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Message-Id: <20100805134943.9841a2e0.kamezawa.hiroyu@jp.fujitsu.com>
Date: Thu, 5 Aug 2010 13:49:43 +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 KH <greg@...ah.com>,
Dave Hansen <dave@...ux.vnet.ibm.com>
Subject: Re: [PATCH 2/9] v4 Add new phys_index properties
On Tue, 03 Aug 2010 08:37:31 -0500
Nathan Fontenot <nfont@...tin.ibm.com> wrote:
> Update the 'phys_index' properties of a memory block to include a
> 'start_phys_index' which is the same as the current 'phys_index' property.
> The property still appears as 'phys_index' in sysfs but the memory_block
> struct name is updated to indicate the start and end values.
> This also adds an 'end_phys_index' property to indicate the id of the
> last section in th memory block.
>
> Signed-off-by: Nathan Fontenot <nfont@...tin.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
nitpick. After this patch, end_phys_index is added but contains 0.
It's better to contain the same value with phys_index..
But, ok. Following patch will fix it.
Thanks,
-Kame
> ---
> drivers/base/memory.c | 28 ++++++++++++++++++++--------
> include/linux/memory.h | 3 ++-
> 2 files changed, 22 insertions(+), 9 deletions(-)
>
> Index: linux-2.6/drivers/base/memory.c
> ===================================================================
> --- linux-2.6.orig/drivers/base/memory.c 2010-08-02 13:32:21.000000000 -0500
> +++ linux-2.6/drivers/base/memory.c 2010-08-02 13:33:27.000000000 -0500
> @@ -109,12 +109,20 @@ unregister_memory(struct memory_block *m
> * uses.
> */
>
> -static ssize_t show_mem_phys_index(struct sys_device *dev,
> +static ssize_t show_mem_start_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->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);
> }
>
> /*
> @@ -128,7 +136,7 @@ static ssize_t show_mem_removable(struct
> struct memory_block *mem =
> container_of(dev, struct memory_block, sysdev);
>
> - start_pfn = section_nr_to_pfn(mem->phys_index);
> + start_pfn = section_nr_to_pfn(mem->start_phys_index);
> ret = is_mem_section_removable(start_pfn, PAGES_PER_SECTION);
> return sprintf(buf, "%d\n", ret);
> }
> @@ -191,7 +199,7 @@ memory_block_action(struct memory_block
> int ret;
> int old_state = mem->state;
>
> - psection = mem->phys_index;
> + psection = mem->start_phys_index;
> first_page = pfn_to_page(psection << PFN_SECTION_SHIFT);
>
> /*
> @@ -264,7 +272,7 @@ store_mem_state(struct sys_device *dev,
> int ret = -EINVAL;
>
> mem = container_of(dev, struct memory_block, sysdev);
> - phys_section_nr = mem->phys_index;
> + phys_section_nr = mem->start_phys_index;
>
> if (!present_section_nr(phys_section_nr))
> goto out;
> @@ -296,7 +304,8 @@ static ssize_t show_phys_device(struct s
> return sprintf(buf, "%d\n", mem->phys_device);
> }
>
> -static SYSDEV_ATTR(phys_index, 0444, show_mem_phys_index, NULL);
> +static SYSDEV_ATTR(phys_index, 0444, show_mem_start_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);
> @@ -476,16 +485,18 @@ static int add_memory_block(int nid, str
> if (!mem)
> return -ENOMEM;
>
> - mem->phys_index = __section_nr(section);
> + mem->start_phys_index = __section_nr(section);
> mem->state = state;
> mutex_init(&mem->state_mutex);
> - start_pfn = section_nr_to_pfn(mem->phys_index);
> + start_pfn = section_nr_to_pfn(mem->start_phys_index);
> mem->phys_device = arch_get_memory_phys_device(start_pfn);
>
> ret = register_memory(mem, section);
> 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);
> @@ -507,6 +518,7 @@ int remove_memory_block(unsigned long no
> mem = find_memory_block(section);
> 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 2010-08-02 13:23:49.000000000 -0500
> +++ linux-2.6/include/linux/memory.h 2010-08-02 13:33:27.000000000 -0500
> @@ -21,7 +21,8 @@
> #include <linux/mutex.h>
>
> struct memory_block {
> - unsigned long phys_index;
> + unsigned long start_phys_index;
> + unsigned long end_phys_index;
> unsigned long state;
> /*
> * This serializes all state change requests. It isn't
>
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