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linux/drivers/media/video
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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
..
bt8xx V4L/DVB (5808): Bttv: fix v4l1 breaking the driver 2007-07-03 15:11:14 -03:00
cpia2
cx88 Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
cx25840 V4L/DVB (5576): Improve / fix support for PAL-60 in cx25840 2007-05-09 10:12:34 -03:00
em28xx V4L/DVB (5640): Fix: em28xx shouldn't be selecting VIDEO_BUF 2007-05-22 16:00:12 -03:00
et61x251 V4L/DVB (5586): Use menuconfig objects II - V4L 2007-05-09 10:12:39 -03:00
ivtv V4L/DVB (5751): Ivtv: fix ia64 printk format warnings. 2007-06-08 08:54:41 -03:00
ovcamchip i2c: Cleanup the includes of <linux/i2c.h> 2007-05-01 23:26:29 +02:00
pvrusb2 V4L/DVB (5586): Use menuconfig objects II - V4L 2007-05-09 10:12:39 -03:00
pwc Merge branch 'master' of ssh://master.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb 2007-05-11 12:57:16 -07:00
saa7134 saa7134: fix thread shutdown handling 2007-06-28 11:34:54 -07:00
sn9c102 V4L/DVB (5586): Use menuconfig objects II - V4L 2007-05-09 10:12:39 -03:00
usbvideo Merge branch 'master' of ssh://master.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb 2007-05-11 12:57:16 -07:00
usbvision V4L/DVB (5720): Usbvision: fix urb allocation and submits 2007-06-08 08:21:14 -03:00
zc0301 V4L/DVB (5586): Use menuconfig objects II - V4L 2007-05-09 10:12:39 -03:00
adv7170.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
adv7175.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
arv.c
bt819.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
bt856.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
bt866.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
btcx-risc.c
btcx-risc.h
bw-qcam.c
bw-qcam.h
c-qcam.c
cafe_ccic-regs.h V4L/DVB (5690): Cafe_ccic: Properly power down the sensor 2007-05-22 16:16:27 -03:00
cafe_ccic.c V4L/DVB (5690): Cafe_ccic: Properly power down the sensor 2007-05-22 16:16:27 -03:00
compat_ioctl32.c
cpia_pp.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
cpia_usb.c
cpia.c
cpia.h header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
cs53l32a.c V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
cs8420.h
cx2341x.c i2c: Cleanup the includes of <linux/i2c.h> 2007-05-01 23:26:29 +02:00
dabfirmware.h
dabusb.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
dabusb.h
dpc7146.c
font.h
hexium_gemini.c
hexium_orion.c
ibmmpeg2.h
indycam.c
indycam.h
ir-kbd-i2c.c V4L/DVB (5479): Use ARRAY_SIZE instead of a magic number 2007-04-27 15:45:12 -03:00
Kconfig Fix Kconfig dependency problems wrt boolean menuconfigs 2007-06-28 11:34:53 -07:00
ks0127.c
ks0127.h
Makefile
meye.c PCI: Change all drivers to use pci_device->revision 2007-07-11 16:02:10 -07:00
meye.h meye: make meye use sony-laptop instead of sonypi 2007-04-28 22:06:02 -04:00
msp3400-driver.c V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
msp3400-driver.h V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
msp3400-kthreads.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
mt20xx.c
mxb.c
mxb.h
ov511.c
ov511.h header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
ov7670.c V4L/DVB (5691): Ov7670: reset clkrc in rgb565 mode 2007-05-22 16:16:29 -03:00
planb.c Merge branch 'linux-2.6' into for-2.6.22 2007-04-30 12:38:01 +10:00
planb.h V4L/DVB (5551): Plan-b: header change 2007-04-27 15:45:53 -03:00
pms.c
saa711x_regs.h
saa711x.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
saa5246a.c
saa5246a.h
saa5249.c
saa6588.c
saa7110.c
saa7111.c V4L/DVB (5700): Saa7111: fix picture settings cache bug 2007-06-08 08:21:12 -03:00
saa7114.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
saa7115.c V4L/DVB (5414): Add missing kfree in early exit of saa7115. 2007-04-27 15:44:31 -03:00
saa7121.h
saa7127.c
saa7146.h
saa7146reg.h
saa7185.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
saa7191.c
saa7191.h
saa7196.h
se401.c V4L/DVB (5490): Drivers/media/video/se401.c: check kmalloc() return value. 2007-04-27 15:45:21 -03:00
se401.h header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
stradis.c
stv680.c
stv680.h
tda7432.c V4L/DVB (5492): Remove useless includes of i2c-algo-bit.h 2007-04-27 15:45:23 -03:00
tda8290.c V4L/DVB (5484): Set tda8290 to analog mode after init 2007-04-27 15:45:15 -03:00
tda9840.c
tda9840.h
tda9875.c V4L/DVB (5492): Remove useless includes of i2c-algo-bit.h 2007-04-27 15:45:23 -03:00
tda9887.c
tea5767.c
tea6415c.c
tea6415c.h
tea6420.c
tea6420.h
tlv320aic23b.c
tuner-3036.c
tuner-core.c
tuner-simple.c V4L/DVB (5680): Tuner-simple.c fix suport for SECAM with FI1216MF 2007-05-22 16:16:25 -03:00
tuner-types.c
tvaudio.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
tveeprom.c V4L/DVB (5434): Updates to the tveeprom tuner, video decoder and audio chip 2007-04-27 15:44:45 -03:00
tvmixer.c
tvp5150_reg.h
tvp5150.c
upd64031a.c V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
upd64083.c V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
v4l1-compat.c V4L/DVB (5571): V4l1-compat: Make VIDIOCSPICT return errors in a useful way 2007-05-09 10:13:09 -03:00
v4l2-common.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
video-buf-dvb.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
video-buf.c V4L/DVB (5603): V4L: Prevent queueing queued buffers. 2007-05-09 10:12:56 -03:00
videocodec.c V4L/DVB (5489): Codec.c: check kmalloc() return value. 2007-04-27 15:45:20 -03:00
videocodec.h
videodev.c V4L/DVB (5617): V4L2: videodev, allow debugging 2007-05-09 10:13:04 -03:00
vino.c
vino.h
vivi.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
vpx3220.c
w9966.c
w9968cf_decoder.h
w9968cf_vpp.h
w9968cf.c
w9968cf.h
wm8739.c V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
wm8775.c V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
zoran_card.c
zoran_card.h
zoran_device.c
zoran_device.h
zoran_driver.c Clean up mutex_trylock noise 2007-05-08 11:15:13 -07:00
zoran_procfs.c
zoran_procfs.h
zoran.h
zr364xx.c V4L/DVB (5392): Zr364xx: Use kernel's byte-swapping function 2007-04-27 15:44:19 -03:00
zr36016.c
zr36016.h
zr36050.c
zr36050.h
zr36057.h
zr36060.c
zr36060.h