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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 [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
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
Kconfig Fix Kconfig dependency problems wrt boolean menuconfigs 2007-06-28 11:34:53 -07:00
Makefile V4L/DVB (5345): ivtv driver for Conexant cx23416/cx23415 MPEG encoder/decoder 2007-04-27 15:43:50 -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 [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
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 V4L/DVB (3355): removed uneeded init on structs like static int foo=0 2006-01-13 14:10:19 -02:00
btcx-risc.h [PATCH] v4l: common part Updates and tuner additions 2005-09-09 13:57:49 -07:00
bw-qcam.c [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
bw-qcam.h V4L/DVB (3318b): sem2mutex: drivers/media/, #2 2006-02-07 06:49:14 -02:00
c-qcam.c [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
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 [PATCH] struct path: convert v4l 2006-12-08 08:28:50 -08:00
cpia.c V4L/DVB (5076): Cpia.c: buffer overflow 2007-02-21 13:34:35 -02:00
cpia.h header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
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 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
cs53l32a.c V4L/DVB (5355): Add VIDIOC_G_CHIP_IDENT to various i2c modules 2007-04-27 15:43:50 -03:00
cs8420.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
cx2341x.c i2c: Cleanup the includes of <linux/i2c.h> 2007-05-01 23:26:29 +02:00
dabfirmware.h V4L/DVB (3599a): Move drivers/usb/media to drivers/media/video 2006-03-25 09:29:04 -03:00
dabusb.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
dabusb.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
dpc7146.c V4L/DVB (3537a): Whitespace cleanup 2006-03-21 08:53:57 -08:00
font.h V4L/DVB (3518): Creates a virtual video device driver 2006-03-24 16:26:49 -03:00
hexium_gemini.c V4L/DVB (3537a): Whitespace cleanup 2006-03-21 08:53:57 -08:00
hexium_orion.c V4L/DVB (3537a): Whitespace cleanup 2006-03-21 08:53:57 -08:00
ibmmpeg2.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
indycam.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
indycam.h VINO driver version 0.0.5. 2005-11-07 18:05:41 +00:00
ir-kbd-i2c.c V4L/DVB (5479): Use ARRAY_SIZE instead of a magic number 2007-04-27 15:45:12 -03:00
ks0127.c V4L/DVB (5029): Ks0127 status flags 2007-01-15 16:25:52 -02:00
ks0127.h V4L/DVB (3916): AverMedia 6 Eyes AVS6EYES support 2006-06-25 01:59:28 -03:00
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 V4L/DVB (3384): Separate tv & radio freqs, fix cb/freq transmit order for tuners that need this. 2006-01-15 21:25:32 -02:00
mxb.c V4L/DVB (4894): Mxb: fix to load the proper i2c modules 2006-12-10 09:05:26 -02:00
mxb.h V4L/DVB (3537a): Whitespace cleanup 2006-03-21 08:53:57 -08:00
ov511.c [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
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 [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
saa711x.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
saa711x_regs.h V4L/DVB (4551): Added register aliases for saa711x registers, instead of using reg numbers 2006-09-26 12:30:34 -03:00
saa5246a.c V4L/DVB (5197): Convert to generic boolean-values 2007-02-21 13:35:16 -02:00
saa5246a.h V4L/DVB (5197): Convert to generic boolean-values 2007-02-21 13:35:16 -02:00
saa5249.c V4L/DVB (5197): Convert to generic boolean-values 2007-02-21 13:35:16 -02:00
saa6588.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2006-12-05 14:37:56 +00:00
saa7110.c V4L/DVB (4068): Removed all references to kernel stuff from videodev.h and videodev2.h 2006-06-25 02:05:05 -03:00
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 V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
saa7127.c V4L/DVB (5306): Add support for VIDIOC_G_CHIP_IDENT 2007-04-27 15:43:27 -03:00
saa7146.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
saa7146reg.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
saa7185.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
