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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
..
aacraid Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
aic7xxx Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
aic7xxx_old
aic94xx PCI: Change all drivers to use pci_device->revision 2007-07-11 16:02:10 -07:00
arcmsr Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
arm [ARM] ecard: add ecardm_iomap() / ecardm_iounmap() 2007-05-11 17:19:02 +01:00
dpt [SCSI] dpt: whitespace cleanup 2007-04-01 10:10:04 -05:00
ibmvscsi [SCSI] ibmvscsi: convert to use the data buffer accessors 2007-07-15 10:05:33 -05:00
libsas Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
lpfc Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
megaraid [SCSI] megaraid_mbox: use mutex instead of semaphore 2007-07-14 19:10:19 -05:00
pcmcia [SCSI] sym53c500_cs: convert to use the data buffer accessors 2007-05-26 19:09:22 -05:00
qla2xxx Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
qla4xxx [SCSI] qla4xxx: Fix underrun/overrun conditions 2007-07-14 19:11:38 -05:00
sym53c8xx_2 [SCSI] sym53c8xx: convert to use the data buffer accessors 2007-07-15 10:00:32 -05:00
.gitignore
3w-9xxx.c [SCSI] 3w-9xxx: eliminate missed map_single path 2007-05-31 08:23:02 -05:00
3w-9xxx.h
3w-xxxx.c [SCSI] 3w-xxxx: convert to use the data buffer accessors 2007-05-30 23:29:32 -05:00
3w-xxxx.h [SCSI] 3ware 8000 serialize reset code 2007-01-06 09:18:00 -06:00
53c700_d.h_shipped
53c700.c [SCSI] 53c700: Remove printk, which triggers because of low scsi clock on SNI RMs 2007-07-14 19:12:43 -05:00
53c700.h [SCSI] 53c700: m68k support for the 53c700 SCSI core 2007-06-17 16:15:56 -05:00
53c700.scr
a100u2w.c [SCSI] a100u2w: Convert into Linux style 2007-06-17 16:09:29 -05:00
a100u2w.h [SCSI] a100u2w: Convert into Linux style 2007-06-17 16:09:29 -05:00
a2091.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
a2091.h
a3000.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
a3000.h
a4000t.c [SCSI] 53c700: Fixup m68k drivers: 2007-06-19 19:53:35 -07:00
advansys.c [SCSI] advansys: cleanups 2007-05-27 15:05:10 -05:00
aha152x.c [SCSI] aha152x: use wait_for_completion_timeout 2007-05-22 10:50:19 -05:00
aha152x.h
aha1542.c PCI: Cleanup the includes of <linux/pci.h> 2007-05-02 19:02:35 -07:00
aha1542.h
aha1740.c [SCSI] aha1740: convert to use the data buffer accessors 2007-05-26 19:12:56 -05:00
aha1740.h
aic7xxx_old.c [SCSI] aic7xxx_old: remove redundant GFP_ATOMIC from kmalloc 2007-07-15 09:34:45 -05:00
atari_dma_emul.c
atari_NCR5380.c [SCSI] atari_NCR5380: update_timeout removal 2007-06-04 09:55:15 -05:00
atari_scsi.c m68k: Atari SCSI driver compile fixes 2007-05-04 17:59:05 -07:00
atari_scsi.h m68k: Atari SCSI driver compile fixes 2007-05-04 17:59:05 -07:00
atp870u.c
atp870u.h
blz1230.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
blz2060.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
BusLogic.c [SCSI] BusLogic: convert to use the data buffer accessors 2007-05-26 19:21:37 -05:00
BusLogic.h [SCSI] BusLogic: Replace 'boolean' by 'bool' 2007-02-07 18:32:29 -05:00
bvme6000_scsi.c [SCSI] 53c700: Fixup m68k drivers: 2007-06-19 19:53:35 -07:00
