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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