Oleg Nesterov 6f35c4abd7 PM / Freezer: Reimplement wait_event_freezekillable using freezer_do_not_count/freezer_count ... Commit 27920651fe "PM / Freezer: Make fake_signal_wake_up() wake TASK_KILLABLE tasks too" updated fake_signal_wake_up() used by freezer to wake up KILLABLE tasks. Sending unsolicited wakeups to tasks in killable sleep is dangerous as there are code paths which depend on tasks not waking up spuriously from KILLABLE sleep. For example. sys_read() or page can sleep in TASK_KILLABLE assuming that wait/down/whatever _killable can only fail if we can not return to the usermode. TASK_TRACED is another obvious example. The offending commit was to resolve freezer hang during system PM operations caused by KILLABLE sleeps in network filesystems. wait_event_freezekillable(), which depends on the spurious KILLABLE wakeup, was added by f06ac72e92 "cifs, freezer: add wait_event_freezekillable and have cifs use it" to be used to implement killable & freezable sleeps in network filesystems. To prepare for reverting of 27920651fe, this patch reimplements wait_event_freezekillable() using freezer_do_not_count/freezer_count() so that it doesn't depend on the spurious KILLABLE wakeup. This isn't very nice but should do for now. [tj: Refreshed patch to apply to linus/master and updated commit description on Rafael's request.] Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>		2011-11-04 22:28:15 +01:00
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acpi	PCI hotplug: acpiphp: Prevent deadlock on PCI-to-PCI bridge remove	2011-10-14 09:05:31 -07:00
asm-generic	Merge Qualcom Hexagon architecture	2011-11-01 07:48:13 -07:00
crypto	crypto: Add a report function pointer to crypto_type	2011-10-21 14:24:03 +02:00
drm	treewide: use __printf not __attribute__((format(printf,...)))	2011-10-31 17:30:54 -07:00
keys
linux	PM / Freezer: Reimplement wait_event_freezekillable using freezer_do_not_count/freezer_count	2011-11-04 22:28:15 +01:00
math-emu
media	[media] vb2: add vb2_get_unmapped_area in vb2 core	2011-11-03 18:29:13 -02:00
misc	[media] altera-stapl: it is time to move out from staging	2011-09-23 15:00:57 -03:00
mtd
net	net: make the tcp and udp file_operations for the /proc stuff const	2011-11-01 17:56:14 -04:00
pcmcia
rdma	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband	2011-11-01 10:51:38 -07:00
rxrpc
scsi	Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6	2011-10-28 16:44:18 -07:00
sound	treewide: use __printf not __attribute__((format(printf,...)))	2011-10-31 17:30:54 -07:00
target	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2011-10-25 12:11:02 +02:00
trace	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4	2011-11-02 10:06:20 -07:00
video	Merge branch 'for-florian' of git://gitorious.org/linux-omap-dss2/linux into fbdev-next	2011-10-15 00:19:52 +00:00
xen	treewide: use __printf not __attribute__((format(printf,...)))	2011-10-31 17:30:54 -07:00
Kbuild