On Wed 25-01-17 23:05:37, ysxie@xxxxxxxxxxx wrote:
> From: Yisheng Xie <xieyisheng1@xxxxxxxxxx>
>
> Define isolate_movable_page as a static inline function when
> CONFIG_MIGRATION is not enable. It should return false
> here which means failed to isolate movable pages.
>
> This patch do not have any functional change but prepare for
> later patch.
I think it would make more sense to make isolate_movable_page return int
and have the same semantic as __isolate_lru_page. This would be a better
preparatory patch for the later work.
> Signed-off-by: Yisheng Xie <xieyisheng1@xxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxxxx>
> Cc: Minchan Kim <minchan@xxxxxxxxxx>
> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> CC: Vlastimil Babka <vbabka@xxxxxxx>
> ---
> include/linux/migrate.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index ae8d475..631a8c8 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -56,6 +56,8 @@ static inline int migrate_pages(struct list_head *l, new_page_t new,
> free_page_t free, unsigned long private, enum migrate_mode mode,
> int reason)
> { return -ENOSYS; }
> +static inline bool isolate_movable_page(struct page *page, isolate_mode_t mode)
> + { return false; }
>
> static inline int migrate_prep(void) { return -ENOSYS; }
> static inline int migrate_prep_local(void) { return -ENOSYS; }
> --
> 1.9.1
>
>
>
--
Michal Hocko
SUSE Labs
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