linux-kernel - [PATCH] x86: smpboot - check if we have ESR register in wakeup_secondary

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Date:	Sun, 14 Sep 2008 21:58:49 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH] x86: smpboot - check if we have ESR register in
	wakeup_secondary_cpu

We should check if we have ESR register before writting to it.

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---

Please review!
it seems the same nit in do_boot_cpu - checking now.

Index: linux-2.6.git/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/smpboot.c	2008-09-14 19:43:03.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/smpboot.c	2008-09-14 21:49:36.000000000 +0400
@@ -598,10 +598,12 @@ wakeup_secondary_cpu(int logical_apicid,
 	 * Give the other CPU some time to accept the IPI.
 	 */
 	udelay(200);
-	maxlvt = lapic_get_maxlvt();
-	if (maxlvt > 3)			/* Due to the Pentium erratum 3AP.  */
-		apic_write(APIC_ESR, 0);
-	accept_status = (apic_read(APIC_ESR) & 0xEF);
+	if (APIC_INTEGRATED(apic_version[phys_apicid])) {
+		maxlvt = lapic_get_maxlvt();
+		if (maxlvt > 3)			/* Due to the Pentium erratum 3AP.  */
+			apic_write(APIC_ESR, 0);
+		accept_status = (apic_read(APIC_ESR) & 0xEF);
+	}
 	pr_debug("NMI sent.\n");
 
 	if (send_status)
--
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