HEADSUP: MPSAFE network drivers

[Sam Leffler]

I'm committing changes to mark various network drivers' interrupt handlers 
MPSAFE. To insure folks have a way to backout if they hit problems I've also 
added a tunable that lets you disable this w/o rebuilding your kernel.  By 
default all network drivers that register an interrupt handler INTR_MPSAFE 
are setup to run their ISR w/o Giant.  If you want to defeat this w/o 
changing the code you can set

debug.mpsafenet=0

from the loader when booting and the MPSAFE bit will automatically be removed.  
I plan to use this to also control forthcoming changes for registering MPSAFE 
netisrs.

The following drivers are marked MPSAFE:

ath, em, ep, fxp, sn, wi, sis

I've got changes coming for bge.  Other drivers probably can be marked MPSAFE 
but I'm only doing it for those drivers that I can test.

	Sam
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From: Sam Leffler <sam at FreeBSD.org>
Subject: cvs commit: src/sys/kern subr_bus.c
Date: Wed, 29 Oct 2003 10:29:50 -0800 (PST)
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