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Driver core: Add section count to memory_block struct

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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 <nfont@austin.ibm.com>
Reviewed-by: Robin Holt <holt@sgi.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Nathan Fontenot 2010-10-19 12:46:19 -05:00 committed by Greg Kroah-Hartman
parent 2938ffbd46
commit 0768121597
2 changed files with 13 additions and 6 deletions
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17
drivers/base/memory.c
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@ -490,6 +490,7 @@ static int add_memory_block(int nid, struct mem_section *section,
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);
@ -519,12 +520,16 @@ int remove_memory_block(unsigned long node_id, struct mem_section *section,
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;

2
include/linux/memory.h
View file

@ -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