[PATCH] ARM: PJ4: allow building in Thumb-2 mode

[Olof Johansson]

On Mon, Nov 24, 2014 at 9:17 AM, Arnd Bergmann <arnd at arndb.de> wrote:
> On Monday 24 November 2014 16:34:47 Ard Biesheuvel wrote:
>> On 24 November 2014 at 16:29, Arnd Bergmann <arnd at arndb.de> wrote:
>> > On Monday 24 November 2014 12:56:40 Ard Biesheuvel wrote:
>> >> Two files that get included when building the multi_v7_defconfig target
>> >> fail to build when selecting THUMB2_KERNEL for this configuration.
>> >>
>> >> In both cases, we can just build the file as ARM code, as none of its
>> >> symbols are exported to modules, so there are no interworking concerns.
>> >> In the iwmmxt.S case, add ENDPROC() declarations so the symbols are
>> >> annotated as functions, resulting in the linker to emit the appropriate
>> >> mode switches.
>> >>
>> >> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
>> >
>> > Ah, very nice. I tried this before, but my version didn't actually
>> > work, presumably because I didn't know about the ENDPROC() stuff.
>> >
>> > Have you tested this on a machine that has IWMMXT enabled?
>> >
>>
>> No, I don't have access to such a machine, unfortunately.
>
> Adding a few mvebu folks to Cc, maybe one of them can test your patch.
> It's also possible that Olof or Kevin have a PJ4 machine with iwmmxt
> in their boot farms.

I have a Cubox with Dove, which does implement iWMMXt v2, based on
boot messages.

I however do not have any kind of userspace programs that make use of
it to test with.


-Olof