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Message-ID: <20080826064617.0c0fd340@infradead.org>
Date: Tue, 26 Aug 2008 06:46:17 -0700
From: Arjan van de Ven <arjan@...radead.org>
To: "Tony Luck" <tony.luck@...el.com>
Cc: linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: PATCH] debug: add notifier chain debugging
On Mon, 25 Aug 2008 22:08:00 -0700
"Tony Luck" <tony.luck@...el.com> wrote:
> >> This breaks on ia64 (and pa-risc I think) where function pointers
> >> don't point directly at the code, they point to a {code,data}
> >> structure which is itself located in data space, not text space.
> >
> > is there a way to go to the actual address? I'm sure this is a bit
> > more common.... (like kallsyms!)
>
> See dereference_function_descriptor() in lib/vsprintf.c (where it will
> be clear that my memory was wrong and that PPC64 is the other
> architecture that needs this).
>
> Perhaps this needs to be moved to some place in asm-generic so
> that it can be used by code like your sanity check?
or we make a func_is_kernel_text() thast maps underneath...
after all that'll be a common use of this function ;)
>
> -Tony
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