On Wed, 21 Nov 2018, Thomas Gleixner wrote:
> Make the scheduler's 'sched_smt_present' static key globaly available, so
> it can be used in the x86 speculation control code.
>
> Provide a query function and a stub for the CONFIG_SMP=n case.
>
> Signed-off-by: Thomas Gleixner <t...@linutronix.de>
> ---
> include/linux/sched/topology.h | 9 +++++++++
> kernel/sched/sched.h | 3 ---
> 2 files changed, 9 insertions(+), 3 deletions(-)
>
> --- a/include/linux/sched/topology.h
> +++ b/include/linux/sched/topology.h
> @@ -34,10 +34,19 @@
> #define SD_NUMA 0x4000 /* cross-node balancing */
>
> #ifdef CONFIG_SCHED_SMT
> +extern struct static_key_false sched_smt_present;
> +
> +static __always_inline bool sched_smt_active(void)
> +{
> + return static_branch_likely(&sched_smt_present);
0day just told me that this breaks ia64.
/me goes to fix
