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SubjectRe: Linux 2.6.21-rc1


On Wed, 21 Feb 2007, Daniel Walker wrote:
>
> Here's the final commit from the bisect which caused it . It says "No
> changes to existing functionality" ?

Ok, it wouldn't be the first time some change that is supposed to change
nothing does actually change something.

That said, one thing to worry about when doing bisection: the kernel
configuration.

If you always just do "make oldconfig" or something, the kernel config for
the thing you test will depend on the _previous_ kernel you compiled, and
that is not always what you want. I've once had a failing kernel, did
bisection, and it turned out that since I had gone back in time to before
the option that caused the failure even existed, I had (by mistake) then
compiled some of the later kernels without that option enabled, and called
them "good".

The end result: "git bisect" didn't actually end up pointing to the right
commit, just because I had effectively lied to it.

That said, considering that you did get a commit that doesn't look
entirely unlikely (and that clearly changes things that are relevant), I
suspect you did actually find the right one.

Linus
---
> commit e9e2cdb412412326c4827fc78ba27f410d837e6e
> Author: Thomas Gleixner <tglx@linutronix.de>
> Date: Fri Feb 16 01:28:04 2007 -0800
>
> [PATCH] clockevents: i386 drivers
>
> Add clockevent drivers for i386: lapic (local) and PIT/HPET (global). Update
> the timer IRQ to call into the PIT/HPET driver's event handler and the
> lapic-timer IRQ to call into the lapic clockevent driver. The assignement of
> timer functionality is delegated to the core framework code and replaces the
> compile and runtime evalution in do_timer_interrupt_hook()
>
> Use the clockevents broadcast support and implement the lapic_broadcast
> function for ACPI.
>
> No changes to existing functionality.
>
>
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