linux-kernel - Re: [PATCH] ACPI / scan: Make it clear that acpi_bus

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Message-ID: <20130218122549.GA4448@dhcp-192-168-178-175.profitbricks.localdomain>
Date:	Mon, 18 Feb 2013 13:25:49 +0100
From:	Vasilis Liaskovitis <vasilis.liaskovitis@...fitbricks.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Toshi Kani <toshi.kani@...com>, Jiang Liu <liuj97@...il.com>,
	wency@...fujitsu.com
Subject: Re: [PATCH] ACPI / scan: Make it clear that acpi_bus_trim() cannot
 fail

Hi,

On Thu, Jan 24, 2013 at 11:56:50PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Since acpi_bus_trim() cannot fail, change its definition to a void
> function, so that its callers don't check the return value in vain
> and update the callers.

I have missed a few patchsets/discussions in the last month and wanted to
ask a question related to this: Does the new always-succeed 2-pass
trim_device design guarantee safe memory hot-remove operations?

Afaict if memory offline fails now, the device is ejected (_EJ0) anyways
causing a panic. Tested in a VM with linux-next-20130207 and
linux-next-20130218 by doing an SCI-eject request on a hot-plugged dimm.

Are there more patches in development for safe memory hot-remove?

thanks,

- Vasilis
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