linux-kernel - [Patch v4 1/8] memory hotplug: suppress "Device memoryX does not have a release() function" warning

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Message-Id: <1351682594-17347-2-git-send-email-wency@cn.fujitsu.com>
Date:	Wed, 31 Oct 2012 19:23:07 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Cc:	Jiang Liu <liuj97@...il.com>, Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	rjw@...k.pl, Lai Jiangshan <laijs@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Wen Congyang <wency@...fujitsu.com>, Greg KH <greg@...ah.com>
Subject: [Patch v4 1/8] memory hotplug: suppress "Device memoryX does not have a release() function" warning

From: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

When calling remove_memory_block(), the function shows following message
at device_release().

"Device 'memory528' does not have a release() function, it is broken and
must be fixed."

The reason is memory_block's device struct does not have a release()
function.

So the patch registers memory_block_release() to the device's release()
function for suppressing the warning message.  Additionally, the patch
moves kfree(mem) into the release function since the release function is
prepared as a means to free a memory_block struct.

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Acked-by: David Rientjes <rientjes@...gle.com>
Cc: Jiang Liu <liuj97@...il.com>
Cc: Minchan Kim <minchan.kim@...il.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Wen Congyang <wency@...fujitsu.com>
Cc: Greg KH <greg@...ah.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
 drivers/base/memory.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 86c8821..7eb1211 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -70,6 +70,13 @@ void unregister_memory_isolate_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_memory_isolate_notifier);
 
+static void memory_block_release(struct device *dev)
+{
+	struct memory_block *mem = container_of(dev, struct memory_block, dev);
+
+	kfree(mem);
+}
+
 /*
  * register_memory - Setup a sysfs device for a memory block
  */
@@ -80,6 +87,7 @@ int register_memory(struct memory_block *memory)
 
 	memory->dev.bus = &memory_subsys;
 	memory->dev.id = memory->start_section_nr / sections_per_block;
+	memory->dev.release = memory_block_release;
 
 	error = device_register(&memory->dev);
 	return error;
@@ -635,7 +643,6 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
 		mem_remove_simple_file(mem, phys_device);
 		mem_remove_simple_file(mem, removable);
 		unregister_memory(mem);
-		kfree(mem);
 	} else
 		kobject_put(&mem->dev.kobj);
 
-- 
1.8.0

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