linux-kernel - [PATCH] x86/mrst: assign a guessed cpu

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Message-Id: <1277914261-6918-1-git-send-email-jacob.jun.pan@linux.intel.com>
Date:	Wed, 30 Jun 2010 09:11:01 -0700
From:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alan Cox <alan@...ux.intel.com>
Cc:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH] x86/mrst: assign a guessed cpu_khz value before calibration

The new setup_local_APIC() code introduced by commit 8c3ba8d0 requires a valid
cpu_khz value used as max loop count for clearing pending interrupts. However,
Moorestown does a early APIC setup for the system timer interrupts which is
before a valid cpu_khz is assigned in tsc calibration code.

This patch assigns a guessed value for cpu_khz to avoid a warning in local APIC
setup code. The acuracy of cpu_khz is not important at the point of local APIC
setup.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 arch/x86/kernel/mrst.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/mrst.c b/arch/x86/kernel/mrst.c
index 5fd5f9c..4901554 100644
--- a/arch/x86/kernel/mrst.c
+++ b/arch/x86/kernel/mrst.c
@@ -387,7 +387,12 @@ void __init x86_mrst_early_setup(void)
 	/* Avoid searching for BIOS MP tables */
 	x86_init.mpparse.find_smp_config = x86_init_noop;
 	x86_init.mpparse.get_smp_config = x86_init_uint_noop;
-
+	/*
+	 * Give an estimated CPU frequency which will be used by early local
+	 * APIC setup code prior to calibration. The true value will be set
+	 * in tsc calibration later.
+	 */
+	cpu_khz = 1500000;
 }
 
 /*
-- 
1.7.0.4

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