rfc: cpu_shutdown() patch

[David Young <dyoung%pobox.com@localhost>]

With this patch, we never shut down the bootstrap processor (BSP).
Perhaps this will help 'shutdown -p now' to work more consistently on MP
machines?

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 344-0444 x24

Index: sys/arch/x86/x86/cpu.c
===================================================================
RCS file: /cvsroot/src/sys/arch/x86/x86/cpu.c,v
retrieving revision 1.89
diff -u -p -r1.89 cpu.c
--- sys/arch/x86/x86/cpu.c      22 Jun 2011 09:28:08 -0000      1.89
+++ sys/arch/x86/x86/cpu.c      25 Jul 2011 20:29:46 -0000
@@ -1137,6 +1137,12 @@ cpu_resume(device_t dv, const pmf_qual_t
 static bool
 cpu_shutdown(device_t dv, int how)
 {
+       struct cpu_softc *sc = device_private(dv);
+       struct cpu_info *ci = sc->sc_info;
+
+       if (ci->ci_flags & CPUF_BSP)
+               return false;
+
        return cpu_suspend(dv, NULL);
 }