Add a section count property to the memory_block struct to track the number
of memory sections that have been added/removed from a memory block. This
allows us to know when the last memory section of a memory block has been
removed so we can remove the memory block.
Signed-off-by: Nathan Fontenot <nf...@austin.ibm.com>
---
drivers/base/memory.c | 17 +++++++++++------
include/linux/memory.h | 2 ++
2 files changed, 13 insertions(+), 6 deletions(-)
Index: linux-next/drivers/base/memory.c
===================================================================
--- linux-next.orig/drivers/base/memory.c 2010-09-30 14:12:41.000000000
-0500
+++ linux-next/drivers/base/memory.c 2010-09-30 14:13:50.000000000 -0500
@@ -482,6 +482,7 @@
mem->phys_index = __section_nr(section);
mem->state = state;
+ mem->section_count++;
mutex_init(&mem->state_mutex);
start_pfn = section_nr_to_pfn(mem->phys_index);
mem->phys_device = arch_get_memory_phys_device(start_pfn);
@@ -511,12 +512,16 @@
mutex_lock(&mem_sysfs_mutex);
mem = find_memory_block(section);
- unregister_mem_sect_under_nodes(mem);
- mem_remove_simple_file(mem, phys_index);
- mem_remove_simple_file(mem, state);
- mem_remove_simple_file(mem, phys_device);
- mem_remove_simple_file(mem, removable);
- unregister_memory(mem, section);
+
+ mem->section_count--;
+ if (mem->section_count == 0) {
+ unregister_mem_sect_under_nodes(mem);
+ mem_remove_simple_file(mem, phys_index);
+ mem_remove_simple_file(mem, state);
+ mem_remove_simple_file(mem, phys_device);
+ mem_remove_simple_file(mem, removable);
+ unregister_memory(mem, section);
+ }
mutex_unlock(&mem_sysfs_mutex);
return 0;
Index: linux-next/include/linux/memory.h
===================================================================
--- linux-next.orig/include/linux/memory.h 2010-09-29 14:56:29.000000000
-0500
+++ linux-next/include/linux/memory.h 2010-09-30 14:13:50.000000000 -0500
@@ -23,6 +23,8 @@
struct memory_block {
unsigned long phys_index;
unsigned long state;
+ int section_count;
+
/*
* This serializes all state change requests. It isn't
* held during creation because the control files are
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