[patch] big IRQ lock removal, 2.5.27-F3

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the latest irqremove patch, against 2.5.27-BK-current:

   http://redhat.com/~mingo/remove-irqlock-patches/remove-irqlock-2.5.27-F3

Changes:

 - the entry.S cleanups/speedups by Oleg Nesterov.

 - a rather critical synchronize_irq() bugfix: if a driver frees an
   interrupt that is still being probed then synchronize_irq() locks up.
   This bug has caused a spurious boot-lockup on one of my testsystems,
   ifconfig would lock up trying to close eth0.

 - remove duplicate definitions from asm-i386/system.h, this fixes
   compiler warnings.

compiles, boots, works just fine.

        Ingo

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