linux-kernel - Re: [git pull] x86 arch updates for v2.6.25

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Message-ID: <20080208185719.GA11573@one.firstfloor.org>
Date:	Fri, 8 Feb 2008 19:57:19 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Jan Kiszka <jan.kiszka@...mens.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jason Wessel <jason.wessel@...driver.com>
Subject: Re: [git pull] x86 arch updates for v2.6.25

> /me was once wondering as well why kgdb installs a seconds way of
> handling (its own) faults. Jason explained to me that this approach is
> more robust against corruption along the normal fix-up path.

That's 100% bogus.

> 
> If you recall the issues (and they are still present), it would be nice
> to have them listed. kgdb suffered a lot from historic cruft, but we
> already remove at least some of it over the last patching rounds.
> Whatever remains should be addressed ASAP.

I sent Jason a couple of mails last time when he posted (and before that the
previous maintainer when he tried to merge it).   All were
fairly "beratungsresistent".

If you're truly interested i can dig out the mails or do a fresh review.

Long ago I did a quite clean x86-64 kgdb for Linux 2.4 based on the 
old 2.4 stub that dropped in without any strange other hooks
(except for a straight forward change to the serial code). It worked
just fine this way.

-Andi

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