linux-kernel - [PATCH 3/8] x86: I/O APIC: Remove redundant 8259A {,un}masking

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Date:	Tue, 27 May 2008 21:19:22 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 3/8] x86: I/O APIC: Remove redundant 8259A {,un}masking

 For a better control the masking and unmasking of the timer interrupt
line in the 8259A operating in the 'Virtual Wire' mode has been moved out
of setup_ExtINT_IRQ0_pin() now, so remove the redundant calls from the 
function.

Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
---
patch-2.6.26-rc1-20080505-timer-extint-nomask-2
diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/io_apic_32.c linux-2.6.26-rc1-20080505/arch/x86/kernel/io_apic_32.c
--- linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/io_apic_32.c	2008-05-25 21:45:06.000000000 +0000
+++ linux-2.6.26-rc1-20080505/arch/x86/kernel/io_apic_32.c	2008-05-25 21:46:53.000000000 +0000
@@ -1310,8 +1310,6 @@ static void __init setup_ExtINT_IRQ0_pin
 
 	memset(&entry,0,sizeof(entry));
 
-	disable_8259A_irq(0);
-
 	/* mask LVT0 */
 	apic_write_around(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
 
@@ -1337,8 +1335,6 @@ static void __init setup_ExtINT_IRQ0_pin
 	 * Add it to the IO-APIC irq-routing table:
 	 */
 	ioapic_write_entry(apic, pin, entry);
-
-	enable_8259A_irq(0);
 }
 
 void __init print_IO_APIC(void)
diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/io_apic_64.c linux-2.6.26-rc1-20080505/arch/x86/kernel/io_apic_64.c
--- linux-2.6.26-rc1-20080505.macro/arch/x86/kernel/io_apic_64.c	2008-05-18 00:24:43.000000000 +0000
+++ linux-2.6.26-rc1-20080505/arch/x86/kernel/io_apic_64.c	2008-05-25 21:46:53.000000000 +0000
@@ -906,8 +906,6 @@ static void __init setup_ExtINT_IRQ0_pin
 
 	memset(&entry, 0, sizeof(entry));
 
-	disable_8259A_irq(0);
-
 	/* mask LVT0 */
 	apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
 
@@ -933,8 +931,6 @@ static void __init setup_ExtINT_IRQ0_pin
 	 * Add it to the IO-APIC irq-routing table:
 	 */
 	ioapic_write_entry(apic, pin, entry);
-
-	enable_8259A_irq(0);
 }
 
 void __apicdebuginit print_IO_APIC(void)
--
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