linux-kernel - [PATCH] x86_64: remove sync_Arb

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Message-id: <200708071319.23586.yinghai.lu@sun.com>
Date:	Tue, 07 Aug 2007 13:19:23 -0700
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen <ak@...e.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86_64: remove sync_Arb_IDs

[PATCH] x86_64: remove sync_Arb_IDs

i386 code said
       /*
        * Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 And not
        * needed on AMD.
        */
So we don't need sync_Arb_IDs for x86_64...

Signed-off-by: Yinghai Lu <yinghai.lu@....com>

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 900ff38..800dec3 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -283,23 +283,6 @@ int __init verify_local_APIC(void)
 	return 1;
 }
 
-void __init sync_Arb_IDs(void)
-{
-	/* Unsupported on P4 - see Intel Dev. Manual Vol. 3, Ch. 8.6.1 */
-	unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
-	if (ver >= 0x14)	/* P4 or higher */
-		return;
-
-	/*
-	 * Wait for idle.
-	 */
-	apic_wait_icr_idle();
-
-	apic_printk(APIC_DEBUG, "Synchronizing Arb IDs.\n");
-	apic_write(APIC_ICR, APIC_DEST_ALLINC | APIC_INT_LEVELTRIG
-				| APIC_DM_INIT);
-}
-
 /*
  * An initial setup of the virtual wire mode.
  */
diff --git a/arch/x86_64/kernel/io_apic.c b/arch/x86_64/kernel/io_apic.c
index 050141c..171359c 100644
--- a/arch/x86_64/kernel/io_apic.c
+++ b/arch/x86_64/kernel/io_apic.c
@@ -1783,7 +1786,6 @@ void __init setup_IO_APIC(void)
 
 	apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
 
-	sync_Arb_IDs();
 	setup_IO_APIC_irqs();
 	init_IO_APIC_traps();
 	check_timer();
-
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