[PATCH] pgdat allocation for new node add (get node id by acpi)

This is to find node id from acpi's handle of memory_device in DSDT.  _PXM for
the new node can be found by acpi_get_pxm() by using new memory's handle.  So,
node id can be found by pxm_to_nid_map[].

  This patch becomes simpler than v2 of node hot-add patch.
  Because old add_memory() function doesn't have node id parameter.
  So, kernel must find its handle by physical address via DSDT again.
  But, v3 just give node id to add_memory() now.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 0424326..1012284 100644 (file)
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -215,7 +215,7 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
 {
        int result, num_enabled = 0;
        struct acpi_memory_info *info;
-       int node = 0;
+       int node;
 
        ACPI_FUNCTION_TRACE("acpi_memory_enable_device");
 
@@ -228,6 +228,7 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
                return result;
        }
 
+       node = acpi_get_node(mem_device->handle);
        /*
         * Tell the VM there is more memory here...
         * Note: Assume that this function returns zero on success

diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index e2c1a16..13d6d5b 100644 (file)
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -254,5 +254,18 @@ int acpi_get_pxm(acpi_handle h)
        } while (ACPI_SUCCESS(status));
        return -1;
 }
-
 EXPORT_SYMBOL(acpi_get_pxm);
+
+int acpi_get_node(acpi_handle *handle)
+{
+       int pxm, node = -1;
+
+       ACPI_FUNCTION_TRACE("acpi_get_node");
+
+       pxm = acpi_get_pxm(handle);
+       if (pxm >= 0)
+               node = acpi_map_pxm_to_node(pxm);
+
+       return_VALUE(node);
+}
+EXPORT_SYMBOL(acpi_get_node);

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 90d6df1..88b5dfd 100644 (file)
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -528,12 +528,18 @@ static inline void acpi_set_cstate_limit(unsigned int new_limit) { return; }
 
 #ifdef CONFIG_ACPI_NUMA
 int acpi_get_pxm(acpi_handle handle);
+int acpi_get_node(acpi_handle *handle);
 #else
 static inline int acpi_get_pxm(acpi_handle handle)
 {
        return 0;
 }
+static inline int acpi_get_node(acpi_handle *handle)
+{
+       return 0;
+}
 #endif
+extern int acpi_paddr_to_node(u64 start_addr, u64 size);
 
 extern int pnpacpi_disabled;