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Date:   Mon, 01 Apr 2013 09:48:23 -0700
From:   David Daney <ddaney.cavm@gmail.com>
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To:     =?ISO-8859-1?Q?Llu=EDs_Batlle_i_Rossell?= <viric@viric.name>,
        Ralf Baechle <ralf@linux-mips.org>,
        Al Cooper <alcooperx@gmail.com>
CC:     linux-mips@linux-mips.org
Subject: Re: FTRACE makes the kernel not boot
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On 03/30/2013 04:29 PM, Lluís Batlle i Rossell wrote:
> Hello,
>
> For a fuloong (loongson2f) I had two configs, one booted and the other not, on
> a linux 3.8. I narrowed down the difference to enabling CONFIG_FTRACE.
>
> Enabling CONFIG_FTRACE makes the kernel not load at all; it even does not print
> any early printk to the serial port.
>
> Do you agree there is a problem with FTRACE? Maybe it is solved already
> in the mips git branch?
>

This is caused by 58b69401c797e (MIPS: Function tracer: Fix broken 
function tracing), which broke ftrace for 64-bit kernels.  The subject 
of the patch is a bit misleading in this respect, it probably should 
have been something like 'MIPS: Function tracer: Break function tracing 
that used to work'

David Daney

> Regards,
> Lluís.
>
>
>