[PATCH 2/7] Create the new 'end_phys_index' file

[Nathan Fontenot <nfont@austin.ibm.com>]

This patch adds a new 'end_phys_index' file to each memory sysfs
directory to report the physical index of the last memory section
coverd by the sysfs directory.

Signed -off-by: Nathan Fontenot <nfont@austin.ibm.com>

---
 drivers/base/memory.c  |   14 +++++++++++++-
 include/linux/memory.h |    3 +++
 2 files changed, 16 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/base/memory.c
===================================================================
--- linux-2.6.orig/drivers/base/memory.c	2010-07-09 14:23:09.000000000 -0500
+++ linux-2.6/drivers/base/memory.c	2010-07-09 14:23:17.000000000 -0500
@@ -121,7 +121,15 @@
 {
 	struct memory_block *mem =
 		container_of(dev, struct memory_block, sysdev);
-	return sprintf(buf, "%08lx\n", mem->phys_index);
+	return sprintf(buf, "%08lx\n", mem->start_phys_index);
+}
+
+static ssize_t show_mem_end_phys_index(struct sys_device *dev,
+			struct sysdev_attribute *attr, char *buf)
+{
+	struct memory_block *mem =
+		container_of(dev, struct memory_block, sysdev);
+	return sprintf(buf, "%08lx\n", mem->end_phys_index);
 }
 
 /*
@@ -327,6 +335,7 @@
 }
 
 static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
+static SYSDEV_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL);
 static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
 static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
 static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
@@ -536,6 +545,8 @@
 		if (!ret)
 			ret = mem_create_simple_file(mem, phys_index);
 		if (!ret)
+			ret = mem_create_simple_file(mem, end_phys_index);
+		if (!ret)
 			ret = mem_create_simple_file(mem, state);
 		if (!ret)
 			ret = mem_create_simple_file(mem, phys_device);
@@ -581,6 +592,7 @@
 	if (list_empty(&mem->sections)) {
 		unregister_mem_sect_under_nodes(mem);
 		mem_remove_simple_file(mem, phys_index);
+		mem_remove_simple_file(mem, end_phys_index);
 		mem_remove_simple_file(mem, state);
 		mem_remove_simple_file(mem, phys_device);
 		mem_remove_simple_file(mem, removable);
Index: linux-2.6/include/linux/memory.h
===================================================================
--- linux-2.6.orig/include/linux/memory.h	2010-07-09 14:22:44.000000000 -0500
+++ linux-2.6/include/linux/memory.h	2010-07-09 14:23:17.000000000 -0500
@@ -29,6 +29,9 @@
 
 struct memory_block {
 	unsigned long state;
+	unsigned long start_phys_index;
+	unsigned long end_phys_index;
+
 	/*
 	 * This serializes all state change requests.  It isn't
 	 * held during creation because the control files are