tree 92d08c1e733839c928b1b757f25f9ef6a98bb7d8
parent 87e0ec7a9ff23cdefc8666e6f9cf67787b77bb52
author Alice Ryhl <aliceryhl@google.com> 1789030814 +0000
committer mdb:android-git <superproject-auto-update@invalid> 1789642339 -0700

ANDROID: drivers: reserve ABI padding in device_private

The upstream Rust abstractions for runtime PM [1] need to store a
pointer to Rust-side state in struct device_private. That series has not
landed upstream yet due to unrelated discussion about other parts of the
series, but the GKI ABI freeze is coming up, so reserve the space in the
struct now. This way the field can be added later without breaking the
KMI, by swapping the reservation for the real field with
ANDROID_BACKPORT_USE(0, void *rust_private).

Only the reservation is Android-specific; it exists solely because of
the GKI ABI freeze. The field itself is expected to land upstream, so
android18-7.x will get it from upstream and will not need to carry this
change.

Bug: 513397174
Link: https://lore.kernel.org/rust-for-linux/20260826131213.1820408-1-beata.michalska@arm.com/ [1]
Change-Id: Ic74871f10c04f0181c64604581be66ff39beb4a8
Signed-off-by: Alice Ryhl <aliceryhl@google.com>