linux-kernel - [tip:x86/apic] x86, apic: Slim down stack usage in early_init_lapic

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Message-ID: <tip-d3a247bfb2c26f5b67367d58af7ad8c2efbbc6c1@git.kernel.org>
Date:	Wed, 26 Aug 2009 19:13:19 GMT
From:	tip-bot for Cyrill Gorcunov <gorcunov@...nvz.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	yinghai@...nel.org, gorcunov@...nvz.org, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:x86/apic] x86, apic: Slim down stack usage in early_init_lapic_mapping()

Commit-ID:  d3a247bfb2c26f5b67367d58af7ad8c2efbbc6c1
Gitweb:     http://git.kernel.org/tip/d3a247bfb2c26f5b67367d58af7ad8c2efbbc6c1
Author:     Cyrill Gorcunov <gorcunov@...nvz.org>
AuthorDate: Wed, 26 Aug 2009 21:13:24 +0400
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 26 Aug 2009 20:26:23 +0200

x86, apic: Slim down stack usage in early_init_lapic_mapping()

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>
Cc: Yinghai Lu <yinghai@...nel.org>
LKML-Reference: <20090826171324.GC4548@...ovo>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/kernel/apic/apic.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 3fc3a6c..159740d 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/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(void)
 	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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