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

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Message-ID: <47AC95FC.5090701@siemens.com>
Date:	Fri, 08 Feb 2008 18:48:44 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	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

Andi Kleen wrote:
>> kgdb? Not so interesting. We have many more hard problems happening at 
>> user sites, not in developer hands.
> 
> The other problem with the current kgdb code is that it has some serious
> problems. e.g. it reinvents various kernel interfaces that already
> exist -- one example is that it adds new notify_die()s just to reimplement
> the standard __ex_table exceptions in a bogus way.

/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. Maybe he
can elaborate better than I why this is useful (or what real-life bug
once encouraged the current design).

> Couple of other issues. So even if it was a good idea to merge the
> code is not really fully in merge shape anyways.

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.

Jan

-- 
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
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