CONFIG_ANDROID_BINDER_IPC=y (Re: powerpc: 32BIT vs. 64BIT (PPC32 vs. PPC64))

[Randy Dunlap]

On 07/13/2018 04:24 PM, Randy Dunlap wrote:
> On 07/13/2018 04:41 AM, Mathieu Malaterre wrote:
>> Randy,
>>
>> On Mon, Jul 9, 2018 at 2:00 PM Mathieu Malaterre <malat at debian.org> wrote:
>>>
>>> On Sun, Jul 8, 2018 at 1:53 PM Michael Ellerman <mpe at ellerman.id.au> wrote:
>>>>
>>>> Randy Dunlap <rdunlap at infradead.org> writes:
>>>>> Hi,
>>>>>
>>>>> Is there a good way (or a shortcut) to do something like:
>>>>
>>>> The best I know of is:
>>>>
>>>>> $ make ARCH=powerpc O=PPC32 [other_options] allmodconfig
>>>>>   to get a PPC32/32BIT allmodconfig
>>>>
>>>> $ echo CONFIG_PPC64=n > allmod.config
>>>> $ KCONFIG_ALLCONFIG=1 make allmodconfig
>>>> $ grep PPC32 .config
>>>> CONFIG_PPC32=y
>>>>
>>>> Which is still a bit clunky.
>>>>
>>>>
>>>> I looked at this a while back and the problem we have is that the 32-bit
>>>> kernel is not a single thing. There are multiple 32-bit platforms which
>>>> are mutually exclusive.
>>>>
>>>> eg, from menuconfig:
>>>>
>>>>  - 512x/52xx/6xx/7xx/74xx/82xx/83xx/86xx
>>>>  - Freescale 85xx
>>>>  - Freescale 8xx
>>>>  - AMCC 40x
>>>>  - AMCC 44x, 46x or 47x
>>>>  - Freescale e200
>>>
>>> Most Linux distro seems to have drop support for ppc32. So I'd suggest
>>> to pick Debian powperc default config (but I agree that I am a little
>>> biased here).
>>
>> I tried an allmode as suggest by Michael (above). But I get a build error:
>>
>>   MODPOST vmlinux.o
>> drivers/android/binder.o: In function `binder_thread_write':
>> binder.c:(.text+0xc750): undefined reference to `__get_user_bad'
>> binder.c:(.text+0xc76c): undefined reference to `__get_user_bad'
>> binder.c:(.text+0xc790): undefined reference to `__get_user_bad'
>> binder.c:(.text+0xc7d4): undefined reference to `__get_user_bad'
>> binder.c:(.text+0xc7f4): undefined reference to `__get_user_bad'
>>
>>
>> So for now I need to do: CONFIG_ANDROID_BINDER_IPC=n
>>
>> How did you get passed this build failure ?
> 
> Hi,
> 
> I am not seeing an error on that driver build.
> 
> I am using gcc 8.1.0 from kernel.org:
> https://mirrors.edge.kernel.org/pub/tools/crosstool/
> 
> and building on x86_64.

Hi Mathieu,

I do see this build error (slightly different undefined reference though)
when I do an arch/microblaze/ cross-build:

drivers/android/binder.o: In function `binder_thread_write':
drivers/android/.tmp_gl_binder.o:(.text+0xcba8): undefined reference to `__user_bad'
drivers/android/.tmp_gl_binder.o:(.text+0xcbd4): undefined reference to `__user_bad'
drivers/android/.tmp_gl_binder.o:(.text+0xcfbc): undefined reference to `__user_bad'
drivers/android/.tmp_gl_binder.o:(.text+0xd648): undefined reference to `__user_bad'
drivers/android/.tmp_gl_binder.o:(.text+0xdbc0): undefined reference to `__user_bad'


-- 
~Randy