linux-kernel - Re: [Bug fix PATCH v2 1/2] ACPI,acpi_memhotplug: enable acpi_memory_info->enabled of memory device presented at boot-time

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Message-ID: <514A903A.9000909@jp.fujitsu.com>
Date:	Thu, 21 Mar 2013 13:44:42 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Toshi Kani <toshi.kani@...com>, <rjw@...k.pl>
CC:	<linux-acpi@...r.kernel.org>, <tangchen@...fujitsu.com>,
	<wency@...fujitsu.com>, <laijs@...fujitsu.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Bug fix PATCH v2 1/2] ACPI,acpi_memhotplug: enable acpi_memory_info->enabled
 of memory device presented at boot-time

The mail's tab become spaces. So I attached origianl patch.

Thanks,
Yasuaki Ishimatsu

2013/03/21 13:36, Yasuaki Ishimatsu wrote:
> At http://marc.info/?l=linux-acpi&m=135769405622667&w=2 thread,
> Toshi Kani mentioned as follows:
>
> "I have a question about the change you made in commit 65479472 in
> acpi_memhotplug.c.  This change seems to require that
> acpi_memory_enable_device() calls add_memory() to add all memory ranges
> represented by memory device objects at boot-time, and keep the results
> be used for hot-remove.
>
> If I understand it right, this add_memory() call fails with EEXIST at
> boot-time since all memory ranges should have been added from EFI memory
> table (or e820) already.  This results all memory ranges be marked as !
> enabled & !failed.  I think this means that we cannot hot-delete any
> memory ranges presented at boot-time since acpi_memory_remove_memory()
> only calls remove_memory() when the enabled flag is set.  Is that
> correct?"
>
> Above mention is correct. Thus even if memory device supports hotplug,
> memory presented at boot-time cannot be hot removed since the memory
> device's acpi_memory_info->enabled is always 0.
>
> This patch changes to set 1 to "acpi_memory_info->enabled" of memory
> device presented at boot-time for hot removing the memory device.
>
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> ---
>
> v2 : Changed a based kernel from linux-3.9-rc2 to linux-pm.git/bleeding-edge.
>
> ---
>   drivers/acpi/acpi_memhotplug.c |    4 ++--
>   1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index d4f2eb8..ea78988 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -206,8 +206,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
>               continue;
>           }
>
> -        if (!result)
> -            info->enabled = 1;
> +        info->enabled = 1;
> +
>           /*
>            * Add num_enable even if add_memory() returns -EEXIST, so the
>            * device is bound to this driver.
>
> --
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View attachment "0001-ACPI-acpi_memhotplug-enable-acpi_memory_info-enabled.patch" of type "text/x-patch" (1877 bytes)