Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=500ff08b76878a45391fffc7a4c972883503050e
Commit: 500ff08b76878a45391fffc7a4c972883503050e
Parent: 801740971af7c6256b7ad2472706d43ed008fd3d
Author: Thomas Gleixner <[EMAIL PROTECTED]>
AuthorDate: Fri Oct 12 23:04:06 2007 +0200
Committer: Thomas Gleixner <[EMAIL PROTECTED]>
CommitDate: Fri Oct 12 23:04:06 2007 +0200
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 <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Arjan van de Ven <[EMAIL PROTECTED]>
---
arch/x86/kernel/apic_64.c | 18 ------------------
1 files changed, 0 insertions(+), 18 deletions(-)
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index ce2f801..a73b443 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);
-
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