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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2006-06-27 02:53:35 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-27 17:32:36 -0700
commit0a54703904a4a206686b4e8c3f5a6927b60747aa (patch)
tree2aa373cdd78094666d9cdf526391235a65afaee8 /mm/memory_hotplug.c
parent9af3c2dea3a3ae4248d81a70b556adfe1dc65d55 (diff)
downloadlwn-0a54703904a4a206686b4e8c3f5a6927b60747aa.tar.gz
lwn-0a54703904a4a206686b4e8c3f5a6927b60747aa.zip
[PATCH] register hot-added memory to iomem resource
Register hot-added memory to iomem_resource. With this, /proc/iomem can show hot-added memory. Note: kdump uses /proc/iomem to catch memory range when it is installed. So, kdump should be re-installed after /proc/iomem change. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 83d37a401b3b..0b11a8543441 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -21,6 +21,7 @@
#include <linux/memory_hotplug.h>
#include <linux/highmem.h>
#include <linux/vmalloc.h>
+#include <linux/ioport.h>
#include <asm/tlbflush.h>
@@ -192,6 +193,27 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
return;
}
+/* add this memory to iomem resource */
+static void register_memory_resource(u64 start, u64 size)
+{
+ struct resource *res;
+
+ res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+ BUG_ON(!res);
+
+ res->name = "System RAM";
+ res->start = start;
+ res->end = start + size - 1;
+ res->flags = IORESOURCE_MEM;
+ if (request_resource(&iomem_resource, res) < 0) {
+ printk("System RAM resource %llx - %llx cannot be added\n",
+ (unsigned long long)res->start, (unsigned long long)res->end);
+ kfree(res);
+ }
+}
+
+
+
int add_memory(int nid, u64 start, u64 size)
{
pg_data_t *pgdat = NULL;
@@ -217,6 +239,9 @@ int add_memory(int nid, u64 start, u64 size)
/* we online node here. we have no error path from here. */
node_set_online(nid);
+ /* register this memory as resource */
+ register_memory_resource(start, size);
+
return ret;
error:
/* rollback pgdat allocation and others */