On Sun, 18 Nov 2007 12:40:16 -0500
Pavel Roskin <[email protected]> wrote:
> Hello!
>
> I'm trying to update a special tracing version of madwifi (driver for
> Atheros wireless cards) for Linux 2.6.24. This version was created to
> help reverse engineering the non-free part of the driver (also known
> as HAL, hardware abstraction layer).
>
> The problem is that functions register_page_fault_notifier() and
> unregister_page_fault_notifier() are gone in the current kernel git
> repository.
>
> They are needed to intercept access to the card by causing page fault
> and intercepting it.
>
> Those functions were removed on i386 platform because kprobes now
> registers the flat handler directly. The log says that other callers
> are supposed to use kprobes now.
>
> But what would be the right way to do it? I can intercept
> do_page_fault() with kprobes, but that looks unsafe, since
> do_page_fault() is used by kprobes internally.
>
> Or maybe I should install a fault handler with register_kprobe()? The
> problem is, it is only called for faults in kp->pre_handler and
> kp->post_handler and for single-stepping. I don't want to single-step
> anything, and moving all driver functionality in kp->pre_handler would
> be strange.
>
> Perhaps I'm missing something obvious. Any help will be appreciated.
>
if it's just for a custom case (as it sounds like).. a simple small
change to the pagefault handler sounds like the easiest thing to do...
(eg just a direct function call to what would have been your notifier)
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