linux-kernel - Re: [PATCH 1/3] x86: add lapic_shutdown for x86

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Message-ID: <47195807.6030809@ct.jp.nec.com>
Date:	Fri, 19 Oct 2007 18:21:11 -0700
From:	Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
To:	vgoyal@...ibm.com, hbabu@...ibm.com, tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH 1/3] x86: add lapic_shutdown for x86_64

From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
---
 arch/x86/kernel/apic_64.c |   14 ++++++++++++++
 include/asm-x86/apic_64.h |    1 +
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index f47bc49..f28ccb5 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -287,6 +287,20 @@ void disable_local_APIC(void)
 	apic_write(APIC_SPIV, value);
 }
 
+void lapic_shutdown(void)
+{
+	unsigned long flags;
+
+	if (!cpu_has_apic)
+		return;
+
+	local_irq_save(flags);
+
+	disable_local_APIC();
+
+	local_irq_restore(flags);
+}
+
 /*
  * This is to verify that we're looking at a real local APIC.
  * Check these against your board if the CPUs aren't getting
diff --git a/include/asm-x86/apic_64.h b/include/asm-x86/apic_64.h
index 3c8f21e..2747a11 100644
--- a/include/asm-x86/apic_64.h
+++ b/include/asm-x86/apic_64.h
@@ -69,6 +69,7 @@ extern void clear_local_APIC (void);
 extern void connect_bsp_APIC (void);
 extern void disconnect_bsp_APIC (int virt_wire_setup);
 extern void disable_local_APIC (void);
+extern void lapic_shutdown (void);
 extern int verify_local_APIC (void);
 extern void cache_APIC_registers (void);
 extern void sync_Arb_IDs (void);
-- 
1.5.2.3
-
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