linux-kernel - [PATCH] x86,acpi: early_init_lapic_mapping

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Message-ID: <20090826171324.GC4548@lenovo>
Date:	Wed, 26 Aug 2009 21:13:24 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Ingo Molnar <mingo@...e.hu>, Yinghai Lu <yinghai@...nel.org>
Cc:	x86team <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86,acpi: early_init_lapic_mapping - slim down stack usage

As far as I see there is no external poking of
mp_lapic_addr in this procedure which could lead
to unpredited changes and require local storage
unit for it. Lets use it plain forward.

Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
---
 arch/x86/kernel/apic/apic.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/apic/apic.c
=====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/apic/apic.c
+++ linux-2.6.git/arch/x86/kernel/apic/apic.c
@@ -1562,8 +1562,6 @@ no_apic:
 #ifdef CONFIG_X86_64
 void __init early_init_lapic_mapping(void)
 {
-	unsigned long phys_addr;
-
 	/*
 	 * If no local APIC can be found then go out
 	 * : it means there is no mpatable and MADT
@@ -1571,11 +1569,9 @@ void __init early_init_lapic_mapping(voi
 	if (!smp_found_config)
 		return;
 
-	phys_addr = mp_lapic_addr;
-
-	set_fixmap_nocache(FIX_APIC_BASE, phys_addr);
+	set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
 	apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
-		    APIC_BASE, phys_addr);
+		    APIC_BASE, mp_lapic_addr);
 
 	/*
 	 * Fetch the APIC ID of the BSP in case we have a
--
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