linux-kernel - Re: [PATCH] X86/acpi: remove redundant logic of acpi memory hotadd

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Message-ID: <4326596.xCAz7vOgOp@vostro.rjw.lan>
Date:	Fri, 07 Dec 2012 23:19:29 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Liu, Jinsong" <jinsong.liu@...el.com>,
	Toshi Kani <toshi.kani@...com>,
	Wen Congyang <wency@...fujitsu.com>
Cc:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jiang Liu <jiang.liu@...wei.com>
Subject: Re: [PATCH] X86/acpi: remove redundant logic of acpi memory hotadd

On Tuesday, December 04, 2012 01:39:54 AM Liu, Jinsong wrote:
> Resend it, add Rafael and linux-acpi@...r.kernel.org

I wonder what memory hotplug people think about that.

Thanks,
Rafael


> ===============
> From 1d39279e45c54ce531691da5ffe261e7689dd92c Mon Sep 17 00:00:00 2001
> From: Liu Jinsong <jinsong.liu@...el.com>
> Date: Wed, 14 Nov 2012 18:52:06 +0800
> Subject: [PATCH] X86/acpi: remove redundant logic of acpi memory hotadd
> 
> When memory hotadd, acpi_memory_enable_device has already been done
> at drv->ops.add (acpi_memory_device_add), no need to do it again
> at notify callback.
> 
> At acpi_memory_enable_device, acpi_memory_get_device_resources
> is also a redundant action, since it has been done at drv->ops.add.
> 
> Signed-off-by: Liu Jinsong <jinsong.liu@...el.com>
> ---
>  drivers/acpi/acpi_memhotplug.c |   17 -----------------
>  1 files changed, 0 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index 24c807f..a6489fd 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -220,15 +220,6 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
>  	struct acpi_memory_info *info;
>  	int node;
>  
> -
> -	/* Get the range from the _CRS */
> -	result = acpi_memory_get_device_resources(mem_device);
> -	if (result) {
> -		printk(KERN_ERR PREFIX "get_device_resources failed\n");
> -		mem_device->state = MEMORY_INVALID_STATE;
> -		return result;
> -	}
> -
>  	node = acpi_get_node(mem_device->device->handle);
>  	/*
>  	 * Tell the VM there is more memory here...
> @@ -357,14 +348,6 @@ static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
>  			break;
>  		}
>  
> -		if (acpi_memory_check_device(mem_device))
> -			break;
> -
> -		if (acpi_memory_enable_device(mem_device)) {
> -			printk(KERN_ERR PREFIX "Cannot enable memory device\n");
> -			break;
> -		}
> -
>  		ost_code = ACPI_OST_SC_SUCCESS;
>  		break;
>  
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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