On Thu, Nov 28, 2013 at 04:48:41PM +0900, Joonsoo Kim wrote:
> In each rmap traverse case, there is some difference so that we need
> function pointers and arguments to them in order to handle these
> difference properly.
>
> For this purpose, struct rmap_walk_control is introduced in this patch,
> and will be extended in following patch. Introducing and extending are
> separate, because it clarify changes.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com>
Reviewed-by: Naoya Horiguchi <n-horigu...@ah.jp.nec.com>
A few comment below ...
> diff --git a/include/linux/ksm.h b/include/linux/ksm.h
> index 45c9b6a..0eef8cb 100644
> --- a/include/linux/ksm.h
> +++ b/include/linux/ksm.h
> @@ -76,8 +76,7 @@ struct page *ksm_might_need_to_copy(struct page *page,
> int page_referenced_ksm(struct page *page,
> struct mem_cgroup *memcg, unsigned long *vm_flags);
> int try_to_unmap_ksm(struct page *page, enum ttu_flags flags);
> -int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
> - struct vm_area_struct *, unsigned long, void *), void *arg);
> +int rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc);
> void ksm_migrate_page(struct page *newpage, struct page *oldpage);
>
> #else /* !CONFIG_KSM */
> @@ -120,8 +119,8 @@ static inline int try_to_unmap_ksm(struct page *page,
> enum ttu_flags flags)
> return 0;
> }
>
> -static inline int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct
> page*,
> - struct vm_area_struct *, unsigned long, void *), void *arg)
> +static inline int rmap_walk_ksm(struct page *page,
> + struct rmap_walk_control *rwc)
> {
> return 0;
> }
> diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> index 6dacb93..0f65686 100644
> --- a/include/linux/rmap.h
> +++ b/include/linux/rmap.h
> @@ -235,11 +235,16 @@ struct anon_vma *page_lock_anon_vma_read(struct page
> *page);
> void page_unlock_anon_vma_read(struct anon_vma *anon_vma);
> int page_mapped_in_vma(struct page *page, struct vm_area_struct *vma);
>
> +struct rmap_walk_control {
> + int (*main)(struct page *, struct vm_area_struct *,
> + unsigned long, void *);
Maybe you can add parameters' names to make this prototype more readable.
> + void *arg; /* argument to main function */
> +};
> +
> /*
> * Called by migrate.c to remove migration ptes, but might be used more
> later.
> */
This comment also needs update?
Thanks,
Naoya Horiguchi
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