[PATCH] ARM: PJ4: move coprocessor register access sequences to iwmmxt.S

[Ard Biesheuvel]

On 13 November 2015 at 19:48, Stephen Boyd <sboyd at codeaurora.org> wrote:
> On 11/13, Ard Biesheuvel wrote:
>> The PJ4 inline asm sequences in pj4-cp0.c cannot be built in Thumb-2 mode,
>> due to the way it performs arithmetic on the program counter, so it is
>> built in ARM mode instead. However, building C files in ARM mode under
>> CONFIG_THUMB2_KERNEL is problematic, since the instrumentation performed
>> by subsystems like ftrace does not expect having to deal with interworking
>> branches.
>>
>> So instead, revert to building pj4-cp0.c in Thumb-2 mode, and move the
>> offending sequence to iwmmxt.S, which is not instrumented anyway, and is
>> already built in ARM mode unconditionally.
>>
>> Reported-by: Stephen Boyd <sboyd at codeaurora.org>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
>> ---
>
> Tested-by: Stephen Boyd <sboyd at codeaurora.org>
>

Thanks.

I've put this into the patch system (8452/1)