On Thu, Jan 22, 2026 at 10:15:43PM +0800, Hou Wenlong wrote:
> The commit 1f60230cdc63 ("x86/smp: Use static_call for
> arch_send_call_function_ipi()") changed to use a static call for
> arch_send_call_function_ipi(), which causes two problems:
>
> First, the KVM guest also changes 'smp_ops.send_call_func_ipi' when the
> PV sched yield feature is available. However, the missing
> static_call_update() breaks the PV sched yield feature.
>
> Additionally, xen_smp_init() is called before static_call_init() during
> the booting of the XENPV guest, which triggers a warning in
> __static_call_update().
>
> To simplify, move the static call update for 'smp_ops' into
> smp_prepare_boot_cpu() to address these two problems together.
>
> Fixes: 1f60230cdc63 ("x86/smp: Use static_call for
> arch_send_call_function_ipi()")
> Signed-off-by: Hou Wenlong <[email protected]>
> ---
> I'm not sure if the XEN part is okay or not. I think there should be no
> IPI before smp_prepare_boot_cpu(), and even if there is, it's okay for
> the KVM guest to use the native version before smp_prepare_boot_cpu().
All three commits zapped from tip:x86/core.
We can try again once this is resolved.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
