linux-kernel - Re: [PATCH v1 1/5] drivers/base/memory: rename MMOP_ONLINE_KEEP to MMOP

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Date:   Wed, 11 Mar 2020 14:17:28 +0000
From:   Wei Yang <richard.weiyang@...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,
        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>,
        Wei Yang <richard.weiyang@...il.com>
Subject: Re: [PATCH v1 1/5] drivers/base/memory: rename MMOP_ONLINE_KEEP to
 MMOP_ONLINE

On Wed, Mar 11, 2020 at 01:30:22PM +0100, David Hildenbrand wrote:
>The name is misleading. Let's just name it like the online_type name we
>expose to user space ("online").
>
>Add some documentation to the types.
>
>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>

Reviewed-by: Wei Yang <richard.weiyang@...il.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 f4d59155f3d4..261dbf010d5d 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,
> };
> 
>-- 
>2.24.1

-- 
Wei Yang
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