From: Martijn Coenen Date: Fri, 11 May 2018 08:45:24 +0000 (-0700) Subject: UPSTREAM: ANDROID: binder: remove 32-bit binder interface. X-Git-Tag: khadas-vims-v0.9.6-release~1584^2~9 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=61a775a14bd860aa6ef226284ae9affb785a4628;p=platform%2Fkernel%2Flinux-amlogic.git UPSTREAM: 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 Signed-off-by: Greg Kroah-Hartman (cherry picked from commit 1190b4e38f97023154e6b3bef61b251aa5f970d0) Change-Id: I73dadf1d7b45a42bb18be5d5d3f5c090e61866de --- diff --git a/drivers/android/Kconfig b/drivers/android/Kconfig index 01de42c..63ed9ce 100644 --- a/drivers/android/Kconfig +++ b/drivers/android/Kconfig @@ -9,7 +9,7 @@ if ANDROID config ANDROID_BINDER_IPC bool "Android Binder IPC Driver" - depends on MMU + depends on MMU && !M68K default n ---help--- Binder is used in Android for both communication between processes, @@ -31,19 +31,6 @@ config ANDROID_BINDER_DEVICES created. Each binder device has its own context manager, and is therefore logically separated from the other devices. -config ANDROID_BINDER_IPC_32BIT - bool - depends on !64BIT && ANDROID_BINDER_IPC - default y - ---help--- - The Binder API has been changed to support both 32 and 64bit - applications in a mixed environment. - - Enable this to support an old 32-bit Android user-space (v4.4 and - earlier). - - Note that enabling this will break newer Android user-space. - config ANDROID_BINDER_IPC_SELFTEST bool "Android Binder IPC Driver Selftest" depends on ANDROID_BINDER_IPC diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 754a320..6121d01 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -71,10 +71,6 @@ #include #include -#ifdef CONFIG_ANDROID_BINDER_IPC_32BIT -#define BINDER_IPC_32BIT 1 -#endif - #include #include "binder_alloc.h" #include "binder_trace.h"