linux-kernel - Re: [PATCH 2/5] v2 Create new 'end_phys

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Date:	Fri, 16 Jul 2010 09:08:57 +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
Subject: Re: [PATCH 2/5] v2 Create new 'end_phys_index' file

On Thu, 15 Jul 2010 13:38:52 -0500
Nathan Fontenot <nfont@...tin.ibm.com> wrote:

> Add a new 'end_phys_index' file to each memory sysfs directory to
> report the physical index of the last memory section
> covered by the sysfs directory.
> 
> Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>

Does memory_block have to be contiguous between [phys_index, end_phys_index] ?
Should we provide "# of sections" or "amount of memory under a block" ?

No objections to end_phys_index...buf plz fix diff style.

Thanks,
-Kame


> ---
>  drivers/base/memory.c  |   14 +++++++++++++-
>  include/linux/memory.h |    3 +++
>  2 files changed, 16 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6/drivers/base/memory.c
> ===================================================================
> --- linux-2.6.orig/drivers/base/memory.c	2010-07-15 09:55:54.000000000 -0500
> +++ linux-2.6/drivers/base/memory.c	2010-07-15 09:56:05.000000000 -0500
> @@ -121,7 +121,15 @@
>  {
>  	struct memory_block *mem =
>  		container_of(dev, struct memory_block, sysdev);
> -	return sprintf(buf, "%08lx\n", mem->phys_index);
> +	return sprintf(buf, "%08lx\n", mem->start_phys_index);
> +}
> +
> +static ssize_t show_mem_end_phys_index(struct sys_device *dev,
> +			struct sysdev_attribute *attr, char *buf)
> +{
> +	struct memory_block *mem =
> +		container_of(dev, struct memory_block, sysdev);
> +	return sprintf(buf, "%08lx\n", mem->end_phys_index);
>  }
>  
>  /*
> @@ -321,6 +329,7 @@
>  }
>  
>  static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
> +static SYSDEV_ATTR(end_phys_index, 0444, show_mem_end_phys_index, NULL);
>  static SYSDEV_ATTR(state, 0644, show_mem_state, store_mem_state);
>  static SYSDEV_ATTR(phys_device, 0444, show_phys_device, NULL);
>  static SYSDEV_ATTR(removable, 0444, show_mem_removable, NULL);
> @@ -533,6 +542,8 @@
>  		if (!ret)
>  			ret = mem_create_simple_file(mem, phys_index);
>  		if (!ret)
> +			ret = mem_create_simple_file(mem, end_phys_index);
> +		if (!ret)
>  			ret = mem_create_simple_file(mem, state);
>  		if (!ret)
>  			ret = mem_create_simple_file(mem, phys_device);
> @@ -577,6 +588,7 @@
>  	if (list_empty(&mem->sections)) {
>  		unregister_mem_sect_under_nodes(mem);
>  		mem_remove_simple_file(mem, 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);
> Index: linux-2.6/include/linux/memory.h
> ===================================================================
> --- linux-2.6.orig/include/linux/memory.h	2010-07-15 09:54:06.000000000 -0500
> +++ linux-2.6/include/linux/memory.h	2010-07-15 09:56:05.000000000 -0500
> @@ -29,6 +29,9 @@
>  
>  struct memory_block {
>  	unsigned long state;
> +	unsigned long start_phys_index;
> +	unsigned long end_phys_index;
> +
>  	/*
>  	 * This serializes all state change requests.  It isn't
>  	 * held during creation because the control files are
> 
> --
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