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Subject[patch] Real-Time Preemption, -VP-2.6.9-rc4-mm1-U4

i have released the -U4 PREEMPT_REALTIME patch:

this is a fixes-only release, and it is still experimental code.

Changes since -U3:

- crash fix: fix the rtc_lock related crash reported by Bill Huey, the
rtc_lock is now a raw spinlock again.

- crash fix: avoid recursion into timer code when PREEMPT_TIMING is

- crash/printout fix: revert some of selinux's locks back to raw
spinlocks. This could fix the problems reported by Mark H. Johnson,
Adam Heath.

- build fix: fix the compilation problems reported by Lee Revell

- debug feature: implemented 'print backtrace on all CPUs' on SMP
systems, SysRq+L will trigger it.

- build cleanup: restructure the debug config options. This should
resolve the build problems and incompatible debug-options
problems reported.

- cleanup: move definitions around, turn on generic rwlocks instead of
the x86-specific version.

i think all bugs that were reported with logs are fixed in -U4. Please
re-report any issue that might remain.

to create a -U4 tree from scratch the patching order is:

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