linux-kernel - [PATCH] x86: don't map io

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Date:	Tue, 19 May 2009 22:23:25 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: don't map io_apic two times.


mp_register_ioapic() already map it.

[ Impact: don't map io apic address again ]

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 arch/x86/kernel/apic/io_apic.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -4162,7 +4162,12 @@ fake_ioapic_page:
 				alloc_bootmem_pages(PAGE_SIZE);
 			ioapic_phys = __pa(ioapic_phys);
 		}
-		set_fixmap_nocache(idx, ioapic_phys);
+		/*
+		 * when acpi ioapic is used, mp_register_ioapic() map
+		 * ioapic_phys already
+		 */
+		if (!acpi_ioapic)
+			set_fixmap_nocache(idx, ioapic_phys);
 		apic_printk(APIC_VERBOSE,
 			    "mapped IOAPIC to %08lx (%08lx)\n",
 			    __fix_to_virt(idx), ioapic_phys);
--
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