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

[Mathieu Malaterre]

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 ?

> >
> > So we could have a 32-bit allmodconfig, but we'd need to chose one of
> > the above, and we'd still only be testing some of the code.
> >
> > Having said that you're the 2nd person to ask about this, so we should
> > clearly do something to make a 32-bit allmodconfig easier, even if it's
> > not perfect.
> >
> > cheers