linux-kernel - Re: PATCH] debug: add notifier chain debugging

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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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