From: Linus Torvalds <torvalds@linux-foundation.org>
To: kyle@mcmartin.ca
Cc: deller@gmx.de, linux-parisc@vger.kernel.org
Subject: Re: [PATCH] parisc: fix unwind with recent gcc versions
Date: Sun, 29 Nov 2009 09:34:45 -0800 (PST) [thread overview]
Message-ID: <alpine.LFD.2.00.0911290929110.3684@localhost.localdomain> (raw)
In-Reply-To: <20091128203311.GA24165@hera.kernel.org>
On Sat, 28 Nov 2009, Kyle McMartin wrote:
>
> From: Helge Deller <deller@gmx.de>
>
> kernel unwinding is broken with gcc >= 4.x. Part of the problem is, that
> binutils seems sensible where the unwind information is stored.
The commentary doesn't seem to make much sense to me. Do you mean
"sensitive" rather than "sensible"? And is it an actual binutils bug, or
what?
Also, are the PARISC people 100% sure that you really want unwinding in
the first place? We got rid of it as being terminally broken on x86,
because tools and asm always got it wrong, and special things like irq
frames etc continually broke it in the most annoying ways possible (ie
WARN_ON() statements became fatal oopses due to unwind errors etc).
Having a tentative and unreliable stack trace is generally better than
a totally broken one.
Linus
next prev parent reply other threads:[~2009-11-29 17:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-28 20:33 [PATCH] parisc: fix unwind with recent gcc versions Kyle McMartin
2009-11-29 17:34 ` Linus Torvalds [this message]
2009-11-29 20:23 ` Helge Deller
2009-11-30 14:14 ` James Bottomley
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