linux/drivers/usb/core
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
..
buffer.c USB: a bit more coding style cleanup 2007-02-07 15:44:40 -08:00
config.c USB: add IAD support to usbfs and sysfs 2007-07-12 16:34:40 -07:00
devices.c USB: add IAD support to usbfs and sysfs 2007-07-12 16:34:40 -07:00
devio.c usbfs micro optimitation 2007-04-27 13:28:42 -07:00
driver.c USB: Make usb-autosuspend timer 1 sec jiffy aligned 2007-07-12 16:34:40 -07:00
endpoint.c USB: In init_endpoint_class, use PTR_ERR to obtain an errno value, not IS_ERR 2007-02-16 15:32:17 -08:00
file.c USB: prevent char device open/deregister race 2007-07-12 16:29:48 -07:00
generic.c USB: unify reset_resume and normal resume 2007-07-12 16:34:30 -07:00
hcd-pci.c USB: remove references to dev.power.power_state 2007-07-12 16:29:46 -07:00
hcd.c USB: Don't resume root hub if the controller is suspended 2007-07-12 16:34:39 -07:00
hcd.h USB: separate root and non-root suspend/resume 2007-07-12 16:34:29 -07:00
hub.c Freezer: make kernel threads nonfreezable by default 2007-07-17 10:23:02 -07:00
hub.h USB: Move private hub declarations out of public header file 2006-12-01 14:23:30 -08:00
inode.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
Kconfig USB: add power/persist device attribute 2007-07-12 16:34:30 -07:00
Makefile USB: add a blacklist for devices that can't handle some things we throw at them. 2007-02-23 15:03:46 -08:00
message.c USB: add IAD support to usbfs and sysfs 2007-07-12 16:34:40 -07:00
notify.c usbfs: private mutex for open, release, and remove 2006-09-27 11:58:49 -07:00
otg_whitelist.h USB: Fix apparent typo CONFIG_USB_CDCETHER. 2007-02-16 15:32:18 -08:00
quirks.c USB: additions to the quirk list 2007-07-12 16:34:43 -07:00
sysfs.c USB: add IAD support to usbfs and sysfs 2007-07-12 16:34:40 -07:00
urb.c USB: Add URB_FREE_BUFFER flag and the logic behind it 2007-07-12 16:34:38 -07:00
usb.c USB: usb/dma doc updates 2007-07-12 16:34:42 -07:00
usb.h USB: unify reset_resume and normal resume 2007-07-12 16:34:30 -07:00