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@linux-mips.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index 6b220b9..50e1131 100644 (file)
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -2052,7 +2052,7 @@ static struct irq_chip lapic_chip __read_mostly = {
        .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(void)
 
        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);