[asahilinux:pr/583 625/972] error[E0277]: the trait bound `VMap<D, R, SIZE>: IoBackend` is not satisfied

[asahilinux:pr/583 625/972] error[E0277]: the trait bound `VMap<D, R, SIZE>: IoBackend` is not satisfied

[kernel test robot]

tree:   https://github.com/AsahiLinux/linux pr/583
head:   cddf57e96d46510a9378b0fda93f6db65e4976a8
commit: 7e2c3ece817a512b6b3facdc1f37969b14a88a49 [625/972] rust: drm/gem: remove DeviceContext from shmem::Object
config: arm64-randconfig-002-20260831 (https://download.01.org/0day-ci/archive/20260902/202609021249.C0H9atEC-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 316b0edee400b3ef72ed0a082dae9bd337ac01a0)
rustc: rustc 1.96.0 (ac68faa20 2026-05-25)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260902/202609021249.C0H9atEC-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609021249.C0H9atEC-lkp@intel.com/

All errors (new ones prefixed by >>):

>> error[E0277]: the trait bound `VMap<D, R, SIZE>: IoBackend` is not satisfied
   --> rust/kernel/drm/gem/shmem.rs:522:58
   |
   522 |         impl<D, R, const SIZE: usize> IoCapable<$ty> for VMap<D, R, SIZE>
   |                                                          ^^^^^^^^^^^^^^^^ unsatisfied trait bound
   ...
   551 | impl_vmap_io_capable!(u16);
   | -------------------------- in this macro invocation
   |
   help: the trait `IoBackend` is not implemented for `VMap<D, R, SIZE>`
   --> rust/kernel/drm/gem/shmem.rs:431:1
   |
   431 | pub struct VMap<D, R, const SIZE: usize = 0>
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: the following other types implement trait `IoBackend`:
   CoherentIoBackend
   IoSysMapBackend
   MmioBackend
   RelaxedMmioBackend
   SysMemBackend
   note: required by a bound in `IoCapable`
   --> rust/kernel/io.rs:272:25
   |
   272 | pub trait IoCapable<T>: IoBackend {
   |                         ^^^^^^^^^ required by this bound in `IoCapable`
   = note: this error originates in the macro `impl_vmap_io_capable` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `VMap<D, R, SIZE>: IoBackend` is not satisfied
   --> rust/kernel/drm/gem/shmem.rs:522:58
   |
   522 |         impl<D, R, const SIZE: usize> IoCapable<$ty> for VMap<D, R, SIZE>
   |                                                          ^^^^^^^^^^^^^^^^ unsatisfied trait bound
   ...
   552 | impl_vmap_io_capable!(u32);
   | -------------------------- in this macro invocation
   |
   help: the trait `IoBackend` is not implemented for `VMap<D, R, SIZE>`
   --> rust/kernel/drm/gem/shmem.rs:431:1
   |
   431 | pub struct VMap<D, R, const SIZE: usize = 0>
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: the following other types implement trait `IoBackend`:
   CoherentIoBackend
   IoSysMapBackend
   MmioBackend
   RelaxedMmioBackend
   SysMemBackend
   note: required by a bound in `IoCapable`
   --> rust/kernel/io.rs:272:25
   |
   272 | pub trait IoCapable<T>: IoBackend {
   |                         ^^^^^^^^^ required by this bound in `IoCapable`
   = note: this error originates in the macro `impl_vmap_io_capable` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `VMap<D, R, SIZE>: IoBackend` is not satisfied
   --> rust/kernel/drm/gem/shmem.rs:522:58
   |
   522 |         impl<D, R, const SIZE: usize> IoCapable<$ty> for VMap<D, R, SIZE>
   |                                                          ^^^^^^^^^^^^^^^^ unsatisfied trait bound
   ...
   554 | impl_vmap_io_capable!(u64);
   | -------------------------- in this macro invocation
   |
   help: the trait `IoBackend` is not implemented for `VMap<D, R, SIZE>`
   --> rust/kernel/drm/gem/shmem.rs:431:1
   |
   431 | pub struct VMap<D, R, const SIZE: usize = 0>
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: the following other types implement trait `IoBackend`:
   CoherentIoBackend
   IoSysMapBackend
   MmioBackend
   RelaxedMmioBackend
   SysMemBackend
   note: required by a bound in `IoCapable`
   --> rust/kernel/io.rs:272:25
   |
   272 | pub trait IoCapable<T>: IoBackend {
   |                         ^^^^^^^^^ required by this bound in `IoCapable`
   = note: this error originates in the macro `impl_vmap_io_capable` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `VMap<D, R, SIZE>: IoBackend` is not satisfied
   --> rust/kernel/drm/gem/shmem.rs:522:58
   |
   522 |         impl<D, R, const SIZE: usize> IoCapable<$ty> for VMap<D, R, SIZE>
   |                                                          ^^^^^^^^^^^^^^^^ unsatisfied trait bound
   ...
   550 | impl_vmap_io_capable!(u8);
   | ------------------------- in this macro invocation
   |
   help: the trait `IoBackend` is not implemented for `VMap<D, R, SIZE>`
   --> rust/kernel/drm/gem/shmem.rs:431:1
   |
   431 | pub struct VMap<D, R, const SIZE: usize = 0>
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: the following other types implement trait `IoBackend`:
   CoherentIoBackend
   IoSysMapBackend
   MmioBackend
   RelaxedMmioBackend
   SysMemBackend
   note: required by a bound in `IoCapable`
   --> rust/kernel/io.rs:272:25
   |
   272 | pub trait IoCapable<T>: IoBackend {
   |                         ^^^^^^^^^ required by this bound in `IoCapable`
   = note: this error originates in the macro `impl_vmap_io_capable` (in Nightly builds, run with -Z macro-backtrace for more info)

--
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