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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <9589253.Co8jZpnWdd@vostro.rjw.lan>
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/