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To: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
       Arjan van de Ven <arjan@linux.intel.com>,
       Pekka Enberg <penberg@cs.helsinki.fi>, x86@kernel.org,
       linux-kernel@vger.kernel.org
Subject: Re: [RESEND][PATCH] x86: don't destroy %rbp on kernel-mode faults
From: Andi Kleen <andi@firstfloor.org>
References: <20080627152216.GA8852@damson.getinternet.no>
Date: Fri, 27 Jun 2008 18:12:50 +0200
In-Reply-To: <20080627152216.GA8852@damson.getinternet.no> (Vegard Nossum's message of "Fri, 27 Jun 2008 17:22:17 +0200")
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Vegard Nossum <vegard.nossum@gmail.com> writes:

> Hi,
>
> I sent this patch earlier, but it was never queued. It has been acked by
> Arjan and acked informally by Andi. I hope this can make it for 2.6.27.

Just to clarify the "informal ack" was (paraphrased): 

All the .S code was always designed to support dwarf2 unwinding and
not frame pointers and there are a lot more places that don't care
about frame pointers. So even if you fix it here it'll still break in
other places.

-Andi