ch.c [SCSI] ch: kmalloc/memset->kzalloc 2007-05-06 09:33:11 -05:00
constants.c [SCSI] constants.c: Update ASC list and make it const 2007-03-11 11:21:25 -05:00
cyberstorm.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
cyberstormII.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
dc395x.c [SCSI] dc395x: convert to use the data buffer accessors 2007-07-15 10:04:49 -05:00
dc395x.h
dec_esp.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
dmx3191d.c
dpt_i2o.c [SCSI] dpt_i2o: convert to use the data buffer accessors 2007-05-31 12:25:27 -05:00
dpti.h
dtc.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
dtc.h
eata_generic.h [SCSI] eata_pio: Remove FALSE/TRUE defines 2007-03-20 11:27:03 -05:00
eata_pio.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
eata_pio.h
eata.c [SCSI] eata: convert to use the data buffer accessors 2007-05-26 19:13:55 -05:00
esp_scsi.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
esp_scsi.h [SCSI] esp: use shost_priv 2007-05-31 17:30:04 -04:00
fastlane.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
fcal.c
fcal.h
fd_mcs.c
fdomain.c [SCSI] fdomain: fix PCMCIA-related warnings 2007-05-27 12:59:28 -05:00
fdomain.h
FlashPoint.c [SCSI] BusLogic: Replace 'boolean' by 'bool' 2007-02-07 18:32:29 -05:00
g_NCR5380_mmio.c
g_NCR5380.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
g_NCR5380.h
gdth_ioctl.h
gdth_kcompat.h
gdth_proc.c
gdth_proc.h
gdth.c [SCSI] gdth: Fix obvious typo "spin_lock_irqrestore()" 2007-05-30 08:39:52 -05:00
gdth.h
gvp11.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
gvp11.h
hosts.c SCSI: use the proper semaphore to protect the class lists 2007-04-27 10:57:30 -07:00
hptiop.c [SCSI] hptiop: convert to use the data buffer accessors 2007-06-17 18:35:14 -05:00
hptiop.h
ibmmca.c [SCSI] ibmmca: convert to use the data buffer accessors 2007-05-26 16:30:17 -05:00
ide-scsi.c ide-scsi: fix OOPS in idescsi_expiry() 2007-06-16 02:24:44 +02:00
imm.c
imm.h
in2000.c
in2000.h
initio.c [SCSI] initio: convert to use the data buffer accessors 2007-05-26 19:13:27 -05:00
initio.h [SCSI] initio: Convert into a real Linux driver and update to modern style 2007-05-22 11:08:56 -05:00
ipr.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
ipr.h [SCSI] ipr: Use PCI-E reset API for new ipr adapter 2007-05-08 11:54:40 -05:00
ips.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
ips.h [SCSI] ips: remove kernel 2.4 code 2007-05-24 09:14:41 -05:00
iscsi_tcp.c [SCSI] iscsi_tcp: convert to use the data buffer accessors 2007-06-17 16:01:55 -05:00
iscsi_tcp.h [SCSI] iscsi_tcp: fix handling of data buffer padding 2007-06-02 15:35:10 -04:00
jazz_esp.c [SCSI] esp: use shost_priv 2007-05-31 17:30:04 -04:00
Kconfig Introduce CONFIG_VIRT_TO_BUS 2007-07-16 09:05:42 -07:00
lasi700.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
libiscsi.c [SCSI] iscsi_tcp: convert to use the data buffer accessors 2007-06-17 16:01:55 -05:00
libsrp.c [SCSI] tgt: fix a rdma indirect transfer error bug 2007-05-16 12:45:17 -04:00
mac53c94.c [SCSI] mac53c94: convert to use the data buffer accessors 2007-05-26 19:07:50 -05:00
mac53c94.h
mac_esp.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
