Re: [PATCH] ANDROID: binder: remove 32-bit binder interface.

[Christoph Hellwig]

On Fri, May 11, 2018 at 09:57:52AM +0200, Martijn Coenen wrote:
> On Sat, May 5, 2018 at 2:10 PM, kbuild test robot <lkp@xxxxxxxxx> wrote:
> >    drivers/android/binder.o: In function `binder_thread_write':
> >>> binder.c:(.text+0x6a16): undefined reference to `__get_user_bad'
> 
> Looks like m68k doesn't support 64-bit get_user(). I could just have
> binder depend on !CONFIG_M68K, but there may be other architectures
> still that don't support this. Another alternative would be to
> whitelist the architectures Android supports - eg arm, arm64, x86,
> x86_64. But I'm not sure if arch-limited drivers are considered bad
> form. Does anybody have suggestions for how to deal with this?

The proper fix is to just support 640bit get/put_user on m68k instead
of working around this.