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

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Message-ID: <12c511ca0808251539w6f00a216s86a09a532c553a34@mail.gmail.com>
Date:	Mon, 25 Aug 2008 15:39:13 -0700
From:	"Tony Luck" <tony.luck@...el.com>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu
Subject: Re: PATCH] debug: add notifier chain debugging

On Fri, Aug 15, 2008 at 3:29 PM, Arjan van de Ven <arjan@...radead.org> wrote:
> +       if (!kernel_text_address((unsigned long)n->notifier_call)) {
> +               WARN(1, "Invalid notifier registered!");
> +               return 0;
> +       }

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.

-Tony
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