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| author | Thomas Gleixner | 2009-08-20 15:59:35 +0200 |
|---|---|---|
| committer | Thomas Gleixner | 2009-08-31 09:35:46 +0200 |
| commit | 0be6939422eb2f54df4b3d8763c569c6759c1a42 (patch) | |
| tree | 0bfde8bc4c230f8a5f0f5f2651c8ebc366020124 /arch/x86/kernel/time_32.c | |
| parent | x86: Simplify timer_ack magic in time_32.c (diff) | |
| download | kernel-qcow2-linux-0be6939422eb2f54df4b3d8763c569c6759c1a42.tar.gz kernel-qcow2-linux-0be6939422eb2f54df4b3d8763c569c6759c1a42.tar.xz kernel-qcow2-linux-0be6939422eb2f54df4b3d8763c569c6759c1a42.zip | |
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/x86/kernel/time_32.c')
| -rw-r--r-- | arch/x86/kernel/time_32.c | 18 |
1 files changed, 3 insertions, 15 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; } |