From: Thomas Gleixner Date: Fri, 12 Oct 2007 21:04:06 +0000 (+0200) Subject: x86_64: remove pit synchronization X-Git-Tag: v2.6.24-rc1~1397^2~24 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=500ff08b76878a45391fffc7a4c972883503050e;p=linux-2.6 x86_64: remove pit synchronization The APIC timer setup code synchronizes the local APIC timer to the PIT/HPET. This is pointless as the PIT and the local APIC timer frequency are not correlated and the APIC timer calibration can never be accurate enough to avoid that the local APIC timer and the PIT/HPET drift apart. Simply remove it. Signed-off-by: Thomas Gleixner Signed-off-by: Chris Wright Signed-off-by: Ingo Molnar Signed-off-by: Arjan van de Ven --- diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c index ce2f8015d5..a73b443a12 100644 --- a/arch/x86/kernel/apic_64.c +++ b/arch/x86/kernel/apic_64.c @@ -790,24 +790,6 @@ static void setup_APIC_timer(unsigned int clocks) local_irq_save(flags); - /* wait for irq slice */ - if (hpet_address && hpet_use_timer) { - u32 trigger = hpet_readl(HPET_T0_CMP); - while (hpet_readl(HPET_T0_CMP) == trigger) - /* do nothing */ ; - } else { - int c1, c2; - outb_p(0x00, 0x43); - c2 = inb_p(0x40); - c2 |= inb_p(0x40) << 8; - do { - c1 = c2; - outb_p(0x00, 0x43); - c2 = inb_p(0x40); - c2 |= inb_p(0x40) << 8; - } while (c2 - c1 < 300); - } - irqen = ! cpu_isset(smp_processor_id(), timer_interrupt_broadcast_ipi_mask); __setup_APIC_LVTT(clocks, 0, irqen);