linux-kernel - [PATCH v2 2/2] mem-hotplug: Introduce MMOP_OFFLINE to replace the hard coding -1.

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Date:	Fri, 6 Jun 2014 11:58:54 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	<gregkh@...uxfoundation.org>, <akpm@...ux-foundation.org>,
	<toshi.kani@...com>, <tj@...nel.org>, <hpa@...or.com>,
	<mingo@...e.hu>, <laijs@...fujitsu.com>
CC:	<isimatu.yasuaki@...fujitsu.com>, <hutao@...fujitsu.com>,
	<guz.fnst@...fujitsu.com>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: [PATCH v2 2/2] mem-hotplug: Introduce MMOP_OFFLINE to replace the hard coding -1.

In store_mem_state(), we have:
......
 334         else if (!strncmp(buf, "offline", min_t(int, count, 7)))
 335                 online_type = -1;
......
 355         case -1:
 356                 ret = device_offline(&mem->dev);
 357                 break;
......

Here, "offline" is hard coded as -1.

This patch does the following renaming:
 ONLINE_KEEP     ->  MMOP_ONLINE_KEEP
 ONLINE_KERNEL   ->  MMOP_ONLINE_KERNEL
 ONLINE_MOVABLE  ->  MMOP_ONLINE_MOVABLE

and introduce MMOP_OFFLINE = -1 to avoid hard coding.

Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 drivers/base/memory.c          | 16 ++++++++--------
 include/linux/memory_hotplug.h |  9 +++++----
 mm/memory_hotplug.c            |  9 ++++++---
 3 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index fa664b9..0f3fa8c 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -294,7 +294,7 @@ static int memory_subsys_online(struct device *dev)
 	 * attribute and need to set the online_type.
 	 */
 	if (mem->online_type < 0)
-		mem->online_type = ONLINE_KEEP;
+		mem->online_type = MMOP_ONLINE_KEEP;
 
 	ret = memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE);
 
@@ -326,22 +326,22 @@ store_mem_state(struct device *dev,
 		return ret;
 
 	if (sysfs_streq(buf, "online_kernel"))
-		online_type = ONLINE_KERNEL;
+		online_type = MMOP_ONLINE_KERNEL;
 	else if (sysfs_streq(buf, "online_movable"))
-		online_type = ONLINE_MOVABLE;
+		online_type = MMOP_ONLINE_MOVABLE;
 	else if (sysfs_streq(buf, "online"))
-		online_type = ONLINE_KEEP;
+		online_type = MMOP_ONLINE_KEEP;
 	else if (sysfs_streq(buf, "offline"))
-		online_type = -1;
+		online_type = MMOP_OFFLINE;
 	else {
 		ret = -EINVAL;
 		goto err;
 	}
 
 	switch (online_type) {
-	case ONLINE_KERNEL:
-	case ONLINE_MOVABLE:
-	case ONLINE_KEEP:
+	case MMOP_ONLINE_KERNEL:
+	case MMOP_ONLINE_MOVABLE:
+	case MMOP_ONLINE_KEEP:
 		/*
 		 * mem->online_type is not protected so there can be a
 		 * race here.  However, when racing online, the first
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 4ca3d95..b4240cf 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -26,11 +26,12 @@ enum {
 	MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
 };
 
-/* Types for control the zone type of onlined memory */
+/* Types for control the zone type of onlined and offlined memory */
 enum {
-	ONLINE_KEEP,
-	ONLINE_KERNEL,
-	ONLINE_MOVABLE,
+	MMOP_OFFLINE = -1,
+	MMOP_ONLINE_KEEP,
+	MMOP_ONLINE_KERNEL,
+	MMOP_ONLINE_MOVABLE,
 };
 
 /*
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a650db2..6075f04 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -907,19 +907,22 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
 	 */
 	zone = page_zone(pfn_to_page(pfn));
 
-	if ((zone_idx(zone) > ZONE_NORMAL || online_type == ONLINE_MOVABLE) &&
+	if ((zone_idx(zone) > ZONE_NORMAL ||
+	     online_type == MMOP_ONLINE_MOVABLE) &&
 	    !can_online_high_movable(zone)) {
 		unlock_memory_hotplug();
 		return -EINVAL;
 	}
 
-	if (online_type == ONLINE_KERNEL && zone_idx(zone) == ZONE_MOVABLE) {
+	if (online_type == MMOP_ONLINE_KERNEL &&
+	    zone_idx(zone) == ZONE_MOVABLE) {
 		if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) {
 			unlock_memory_hotplug();
 			return -EINVAL;
 		}
 	}
-	if (online_type == ONLINE_MOVABLE && zone_idx(zone) == ZONE_MOVABLE - 1) {
+	if (online_type == MMOP_ONLINE_MOVABLE &&
+	    zone_idx(zone) == ZONE_MOVABLE - 1) {
 		if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) {
 			unlock_memory_hotplug();
 			return -EINVAL;
-- 
1.8.3.1

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