REGRESSION: armv7 build mismatched types

[Rudraksha Gupta <guptarud@gmail.com>]

Logs: https://gitlab.postmarketos.org/LogicalErzor/pmaports/-/jobs/1368490

Archive: 
https://web.archive.org/web/20250530060232/https://gitlab.postmarketos.org/LogicalErzor/pmaports/-/jobs/1368490/raw


Snip:

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|EXPORTS rust/exports_core_generated.h|
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RUSTC L rust/compiler_builtins.o
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RUSTC L rust/ffi.o
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RUSTC L rust/build_error.o
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RUSTC L rust/pin_init.o
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RUSTC L rust/bindings.o
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RUSTC L rust/uapi.o
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EXPORTS rust/exports_bindings_generated.h
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RUSTC L rust/kernel.o
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error[E0308]: mismatched types
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--> rust/kernel/lib.rs:234:45
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234 | $crate::assert_same_type(field_ptr, (&raw const 
(*container_ptr).$($fields)*).cast_mut());
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| ------------------------ --------- 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*const 
drm_device`, found `*mut Opaque<drm_device>`
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| | |
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| | expected all arguments to be this `*const drm_device` type because 
they need to match the type of this parameter
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| arguments to this function are incorrect
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::: rust/kernel/drm/device.rs:140:18
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140 | unsafe { crate::container_of!(ptr, Self, dev) }.cast_mut()
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| ------------------------------------ in this macro invocation
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= note: expected raw pointer `*const drm_device`
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found raw pointer `*mut Opaque<drm_device>`
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note: function defined here
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--> rust/kernel/lib.rs:241:8
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241 | pub fn assert_same_type<T>(_: T, _: T) {}
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| ^^^^^^^^^^^^^^^^ - ---- ---- this parameter needs to match the `*const 
drm_device` type of parameter #1
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| | |
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| | parameter #2 needs to match the `*const drm_device` type of this 
parameter
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| parameter #1 and parameter #2 both reference this parameter `T`
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= note: this error originates in the macro `crate::container_of` (in 
Nightly builds, run with -Z macro-backtrace for more info)
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error[E0308]: mismatched types
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--> rust/kernel/lib.rs:234:45
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234 | $crate::assert_same_type(field_ptr, (&raw const 
(*container_ptr).$($fields)*).cast_mut());
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| ------------------------ --------- 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*mut 
drm_gem_object`, found `*mut Opaque<drm_gem_object>`
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| | |
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| | expected all arguments to be this `*mut drm_gem_object` type because 
they need to match the type of this parameter
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| arguments to this function are incorrect
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::: rust/kernel/drm/gem/mod.rs:130:20
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130 | unsafe { &*crate::container_of!(self_ptr, Object<T>, obj) }
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| ---------------------------------------------- in this macro invocation
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= note: expected raw pointer `*mut drm_gem_object`
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found raw pointer `*mut Opaque<drm_gem_object>`
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note: function defined here
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--> rust/kernel/lib.rs:241:8
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241 | pub fn assert_same_type<T>(_: T, _: T) {}
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| ^^^^^^^^^^^^^^^^ - ---- ---- this parameter needs to match the `*mut 
drm_gem_object` type of parameter #1
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| | |
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| | parameter #2 needs to match the `*mut drm_gem_object` type of this 
parameter
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| parameter #1 and parameter #2 both reference this parameter `T`
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= note: this error originates in the macro `crate::container_of` (in 
Nightly builds, run with -Z macro-backtrace for more info)
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error[E0308]: mismatched types
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--> rust/kernel/lib.rs:234:45
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234 | $crate::assert_same_type(field_ptr, (&raw const 
(*container_ptr).$($fields)*).cast_mut());
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| ------------------------ --------- 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*mut 
drm_gem_object`, found `*mut Opaque<drm_gem_object>`
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| | |
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| | expected all arguments to be this `*mut drm_gem_object` type because 
they need to match the type of this parameter
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| arguments to this function are incorrect
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::: rust/kernel/drm/gem/mod.rs:273:29
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273 | let this = unsafe { crate::container_of!(obj, Self, obj) };
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| ------------------------------------ in this macro invocation
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= note: expected raw pointer `*mut drm_gem_object`
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found raw pointer `*mut Opaque<drm_gem_object>`
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note: function defined here
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--> rust/kernel/lib.rs:241:8
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241 | pub fn assert_same_type<T>(_: T, _: T) {}
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| ^^^^^^^^^^^^^^^^ - ---- ---- this parameter needs to match the `*mut 
drm_gem_object` type of parameter #1
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| | |
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| | parameter #2 needs to match the `*mut drm_gem_object` type of this 
parameter
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| parameter #1 and parameter #2 both reference this parameter `T`
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= note: this error originates in the macro `crate::container_of` (in 
Nightly builds, run with -Z macro-backtrace for more info)
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0308`.
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make[2]: *** [rust/Makefile:538: rust/kernel.o] Error 1
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make[1]: *** 
[/home/pmos/build/src/linux-next-next-20250530/Makefile:1285: prepare] 
Error 2
||make: *** [Makefile:248: __sub-make] Error 2|


Bad: next-20250530

Good: next-20250528


Likely introduced with: 
https://lore.kernel.org/all/CANiq72mFiCrzawVUVOU2giJtBVsRdAO3sGtDsZptPuFvmid3EQ@mail.gmail.com/


Repo: 
https://gitlab.postmarketos.org/LogicalErzor/pmaports/-/tree/rust/device/testing/linux-next

How it's built (Alpine-like build system):

- https://archive.ph/vxEmk

Config fragments (in addition to qcom_defconfig):

- https://archive.ph/q4hfc

- https://archive.ph/RKgFf