PLEASE TEST: IPI deadlock avoidance patch

[Willem Jan Withagen]

Doug White wrote:

>134 = 128 + signal number.  Anyway, can you check your rev of
>src/sys/kern/kern_lock.c?  If its 1.74, please back up to a working
>kernel, cvsup, and rebuild.  That rev is bogus.
>  
>
But that has to take me beyond the RELENG_5 marker, right??
Because after this mornings cvsup I still have:
__FBSDID("$FreeBSD: src/sys/kern/kern_lock.c,v 1.74.2.1 2004/08/26 
00:00:18 kan

I'll get myself a -CURRENT tree as well just to track these kinds of things.

--WjW