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Date: Wed, 12 Mar 2003 07:20:39 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: Arjan van de Ven <arjanv@redhat.com>
cc: Szakacsits Szabolcs <szaka@sienet.hu>, <linux-kernel@vger.kernel.org>
Subject: Re: 2.5.63 accesses below %esp (was: Re: ntfs OOPS (2.5.63))
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On 12 Mar 2003, Arjan van de Ven wrote:
> 
> and all vendors always ship -fno-frame-pointer kernels so far so those
> users are ok! Until recently there was no way to build a non
> -fno-frame-pointer kernel!

Not entirely true.

Even with the traditional -fomit-frame-pointer build, "sched.c" has always
been built with -fno-fomit-frame-pointer in order to get the correct
"wchan" of callers of schedule() and wait_on().

See kernel/Makefile for details.

So yes, old kernels (and CONFIG_FRAME_POINTER=n) have traditionally
avoided the bug _mostly_. But it could still bite us in some rather
important functions.

		Linus

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