Randy,

On Mon, Jul 9, 2018 at 2:00 PM Mathieu Malaterre [off-list ref] wrote:

On Sun, Jul 8, 2018 at 1:53 PM Michael Ellerman [off-list ref] wrote:

quoted

Randy Dunlap [off-list ref] writes:

quoted

Hi,

Is there a good way (or a shortcut) to do something like:

The best I know of is:

quoted

$ 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 ?

quoted

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