linux-kernel - [patch 3/4] x86_64: add genapic

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Message-ID: <20061107174315.C5401@unix-os.sc.intel.com>
Date:	Tue, 7 Nov 2006 17:43:15 -0800
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	ak@...e.de, akpm@...l.org
Cc:	shaohua.li@...el.com, linux-kernel@...r.kernel.org,
	discuss@...-64.org, ashok.raj@...el.com, suresh.b.siddha@...el.com
Subject: [patch 3/4] x86_64: add genapic_force

Add genapic_force. Used by the next Intel quirks patch.

Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
---

diff --git a/arch/x86_64/kernel/genapic.c b/arch/x86_64/kernel/genapic.c
index 8e78a75..236dc9e 100644
--- a/arch/x86_64/kernel/genapic.c
+++ b/arch/x86_64/kernel/genapic.c
@@ -33,7 +33,7 @@ extern struct genapic apic_flat;
 extern struct genapic apic_physflat;
 
 struct genapic *genapic = &apic_flat;
-
+struct genapic *genapic_force;
 
 /*
  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
@@ -46,6 +46,14 @@ void __init clustered_apic_check(void)
 	u8 cluster_cnt[NUM_APIC_CLUSTERS];
 	int max_apic = 0;
 
+	/* genapic selection can be forced because of certain quirks and
+	 * in future perhaps user can select this through cmdline
+	 */
+	if (genapic_force) {
+		genapic = genapic_force;
+		goto print;
+	}
+
 #if defined(CONFIG_ACPI)
 	/*
 	 * Some x86_64 machines use physical APIC mode regardless of how many
diff --git a/include/asm-x86_64/genapic.h b/include/asm-x86_64/genapic.h
index a0e9a4b..b80f4bb 100644
--- a/include/asm-x86_64/genapic.h
+++ b/include/asm-x86_64/genapic.h
@@ -30,6 +30,6 @@ struct genapic {
 };
 
 
-extern struct genapic *genapic;
+extern struct genapic *genapic, *genapic_force, apic_flat;
 
 #endif
-
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