[patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.43-00

Ingo Molnar
2005-04-01T10:48:07Z

i have released the -V0.7.43-00 Real-Time Preemption patch, which can be
downloaded from the usual place:

http://redhat.com/~mingo/realtime-preempt/

this release too is a step towards more robustness. I found a bug that
caused an infinite recursion and subsequent spontaneous reboot. The bug
was once again related to lock->debug locks, so i decided to get rid of
them altogether: from now on every lock in the -RT domain is debugged.

To be able to use code that relies on incompatible properties of stock
Linux semaphores (and rwsems), i've added a new compile-time
semaphore-type mechanism that enables the easy switching from RT
semaphores to stock semaphores. I've done this conversion for all
subsystems that needed it - e.g. XFS, firewire, USB and SCSI. XFS seems
to be working much better with this approach - BYMMV.

but an unavoidable side-effect is that the whole codebase got turned
upside down once again, so be careful and expect a few rough edges. In
particular keep an eye on new compile-time warnings related to
semaphores - code that gives a warning might build but it will almost
certainly not work.

to create a -V0.7.43-00 tree from scratch, the patching order is:

http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.11.tar.bz2
http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.12-rc1.bz2
http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.12-rc1-V0.7.43-00

Ingo