[PATCH v6 0/5] um: suspend/resume support

[Johannes Berg]

This adds suspend/resume support to ARCH=um, both in regular and
time-travel modes.

The biggest complexity was around how IRQs are handled, and I've
solved that in patch 4 - basically just disables SIGIO for any FD
that shouldn't wake up the system, and then some trickery with the
signal handler to not deliver interrupts while they're still not
enabled again.


v6:
 - a few build fixes for !CONFIG_UML_TIME_TRAVEL, thanks Anton

johannes