saa7191.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
saa7191.h VINO driver version 0.0.5. 2005-11-07 18:05:41 +00:00
saa7196.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
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 [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
stv680.c [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
stv680.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
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 V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
tda9840.h V4L/DVB (3548): Renamed I2C_foo addresses to I2C_ADDR_foo 2006-03-24 16:26:51 -03:00
tda9875.c V4L/DVB (5492): Remove useless includes of i2c-algo-bit.h 2007-04-27 15:45:23 -03:00
tda9887.c V4L/DVB (4934): Usbvision radio requires GainNormal at e register 2006-12-10 09:05:51 -02:00
tea5767.c V4L/DVB (3715): Change all emails to the currently used one. 2006-06-25 01:57:39 -03:00
tea6415c.c V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
tea6415c.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tea6420.c V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
tea6420.h V4L/DVB (3548): Renamed I2C_foo addresses to I2C_ADDR_foo 2006-03-24 16:26:51 -03:00
tlv320aic23b.c V4L/DVB (4048): Add support for the Texas Instruments TLV320AIC23B audio codec 2006-06-25 02:05:00 -03:00
tuner-3036.c V4L/DVB (4068): Removed all references to kernel stuff from videodev.h and videodev2.h 2006-06-25 02:05:05 -03:00
tuner-core.c V4L/DVB (5326): Allow to set tuner_config in attach inform 2007-04-27 15:43:42 -03:00
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 V4L/DVB (4936): Make MT4049FM5 tuner to set FM Gain to Normal 2006-12-10 09:05:53 -02:00
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 V4L/DVB (5028): Tvmixer module_put cleanup 2007-02-21 13:34:18 -02:00
tvp5150.c V4L/DVB (5304): Improve chip matching in v4l2_register 2007-03-01 13:09:44 -02:00
tvp5150_reg.h V4L/DVB (3408): Included new sliced VBI types to videodev2.h and tvp5150 2006-01-23 17:11:05 -02:00
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 V4L/DVB (4269): Subject: videocodec: make 1-bit fields unsigned 2006-06-30 15:59:30 -03:00
videodev.c V4L/DVB (5617): V4L2: videodev, allow debugging 2007-05-09 10:13:04 -03:00
vino.c [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
vino.h [PATCH] Indycam / VINO drivers 2005-09-07 16:58:01 -07:00
vivi.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
vpx3220.c V4L/DVB (4515): Fixed module name, since it is, in fact, a decoder. 2006-09-26 12:30:32 -03:00
w9966.c [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
w9968cf.c i2c: Declare more i2c_adapter parent devices 2007-02-13 22:09:03 +01:00
w9968cf.h Remove obsolete #include <linux/config.h> 2006-06-30 19:25:36 +02:00
w9968cf_decoder.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
w9968cf_vpp.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
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.h V4L/DVB (4605): Fixes an issue with V4L1 and make headers-install 2006-09-10 13:45:55 -03:00
zoran_card.c i2c: Declare more i2c_adapter parent devices 2007-02-13 22:09:03 +01:00
zoran_card.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
zoran_device.c V4L/DVB (4964): VIDEO_PALETTE_YUYV and VIDEO_PALETTE_YUV422 are the same palette 2006-12-27 14:18:50 -02:00
zoran_device.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
zoran_driver.c Clean up mutex_trylock noise 2007-05-08 11:15:13 -07:00
zoran_procfs.c [PATCH] mark struct file_operations const 4 2007-02-12 09:48:45 -08:00
zoran_procfs.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
zr364xx.c V4L/DVB (5392): Zr364xx: Use kernel's byte-swapping function 2007-04-27 15:44:19 -03:00
zr36016.c V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
zr36016.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
zr36050.c V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
zr36050.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
zr36057.h V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
zr36060.c V4L/DVB (3599b): Whitespace cleanups under drivers/media 2006-03-25 09:29:23 -03:00
zr36060.h Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00