linux-kernel - [PATCH 0/3] ACPI / hotplug / mm: Rework mutual exclusion between hibernation and memory hotplug

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Date:	Thu, 29 Aug 2013 23:12:53 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc:	Toshi Kani <toshi.kani@...com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	linux-mm@...ck.org
Subject: [PATCH 0/3] ACPI / hotplug / mm: Rework mutual exclusion between hibernation and memory hotplug

Hi All,

One thing that bothers me quite a bit about memory hotplug is that
lock_hotplug_memory() acquires pm_mutex which is kind of a blunt thing
and has a huge potential for deadlocks.

This can be avoided if device_hotplug_lock is held around hibernation,
which is not too difficult to make happen and hence the following patch
series.

[1/3] ACPI: Acquire device_hotplug_lock before acpi_scan_lock (this is
      necessary, because hibernation acquires acpi_scan_lock in linux-next).

[2/3] PM / hibernate: Allocate memory bitmaps after freezing user space
      processes (the reason why is explained in the changelog).

[3/3] Rework mutual exclusion between hibernation and memory hotplug.

On top of linux-pm.git/linux-next.

Thanks,
Rafael

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