diff options
| author | Martijn Coenen <maco@google.com> | 2018-05-11 01:45:24 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-14 16:06:48 +0200 |
| commit | 1190b4e38f97023154e6b3bef61b251aa5f970d0 (patch) | |
| tree | 635a6844ef73eca8a3bb8100310bda0a8e34214e /drivers/android/binder.c | |
| parent | 176c2572cd15e40bdbb3cc197d0b409f1f24ab22 (diff) | |
ANDROID: binder: remove 32-bit binder interface.
New devices launching with Android P need to use the 64-bit
binder interface, even on 32-bit SoCs [0].
This change removes the Kconfig option to select the 32-bit
binder interface. We don't think this will affect existing
userspace for the following reasons:
1) The latest Android common tree is 4.14, so we don't
believe any Android devices are on kernels >4.14.
2) Android devices launch on an LTS release and stick with
it, so we wouldn't expect devices running on <= 4.14 now
to upgrade to 4.17 or later. But even if they did, they'd
rebuild the world (kernel + userspace) anyway.
3) Other userspaces like 'anbox' are already using the
64-bit interface.
Note that this change doesn't remove the 32-bit UAPI
itself; the reason for that is that Android userspace
always uses the latest UAPI headers from upstream, and
userspace retains 32-bit support for devices that are
upgrading. This will be removed as well in 2-3 years,
at which point we can remove the code from the UAPI
as well.
Finally, this change introduces build errors on archs where
64-bit get_user/put_user is not supported, so make binder
unavailable on m68k (which wouldn't want it anyway).
[0]: https://android-review.googlesource.com/c/platform/build/+/595193
Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/android/binder.c')
| -rw-r--r-- | drivers/android/binder.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 4eab5be3d00f..35f48a39144c 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -72,10 +72,6 @@ #include <linux/security.h> #include <linux/spinlock.h> -#ifdef CONFIG_ANDROID_BINDER_IPC_32BIT -#define BINDER_IPC_32BIT 1 -#endif - #include <uapi/linux/android/binder.h> #include "binder_alloc.h" #include "binder_trace.h" |