linux-kernel - [PATCH] x86: fix APIC warning on 32bit

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Message-Id: <200805221735.22482.yhlu.kernel@gmail.com>
Date:	Thu, 22 May 2008 17:35:22 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Gabriel C <nix.or.die@...glemail.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: fix APIC warning on 32bit


for
[Bug #10613] BIOS bug, APIC version is 0 for CPU#0!
http://bugzilla.kernel.org/show_bug.cgi?id=10613

BIOS bug, APIC version is 0 for CPU#0! fixing up to 0x10. (tell your hw vendor)

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

Index: linux-2.6/arch/x86/kernel/acpi/boot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/acpi/boot.c
+++ linux-2.6/arch/x86/kernel/acpi/boot.c
@@ -242,12 +242,17 @@ static int __init acpi_parse_madt(struct
 
 static void __cpuinit acpi_register_lapic(int id, u8 enabled)
 {
+	unsigned int ver = 0;
+
 	if (!enabled) {
 		++disabled_cpus;
 		return;
 	}
 
-	generic_processor_info(id, 0);
+	if (boot_cpu_physical_apicid != -1U)
+		ver = apic_version[boot_cpu_physical_apicid];
+
+	generic_processor_info(id, ver);
 }
 
 static int __init
@@ -763,8 +768,11 @@ static void __init acpi_register_lapic_a
 	mp_lapic_addr = address;
 
 	set_fixmap_nocache(FIX_APIC_BASE, address);
-	if (boot_cpu_physical_apicid == -1U)
+	if (boot_cpu_physical_apicid == -1U) {
+		unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
 		boot_cpu_physical_apicid  = GET_APIC_ID(read_apic_id());
+		apic_version[boot_cpu_physical_apicid] = ver;
+	}
 }
 
 static int __init early_acpi_parse_madt_lapic_addr_ovr(void)
--
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