Re: Dynamic-ftrace not working in PlayStation3

On Sat, 31 Jan 2009, Arnd Bergmann wrote:

On Saturday 31 January 2009, Geoff Levand wrote:

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So I take it that the above showed that the code worked for some?

In my trials it blows up on the first load_module() call, and for my
config that was usbcore:

I looked into it some more with Remis yesterday, and we got ftrace
working by building usbcore and alsa into the kernel. Incidentally,
usbcore is the largest module in this installation (~3MB), which
indicates that it is in some way either related to the size of the
module.

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This ptr of 5f666f725f726573 seems bogus.  I think this code is not
working correctly:

This is an ascii string "_for_res", probably part of
usb_lock_device_for_reset. We saw the same behaviour, but
a different string.

OK, I've been able to reproduce it. It looks like the assumptions of the 
trampoline that I've made is not correct if the size of the module is over 
some limit.  I had to make usb-core into a module, and I see the same 
bug.

I'll take a deeper look into it.

-- Steve