mac_scsi.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
mac_scsi.h
Makefile [SCSI] don't build scsi_dma_{map,unmap} for !HAS_DMA 2007-07-14 19:28:10 -05:00
mca_53c9x.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
megaraid.c [SCSI] megaraid_old: convert to use the data buffer accessors 2007-05-31 18:11:21 -04:00
megaraid.h [SCSI] megaraid: fix warnings when CONFIG_PROC_FS=n 2007-05-08 11:15:08 -05:00
mesh.c [SCSI] mesh: convert to use the data buffer accessors 2007-06-07 08:49:10 -05:00
mesh.h
mvme16x_scsi.c [SCSI] 53c700: m68k MVME16x NCR53C710 SCSI 2007-06-17 16:17:40 -05:00
mvme147.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
mvme147.h
ncr53c8xx.c [SCSI] ncr53c8xx: convert to use the data buffer accessors 2007-07-15 10:03:03 -05:00
ncr53c8xx.h
NCR53c406a.c [SCSI] NCR53c406a: convert to use the data buffer accessors 2007-05-26 19:08:20 -05:00
NCR53C9x.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
NCR53C9x.h [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
NCR5380.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
NCR5380.h [SCSI] ncr5380 warning fixes 2007-05-24 09:13:25 -05:00
NCR_D700.c [SCSI] NCR_D700: fix compile error 2007-01-27 09:28:58 -06:00
NCR_D700.h
NCR_Q720.c
NCR_Q720.h
nsp32_debug.c
nsp32_io.h
nsp32.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
nsp32.h
oktagon_esp.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
oktagon_io.S
osst_detect.h
osst_options.h
osst.c [SCSI] modalias for scsi devices 2007-04-17 18:15:04 -04:00
osst.h [PATCH] osst endianness annotations 2007-02-09 09:14:07 -08:00
pas16.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
pas16.h
pluto.c [SCSI] pluto: Use wait_for_completion_timeout. 2007-05-29 02:49:05 -07:00
pluto.h
ppa.c [SCSI] ppa: coding police and printk levels 2007-07-15 09:36:25 -05:00
ppa.h
psi240i.c
psi240i.h
psi_chip.h
ql1040_fw.h
ql1280_fw.h
ql12160_fw.h
qla1280.c [SCSI] qla1280: use DMA_64BIT_MASK instead of ~ 0ULL 2007-05-06 09:33:11 -05:00
qla1280.h
qlogicfas408.c [SCSI] qlogicfas408: convert to use the data buffer accessors 2007-05-26 19:21:09 -05:00
qlogicfas408.h
qlogicfas.c
qlogicpti_asm.c
qlogicpti.c [SPARC/64] constify of_get_property return: drivers 2007-04-26 01:54:27 -07:00
qlogicpti.h
raid_class.c
script_asm.pl
scsi_debug.c [SCSI] scsi_debug: correct parameter default text 2007-06-17 14:56:07 -05:00
scsi_debug.h
scsi_devinfo.c [SCSI] Add Brownie 1200U3P to blacklist 2007-07-14 18:58:37 -05:00
scsi_error.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
scsi_ioctl.c
scsi_lib_dma.c [SCSI] don't build scsi_dma_{map,unmap} for !HAS_DMA 2007-07-14 19:28:10 -05:00
scsi_lib.c [SCSI] don't build scsi_dma_{map,unmap} for !HAS_DMA 2007-07-14 19:28:10 -05:00
scsi_logging.h
scsi_module.c
scsi_netlink.c [NETLINK]: Switch cb_lock spinlock to mutex and allow to override it 2007-04-25 22:29:03 -07:00
scsi_priv.h [SCSI] scsi_error.c: Export some scsi_eh_* functions 2007-01-27 10:06:34 -06:00
scsi_proc.c [SCSI] scsi_proc.c: display sdev->scsi_level correctly 2007-02-16 11:12:07 -06:00
scsi_sas_internal.h
scsi_scan.c Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-15 16:51:54 -07:00
