linux-kernel - Re: [PATCH 8/8] x86_64: V2 Support for new UV apic

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Date:	Sun, 30 Mar 2008 21:02:07 -0500
From:	Jack Steiner <steiner@....com>
To:	mingo@...e.hu, tglx@...utronix.de, yhlu.kernel@...il.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] x86_64: V2 Support for new UV apic

Fix double-shift of apicid in previous patch.

Signed-off-by: Jack Steiner <steiner@....com>


---
The code is clearly wrong.  I booted on an 8p AMD box and
had no problems. Apparently the kernel (at least basic booting) is
not too sensitive to incorrect apicids being returned. Most
critical-to-boot code must use apicids from the ACPI tables.


 arch/x86/kernel/genapic_64.c |    2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

Index: linux/arch/x86/kernel/genapic_64.c
===================================================================
--- linux.orig/arch/x86/kernel/genapic_64.c	2008-03-30 20:37:18.000000000 -0500
+++ linux/arch/x86/kernel/genapic_64.c	2008-03-30 20:48:30.000000000 -0500
@@ -98,8 +98,6 @@ unsigned int read_apic_id(void)
 	id = apic_read(APIC_ID);
 	if (uv_system_type >= UV_X2APIC)
 		id  |= __get_cpu_var(x2apic_extra_bits);
-	else
-		id = (id >> 24) & 0xFFu;;
 	return id;
 }
 
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