From owner-freebsd-alpha  Mon Apr 23  9:33:48 2001
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To: Andrew Gallatin <gallatin@cs.duke.edu>
Cc: John Baldwin <jhb@FreeBSD.ORG>, alpha@FreeBSD.ORG
Subject: Re: SMP is stable now. Whee! :) 
In-Reply-To: <15076.11793.428586.604450@grasshopper.cs.duke.edu> 
Date: Mon, 23 Apr 2001 09:33:43 -0700
From: Peter Wemm <peter@wemm.org>
Message-Id: <20010423163343.8E38638FC@overcee.netplex.com.au>
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Andrew Gallatin wrote:
> 
> Peter Wemm writes:
>  > I just fired it up on a UP2000+ w/ dual 833MHz cpus (4MB DDR L2 cache each
    )
>  > and it was rather uneventful.
>  > 
>  > That is.. it was until I typed 'make -j4 world':
>  > lock order reversal
>  >  1st clk last acquired @ ../../alpha/alpha/clock.c:569
>  >  2nd 0xfffffc00006ce728 smp rendezvous @ ../../alpha/alpha/mp_machdep.c:60
    5
>  >  3rd 0xfffffc00006d9870 clk @ ../../alpha/alpha/clock.c:390
>  > [hang]
>  > 
>  > This is with alpha.smp.patch, plus the stuff recent commits.  I had to cha
    nge
>  > some #idef's into #ifdefs in alpha/trap.c though.
> 
> Huh? idef?  Where?
> 
> Can you build with WITNESS_DDB and KTR, with the KTR_MASK set to
> something like -1 and dump the ktr buffer when this happens?
> 
> Drew

In John's alpha.smp.patch:

@@ -704,11 +714,22 @@
 	u_quad_t sticks;
 	u_int64_t args[10];					/* XXX */
 	u_int hidden = 0, nargs;
+#idef SMP
+	critical_t s;
+#endif
 
 	/*
 	 * Find our per-cpu globals.
 	 */
+#idef SMP
+	s = critical_enter();
+#endif
 	globalp = (struct globaldata *) alpha_pal_rdval();
+	p = curproc;
+#idef SMP
+	p->p_md.md_kernnest++;
+	critical_exit(s);
+#endif
 	mtx_lock(&Giant);
 
 	framep->tf_regs[FRAME_TRAPARG_A0] = 0;

I'm not sure how John compiled that...

Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
"All of this is for nothing if we don't go to the stars" - JMS/B5


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