linux-kernel - Re: [PATCH v4 1/2] mm/migration: make isolate_movable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170126091833.GC6590@dhcp22.suse.cz>
Date:   Thu, 26 Jan 2017 10:18:34 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     ysxie@...mail.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        n-horiguchi@...jp.nec.com, akpm@...ux-foundation.org,
        minchan@...nel.org, vbabka@...e.cz, guohanjun@...wei.com,
        qiuxishi@...wei.com
Subject: Re: [PATCH v4 1/2] mm/migration: make isolate_movable_page always
 defined

On Wed 25-01-17 23:05:37, ysxie@...mail.com wrote:
> From: Yisheng Xie <xieyisheng1@...wei.com>
> 
> 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@...wei.com>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> CC: Vlastimil Babka <vbabka@...e.cz>
> ---
>  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