linux-kernel - Re: [PATCH 3/8] v3 Add section count to memory

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Message-Id: <20100720160131.7cc8c0a2.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 20 Jul 2010 16:01:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Nathan Fontenot <nfont@...tin.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...abs.org, greg@...ah.com
Subject: Re: [PATCH 3/8] v3 Add section count to memory_block

On Mon, 19 Jul 2010 22:53:58 -0500
Nathan Fontenot <nfont@...tin.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@...tin.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


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