linux-kernel - [PATCH] x86: checkt rev 3 fadt correctly for physical

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Date:	Tue, 28 Oct 2008 00:34:59 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: checkt rev 3 fadt correctly for physical_apic bit


Impact: fix fadt version checking

FADT2_REVISION_ID is 3 aka rev 3 FADT. so need to use >= instead of >

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/kernel/genapic_flat_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/genapic_flat_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/genapic_flat_64.c
+++ linux-2.6/arch/x86/kernel/genapic_flat_64.c
@@ -197,7 +197,7 @@ static int physflat_acpi_madt_oem_check(
 	 * regardless of how many processors are present (x86_64 ES7000
 	 * is an example).
 	 */
-	if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
+	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
 		(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
 		printk(KERN_DEBUG "system APIC only can use physical flat");
 		return 1;
--
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