linux-kernel - Re: [PATCH v3 1/8] drivers/base/memory: rename MMOP_ONLINE_KEEP to MMOP

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Date:   Thu, 19 Mar 2020 17:28:05 +0100
From:   Pankaj Gupta <pankaj.gupta.linux@...il.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linuxppc-dev@...ts.ozlabs.org, linux-hyperv@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Baoquan He <bhe@...hat.com>
Subject: Re: [PATCH v3 1/8] drivers/base/memory: rename MMOP_ONLINE_KEEP to MMOP_ONLINE

> The name is misleading and it's not really clear what is "kept". Let's just
> name it like the online_type name we expose to user space ("online").
>
> Add some documentation to the types.
>
> Reviewed-by: Wei Yang <richard.weiyang@...il.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Baoquan He <bhe@...hat.com>
> Cc: Wei Yang <richard.weiyang@...il.com>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  drivers/base/memory.c          | 9 +++++----
>  include/linux/memory_hotplug.h | 6 +++++-
>  2 files changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index 6448c9ece2cb..8c5ce42c0fc3 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -216,7 +216,7 @@ static int memory_subsys_online(struct device *dev)
>          * attribute and need to set the online_type.
>          */
>         if (mem->online_type < 0)
> -               mem->online_type = MMOP_ONLINE_KEEP;
> +               mem->online_type = MMOP_ONLINE;
>
>         ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
>
> @@ -251,7 +251,7 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr,
>         else if (sysfs_streq(buf, "online_movable"))
>                 online_type = MMOP_ONLINE_MOVABLE;
>         else if (sysfs_streq(buf, "online"))
> -               online_type = MMOP_ONLINE_KEEP;
> +               online_type = MMOP_ONLINE;
>         else if (sysfs_streq(buf, "offline"))
>                 online_type = MMOP_OFFLINE;
>         else {
> @@ -262,7 +262,7 @@ static ssize_t state_store(struct device *dev, struct device_attribute *attr,
>         switch (online_type) {
>         case MMOP_ONLINE_KERNEL:
>         case MMOP_ONLINE_MOVABLE:
> -       case MMOP_ONLINE_KEEP:
> +       case MMOP_ONLINE:
>                 /* mem->online_type is protected by device_hotplug_lock */
>                 mem->online_type = online_type;
>                 ret = device_online(&mem->dev);
> @@ -342,7 +342,8 @@ static ssize_t valid_zones_show(struct device *dev,
>         }
>
>         nid = mem->nid;
> -       default_zone = zone_for_pfn_range(MMOP_ONLINE_KEEP, nid, start_pfn, nr_pages);
> +       default_zone = zone_for_pfn_range(MMOP_ONLINE, nid, start_pfn,
> +                                         nr_pages);
>         strcat(buf, default_zone->name);
>
>         print_allowed_zone(buf, nid, start_pfn, nr_pages, MMOP_ONLINE_KERNEL,
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 3195d11876ea..3aaf00db224c 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -47,9 +47,13 @@ enum {
>
>  /* Types for control the zone type of onlined and offlined memory */
>  enum {
> +       /* Offline the memory. */
>         MMOP_OFFLINE = -1,
> -       MMOP_ONLINE_KEEP,
> +       /* Online the memory. Zone depends, see default_zone_for_pfn(). */
> +       MMOP_ONLINE,
> +       /* Online the memory to ZONE_NORMAL. */
>         MMOP_ONLINE_KERNEL,
> +       /* Online the memory to ZONE_MOVABLE. */
>         MMOP_ONLINE_MOVABLE,
>  };
>
> --
Looks good to me.

Acked-by: Pankaj Gupta <pankaj.gupta.linux@...il.com>

> 2.24.1
>
>