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SubjectRe: [patch-mm 00/28] High resolution timer updates and x86_64 support - V3
On Sat, 23 Jun 2007 13:32:25 -0000 Thomas Gleixner <> wrote:

> The following patch series contains:
> - dyntick bugfixes for -mm (caused by the cpuidle changes in ACPI)
> - updates and improvements to high resolution timer / dynticks
> - high resolution timer / dynticks support for x86_64


time_init() is called before slab is set up. We cannot do memory
allocations inside time_init().

> The patch set has been tested in the -hrt and -rt trees for quite a while
> and the initial problems have been sorted out. Thanks to the folks from the
> PowerTop project for testing and feedback.

hrm. Looks like none of your testers have HPET_ID_LEGSUP hardware. This:

--- a/arch/i386/kernel/hpet.c~a
+++ a/arch/i386/kernel/hpet.c
@@ -376,7 +376,7 @@ int __init hpet_enable(void)


- if (id & HPET_ID_LEGSUP) {
+ if (0 && (id & HPET_ID_LEGSUP)) {
gets it working. It basically nobbles the hpet and the kernel chose the
TSC clocksource instead.

btw, if you want to know why I go on and on about crappy commenting, try to
work out from the kernel source code what HPET_ID_LEGSUP is, and why it
gets special treatment. It is not possible. This is not maintainable

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