Re: [PATCH 3/8] v3 Add section count to memory_block

KAMEZAWA Hiroyuki
2010-07-20T07:06:17Z

On Mon, 19 Jul 2010 22:53:58 -0500
Nathan Fontenot <nfont@austin.ibm.com> wrote:

> Add a section count property to the memory_block struct to track the number
> of memory sections that have been added/removed from a emory block.
>
> Signed-off-by: Nathan Fontenot <nfont@asutin.ibm.com>
> ---
> drivers/base/memory.c | 19 ++++++++++++-------
> include/linux/memory.h | 2 ++
> 2 files changed, 14 insertions(+), 7 deletions(-)
>
> Index: linux-2.6/drivers/base/memory.c
> ===================================================================
> --- linux-2.6.orig/drivers/base/memory.c 2010-07-19 20:43:49.000000000 -0500
> +++ linux-2.6/drivers/base/memory.c 2010-07-19 20:44:01.000000000 -0500
> @@ -487,6 +487,7 @@ static int add_memory_block(int nid, str
>
> mem->start_phys_index = __section_nr(section);
> mem->state = state;
> + atomic_inc(&mem->section_count);
> mutex_init(&mem->state_mutex);
> start_pfn = section_nr_to_pfn(mem->start_phys_index);
> mem->phys_device = arch_get_memory_phys_device(start_pfn);
> @@ -516,13 +517,17 @@ int remove_memory_block(unsigned long no
> struct memory_block *mem;
>
> mem = find_memory_block(section);
> - unregister_mem_sect_under_nodes(mem);
> - mem_remove_simple_file(mem, start_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);
> - unregister_memory(mem, section);
> + atomic_dec(&mem->section_count);
> +
> + if (atomic_read(&mem->section_count) == 0) {

We use atomic_dec_and_test() in usual.

Otherwise, I don't see other problems in other part. Please fix this nitpick.

Regards,
-Kame