On Monday 05 April 2010, Pavel Machek wrote: > Hi! > > > > > Please note that merely _opening_ /dev/snapshot has side effects, so that's > > > > not just "three ioctls". > > > > > > I search Doc*/power/userland-swsusp.txt, and could not find mentions > > > of sideeffects. Perhaps that should be fixed? > > > > Please feel free to make the docs more complete, then. > > Yes, something like this? Yes, looks reasonable. I've applied it to suspend-2.6/linux-next (added a changelog). Rafael > Signed-off-by: Pavel Machek <pavel@xxxxxx> > > --- a/Documentation/power/userland-swsusp.txt > +++ b/Documentation/power/userland-swsusp.txt > @@ -24,6 +24,10 @@ assumed to be in the resume mode. The device cannot be open for simultaneous > reading and writing. It is also impossible to have the device open more than > once at a time. > > +Even opening the device has side effects. Data structures are > +allocated, and PM_HIBERNATION_PREPARE / PM_RESTORE_PREPARE chains are > +called. > + > The ioctl() commands recognized by the device are: > > SNAPSHOT_FREEZE - freeze user space processes (the current process is > > > > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
