updated preemptive kernel for 2.4-ac

An updated preempt-kernel patch against 2.4.19-pre10-ac2 is available at

	http://www.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/v2.4/preempt-kernel-rml-2.4.19-pre10-ac2-2.patch

and your favorite mirror.

The cause of this release is to make the pte_chain_lock and unlock routines preempt-safe. They basically are per-bit spinlocks and thus require the standard spinlock treatment but do not receive it.

This patch also merges PPC support, to bring the supported architectures to ARM, i386, MIPS, PPC, and SH. This code is contributed by MontaVista.

Finally, there is a critical fix and optimization in entry.S by George Anzinger.

Full ChangeLog:

20020620

- i386 entry.S changes, no need to check the (George Anzinger)
the irq or bh_count but we do need to make
sure interrupts are off
- preempt-safe pte_chain_lock and unlock (Robert Love)
- merge PPC support (Robert Love)
- fix typo in smp.c (Robert Love)

20020608

- merge MIPS support (Robert Love)

20020529

- preempt-safe in_interrupt and in_irq (George Anzinger)
- preempt-safe arch/i386/kernel/smp.c (George Anzinger)
- preempt-safe net/* (George Anzinger)
- change the wording of the do_exit notice (Robert Love)

Enjoy,

Robert Love