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authorThomas Gleixner <tglx@linutronix.de>2009-08-20 15:59:35 +0200
committerThomas Gleixner <tglx@linutronix.de>2009-08-31 09:35:46 +0200
commit0be6939422eb2f54df4b3d8763c569c6759c1a42 (patch)
tree0bfde8bc4c230f8a5f0f5f2651c8ebc366020124 /arch
parent64fcbac1f38882d8ae82c44a1c2a676cfa5e79e1 (diff)
downloadblackbird-op-linux-0be6939422eb2f54df4b3d8763c569c6759c1a42.tar.gz
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x86: Remove mca bus ifdef from timer interrupt
MCA_bus is constant 0 when CONFIG_MCA=n. So the compiler removes that code w/o needing an extra #ifdef Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/time_32.c18
-rw-r--r--arch/x86/kernel/time_64.c9
2 files changed, 6 insertions, 21 deletions
diff --git a/arch/x86/kernel/time_32.c b/arch/x86/kernel/time_32.c
index 7a26bcf887f6..ec729cdcfa3d 100644
--- a/arch/x86/kernel/time_32.c
+++ b/arch/x86/kernel/time_32.c
@@ -78,21 +78,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
global_clock_event->event_handler(global_clock_event);
-#ifdef CONFIG_MCA
- if (MCA_bus) {
- /* The PS/2 uses level-triggered interrupts. You can't
- turn them off, nor would you want to (any attempt to
- enable edge-triggered interrupts usually gets intercepted by a
- special hardware circuit). Hence we have to acknowledge
- the timer interrupt. Through some incredibly stupid
- design idea, the reset for IRQ 0 is done by setting the
- high bit of the PPI port B (0x61). Note that some PS/2s,
- notably the 55SX, work fine if this is removed. */
-
- u8 irq_v = inb_p(0x61); /* read the current state */
- outb_p(irq_v | 0x80, 0x61); /* reset the IRQ */
- }
-#endif
+ /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
+ if (MCA_bus)
+ outb_p(inb_p(0x61)| 0x80, 0x61);
return IRQ_HANDLED;
}
diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index 35e0a925da56..7db3912b8692 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -67,12 +67,9 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
global_clock_event->event_handler(global_clock_event);
-#ifdef CONFIG_MCA
- if (MCA_bus) {
- u8 irq_v = inb_p(0x61); /* read the current state */
- outb_p(irq_v|0x80, 0x61); /* reset the IRQ */
- }
-#endif
+ /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
+ if (MCA_bus)
+ outb_p(inb_p(0x61)| 0x80, 0x61);
return IRQ_HANDLED;
}
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