linux/drivers/media/dvb
Rafael J. Wysocki 8314418629 Freezer: make kernel threads nonfreezable by default
Currently, the freezer treats all tasks as freezable, except for the kernel
threads that explicitly set the PF_NOFREEZE flag for themselves.  This
approach is problematic, since it requires every kernel thread to either
set PF_NOFREEZE explicitly, or call try_to_freeze(), even if it doesn't
care for the freezing of tasks at all.

It seems better to only require the kernel threads that want to or need to
be frozen to use some freezer-related code and to remove any
freezer-related code from the other (nonfreezable) kernel threads, which is
done in this patch.

The patch causes all kernel threads to be nonfreezable by default (ie.  to
have PF_NOFREEZE set by default) and introduces the set_freezable()
function that should be called by the freezable kernel threads in order to
unset PF_NOFREEZE.  It also makes all of the currently freezable kernel
threads call set_freezable(), so it shouldn't cause any (intentional)
change of behaviour to appear.  Additionally, it updates documentation to
describe the freezing of tasks more accurately.

[akpm@linux-foundation.org: build fixes]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Nigel Cunningham <nigel@nigel.suspend2.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-17 10:23:02 -07:00
..
b2c2 V4L/DVB (5761): Fix broken b2c2 dependency on non x86 architectures 2007-06-08 08:54:39 -03:00
bt8xx V4L/DVB (5639a): Fix dst usage count 2007-05-22 16:00:14 -03:00
cinergyT2 V4L/DVB (5818): CinergyT2: fix flush_workqueue() vs work->func() deadlock 2007-07-03 15:11:19 -03:00
dvb-core Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
dvb-usb Merge branch 'master' of ssh://master.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb 2007-05-11 12:57:16 -07:00
frontends V4L/DVB (5716): Tda10086,tda826x: fix tuning, STR/SNR values 2007-06-08 08:21:13 -03:00
pluto2 V4L/DVB (5578): Workaround for bad hardare/firmware on some pluto2 devices 2007-05-09 10:12:35 -03:00
ttpci V4L/DVB (5822): Fix the return value in ttpci_budget_init() 2007-07-03 15:11:21 -03:00
ttusb-budget V4L/DVB (5361): Dvb-pll: Fix Kconfig files and allow dvb-pll to be optional 2007-04-27 15:44:01 -03:00
ttusb-dec V4L/DVB (5164): Compat: Handle input_register_device() change and some others 2007-02-21 13:35:10 -02:00
Kconfig Fix Kconfig dependency problems wrt boolean menuconfigs 2007-06-28 11:34:53 -07:00
Makefile