On Thu, 6 Apr 2023 09:53:37 -0700 Stefan Roesch <shr@xxxxxxxxxxxx> wrote:
> So far KSM can only be enabled by calling madvise for memory regions. To
> be able to use KSM for more workloads, KSM needs to have the ability to be
> enabled / disabled at the process / cgroup level.
>
> ...
>
> @@ -53,6 +62,18 @@ void folio_migrate_ksm(struct folio *newfolio, struct folio *folio);
>
> #else /* !CONFIG_KSM */
>
> +static inline int ksm_add_mm(struct mm_struct *mm)
> +{
> +}
The compiler doesn't like the lack of a return value.
I queued up a patch to simply delete the above function - seems that
ksm_add_mm() has no callers if CONFIG_KSM=n.
The same might be true of the ksm_add_vma()...ksm_exit() stubs also,
Perhaps some kind soul could take a look at whether we can simply clean
those out.
