit ec9aedb2aa1ab7ac420c00b31f5edc5be15ec167 ] > > Currently, the kernel enumerates the possible CPUs by parsing both ACPI > MADT Local APIC entries and x2APIC entries. So CPUs with "valid" APIC IDs, > even if they have duplicated APIC IDs in Local APIC and x2APIC, are always > enumerated. As just described in https://lore.kernel.org/all/20231206065850.hs7k554v6wym7gw5@xxxxxxxxxxxxxxxxxx/ and also previously described by John Sperbeck https://lore.kernel.org/all/20231122221947.781812-1-jsperbeck@xxxxxxxxxx/ this patch causes some machines to "loose" cpus. All but one in my case. Even if the commit didn't have these unintended consequences, it seems like a commit like this hardly is -stable material? - Andres
