linux-kernel - Re: Linux 2.6.21-rc1

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Date:	Wed, 21 Feb 2007 13:06:17 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Daniel Walker <dwalker@...sta.com>
cc:	tglx@...utronix.de,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	mingo@...e.hu
Subject: Re: 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@...utronix.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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