Commit 07681215 authored by Nathan Fontenot's avatar Nathan Fontenot Committed by Greg Kroah-Hartman
Browse files

Driver core: Add section count to memory_block struct 



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: default avatarNathan Fontenot <nfont@austin.ibm.com>
Reviewed-by: default avatarRobin Holt <holt@sgi.com>
Reviewed-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 2938ffbd

drivers/base/memory.c

+11 −6
Original line number Diff line number Diff line
@@ -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);



	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;

include/linux/memory.h

+2 −0
Original line number Diff line number Diff line
@@ -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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