scsi_sysctl.c [PATCH] sysctl: remove insert_at_head from register_sysctl 2007-02-14 08:09:59 -08:00
scsi_sysfs.c [SCSI] kill scsi host template suspend/resume 2007-05-22 10:41:12 -05:00
scsi_tgt_if.c [SCSI] tgt: fix sesnse buffer problems 2007-03-11 11:39:27 -05:00
scsi_tgt_lib.c [SCSI] tgt: remove the code to build sense 2007-03-20 10:52:59 -05:00
scsi_tgt_priv.h [SCSI] tgt: fix sesnse buffer problems 2007-03-11 11:39:27 -05:00
scsi_transport_api.h
scsi_transport_fc.c [SCSI] fc_transport: Check portstates before invoking target scan 2007-06-17 16:03:11 -05:00
scsi_transport_iscsi.c [SCSI] iscsi class, iscsi_tcp, iser, qla4xxx: add netdevname sysfs attr 2007-06-02 15:38:04 -04:00
scsi_transport_sas.c Fix typos concerning hierarchy 2007-02-17 19:23:03 +01:00
scsi_transport_spi.c [SCSI] spi transport class: export spi_dv_pending 2007-02-02 20:44:25 -06:00
scsi_typedefs.h
scsi_wait_scan.c
scsi.c [SCSI] scsi.c: convert to use the data buffer accessors 2007-07-14 18:57:54 -05:00
scsi.h
scsicam.c
sd.c bsg: add a request_queue argument to scsi_cmd_ioctl() 2007-07-16 08:52:45 +02:00
seagate.c [SCSI] seagate: remove BROKEN tag 2007-01-03 16:57:38 -06:00
sg.c [SCSI] sg: remove unnecessary check 2007-05-28 09:08:32 -05:00
sgiwd93.c Convert SGI IP22 and specific drivers to platform_device. 2007-05-11 17:00:29 +01:00
sim710.c [SCSI] 53c700: Allow setting burst length 2007-01-13 13:44:30 -06:00
sni_53c710.c [SCSI] sni_53c710: Cleanup 2007-07-14 19:12:15 -05:00
sr_ioctl.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
sr_vendor.c [PATCH] getting rid of all casts of k[cmz]alloc() calls 2006-12-13 09:05:58 -08:00
sr.c [SCSI] sr: fix error handling in module_init 2007-07-14 18:54:34 -05:00
sr.h
st_options.h
st.c bsg: add a request_queue argument to scsi_cmd_ioctl() 2007-07-16 08:52:45 +02:00
st.h [SCSI] st: fix Tape dies if wrong block size used, bug 7919 2007-02-03 08:05:47 -06:00
stex.c [SCSI] stex: use resid for xfer len information 2007-07-14 18:59:10 -05:00
sun3_NCR5380.c [PATCH] m68k trivial build fixes 2006-12-17 10:21:53 -08:00
sun3_scsi_vme.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
sun3_scsi.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
sun3_scsi.h
sun3x_esp.c [TC] dec_esp: Driver model for the PMAZ-A 2007-02-09 16:23:17 +00:00
sun_esp.c [SCSI] esp: use shost_priv 2007-05-31 17:30:04 -04:00
sym53c416.c [SCSI] sym53c416: convert to use the data buffer accessors 2007-05-26 19:08:50 -05:00
sym53c416.h
t128.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
t128.h
tmscsim.c [SCSI] tmscsim: Further clean-up of the driver 2007-07-14 18:56:33 -05:00
tmscsim.h [SCSI] tmscsim: Further clean-up of the driver 2007-07-14 18:56:33 -05:00
u14-34f.c [SCSI] u14-34f: convert to use the data buffer accessors 2007-05-26 19:19:04 -05:00
ultrastor.c [SCSI] ultrastor: convert to use the data buffer accessors 2007-05-26 19:18:38 -05:00
ultrastor.h
wd33c93.c [SCSI] wd33c93: Fast SCSI with WD33C93B 2007-02-16 09:22:11 -06:00
wd33c93.h [SCSI] wd33c93: Fast SCSI with WD33C93B 2007-02-16 09:22:11 -06:00
wd7000.c [SCSI] wd7000: convert to use the data buffer accessors 2007-05-26 19:18:10 -05:00
zalon.c
zorro7xx.c [SCSI] 53c700: Fixup m68k drivers: 2007-06-19 19:53:35 -07:00