linux-kernel - [PATCH 1/3] x86: L-APIC: Set IRQ0 as edge-triggered

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Date:	Fri, 11 Jul 2008 19:34:36 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Stephen Rothwell <sfr@...b.auug.org.au>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] x86: L-APIC: Set IRQ0 as edge-triggered

 IRQ0 is edge-triggered, but the "8259A Virtual Wire" through the local
APIC configuration in the 32-bit version uses the "fasteoi" handler
suitable for level-triggered APIC interrupt.  Rewrite code so that the 
"edge" handler is used.  The 64-bit version uses different code and is 
unaffected.

Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
Cc: Rafael J. Wysocki <rjw@...k.pl>
Cc: Matthew Garrett <mjg59@...f.ucam.org>
Cc: Andreas Herrmann <andreas.herrmann3@....com>
---

 Note this is against linux-next.

patch-next-2.6.26-rc9-20080711-timer-lapic-edge-7
diff -up --recursive --new-file linux-next-2.6.26-rc9-20080711.macro/arch/x86/kernel/io_apic_32.c linux-next-2.6.26-rc9-20080711/arch/x86/kernel/io_apic_32.c
--- linux-next-2.6.26-rc9-20080711.macro/arch/x86/kernel/io_apic_32.c	2008-07-11 17:10:33.000000000 +0000
+++ linux-next-2.6.26-rc9-20080711/arch/x86/kernel/io_apic_32.c	2008-07-11 17:51:05.000000000 +0000
@@ -2052,7 +2052,7 @@ static struct irq_chip lapic_chip __read
 	.name		= "local-APIC",
 	.mask		= mask_lapic_irq,
 	.unmask		= unmask_lapic_irq,
-	.eoi		= ack_apic,
+	.ack		= ack_apic,
 };
 
 static void __init setup_nmi(void)
@@ -2257,8 +2257,8 @@ static inline void __init check_timer(vo
 
 	printk(KERN_INFO "...trying to set up timer as Virtual Wire IRQ...");
 
-	set_irq_chip_and_handler_name(0, &lapic_chip, handle_fasteoi_irq,
-				      "fasteoi");
+	set_irq_chip_and_handler_name(0, &lapic_chip, handle_edge_irq,
+				      "edge");
 	apic_write_around(APIC_LVT0, APIC_DM_FIXED | vector);	/* Fixed mode */
 	enable_8259A_irq(0);
 
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