From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Chubb <peter@chubb.wattle.id.au>
Date: Wed, 26 Mar 2003 01:55:55 +0000
Subject: Re: [Linux-ia64] ia64_mca_rendez_int_handler use of hard_smp_processor_id
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To: linux-ia64@vger.kernel.org


Index: 20.5/arch/ia64/kernel/mca.c
--- 20.5/arch/ia64/kernel/mca.c Wed, 11 Dec 2002 20:58:53 +1100 kaos (linux-2.4/s/c/5_mca.c 1.1.3.2.3.1.1.1.1.3 644)
+++ 20.5(w)/arch/ia64/kernel/mca.c Wed, 26 Mar 2003 08:14:29 +1100 kaos (linux-2.4/s/c/5_mca.c 1.1.3.2.3.1.1.1.1.3 644)
@@ -640,13 +640,10 @@ ia64_mca_wakeup_all(void)
 void
 ia64_mca_rendez_int_handler(int rendez_irq, void *arg, struct pt_regs *ptregs)
 {
-	int flags, cpu = 0;
+	int flags, cpu = smp_processor_id();
 	/* Mask all interrupts */
 	save_and_cli(flags);

If this is called from a preemptible context, then move the cpu cmp_processor_id() within the save_and_cli() section, or it won't be
preempt safe.  (thread could be migrated between getting the processor
ID and stopping interrupts.)

Peter C