On Thu, Nov 03, 2022 at 04:03:43PM -0400, Mathieu Desnoyers wrote:
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 08969f5aa38d..6a2323266942 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -1047,6 +1047,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
> tsk->reported_split_lock = 0;
> #endif
>
> +#ifdef CONFIG_SCHED_MM_VCPU
> + tsk->mm_vcpu = -1;
> + tsk->mm_vcpu_active = 0;
> +#endif
> return tsk;
>
> free_stack:
Note how the above hunk does exactly the same as the below thunk, and I
think they're even on the same code-path.
How about moving all of this to __sched_fork() or something?
> @@ -1579,6 +1586,7 @@ static int copy_mm(unsigned long clone_flags, struct task_struct *tsk)
>
> tsk->mm = mm;
> tsk->active_mm = mm;
> + sched_vcpu_fork(tsk);
> return 0;
> }
> +void sched_vcpu_fork(struct task_struct *t)
> +{
> + WARN_ON_ONCE((t->flags & PF_KTHREAD) || !t->mm);
> + t->mm_vcpu = -1;
> + t->mm_vcpu_active = 1;
> +}
