AtomicU64 on 32-bit architectures

[FlyGoat]

With my WIP MIPS patches, rust compile may fail at:

  RUSTC L rust/kernel.o
error[E0432]: unresolved import `core::sync::atomic::AtomicU64`
  --> rust/kernel/block/mq/operations.rs:14:33
   |
14 | use core::{marker::PhantomData, sync::atomic::AtomicU64, sync::atomic::Ordering};
   |                                 ^^^^^^^^^^^^^^---------
   |                                 |             |
   |                                 |             help: a similar name exists in the module: `AtomicU32`
   |                                 no `AtomicU64` in `sync::atomic`

We should probably wire up atomic64.h C code for Rust side AtomicU64.

[fbq]

The plan is to use our own atomic implementations (same as C). It's a WIP

[metaspace]

For a quick fix you can change it to U32 or usize.

[GuilhermeGiacomoSimoes]

@FlyGoat
can you take for me a link for your patchs, and one brief explanation of how I can reproduce this issue ?
I think that I can work on this, I'm a beginer in the kernel

[FlyGoat]

Hi @GuilhermeGiacomoSimoes:

Patch: https://lore.kernel.org/linux-mips/[email protected]/

make ARCH=mips 32r2el_defconfig LLVM=1

Then enable rust stuff in menuconfig and build kernel.

Thanks

[fbq]

I think that I can work on this, I'm a beginer in the kernel

As I mentioned earlier, this issue will be resolved after our atomic API which I'm currently working on.

[GuilhermeGiacomoSimoes]

@fbq ok