Re: [PATCH V17 0/7] Rust Support for powerpc

Hi,

On Mon, Aug 03, 2026 at 12:27:13PM +0530, Madhavan Srinivasan wrote:
> On Wed, 08 Jul 2026 13:54:47 +0530, Mukesh Kumar Chaurasiya (IBM) wrote:
> > Enable experimental rust support for ppc64le and ppc32be. The patch for
> > ppc32 has been provided by Link Mauve[1] and ppc64le support[2] has been
> > merged over it. ppc32 needs some toolchain fixes mentioned in the patch
> > `rust: Add PowerPC support` and the discussion for that is done here[1].
> > 
> > This has been tested on
> > - powernv9 hardware
> > - pseries P11 hardware
> > - pseries(9, 10) qemu
> > - powernv(9, 10) qemu
> > - rustdoc on x86 and powerpc64le
> > - rusttest on x86 and powerpc64le
> > 
> > [...]
> 
> Applied to powerpc/next.
> 
> [1/7] rust: Fix "multiple candidates for rmeta dependency core" error
>       https://git.kernel.org/powerpc/c/00cdfd072c709c608606461d7d44d4613119bfa9
> [2/7] dma-resv: Fix undefined symbol when CONFIG_DMA_SHARED_BUFFER is disabled
>       https://git.kernel.org/powerpc/c/be809b60cbb61aab96179f44ac3670242ae72996
> [3/7] powerpc/jump_label: adjust inline asm to be consistent
>       https://git.kernel.org/powerpc/c/13244c0a40139fe66c4c5c5655f4d732a6002957
> [4/7] rust/powerpc: Set min rustc version for powerpc
>       https://git.kernel.org/powerpc/c/e299147cdc8e19c6421a6b7863dc82a35b09d967
> [5/7] rust: Make __udivdi3() and __umoddi3() panic
>       https://git.kernel.org/powerpc/c/c93c194e4ee71a734986fd99a8b1ec9fbb7a9b8b
> [6/7] rust: Add PowerPC support
>       https://git.kernel.org/powerpc/c/73b741adb264967093ef4eb59905618a7e0d0de0
> [7/7] powerpc: Enable Rust for ppc64le
>       https://git.kernel.org/powerpc/c/bc87cbdb952e9223616b839d64bdb4723aa2ed1d
> 
> cheers
> 

I just tested those again in linux-next, with the Wii support series on
top, but now the kernel fails to build due to ARCH_WARN_ASM and
ARCH_WARN_REACHABLE not being defined on PowerPC:
```
error: no rules expected `ARCH_WARN_ASM`
   --> /home/linkmauve/dev/linux/wii/rust/kernel/generated_arch_warn_asm.rs:1:28
    |
  1 | ::kernel::concat_literals!(ARCH_WARN_ASM("{file}", "{line}", "{flags}", "{size}"))
    |                            ^^^^^^^^^^^^^ no rules expected this token in macro call
    |
   ::: ../rust/kernel/lib.rs:279:1
    |
279 | macro_rules! concat_literals {
    | ---------------------------- when calling this macro
    |
    = note: while trying to match sequence start

error: no rules expected `ARCH_WARN_REACHABLE`
   --> /home/linkmauve/dev/linux/wii/rust/kernel/generated_arch_reachable_asm.rs:1:28
    |
  1 | ::kernel::concat_literals!(ARCH_WARN_REACHABLE)
    |                            ^^^^^^^^^^^^^^^^^^^ no rules expected this token in macro call
    |
   ::: ../rust/kernel/lib.rs:279:1
    |
279 | macro_rules! concat_literals {
    | ---------------------------- when calling this macro
    |
    = note: while trying to match sequence start

error: aborting due to 2 previous errors
```

This is in addition to the bindings::kvfree_call_rcu() call, but that
one is already being handled in a different thread.

-- 
Link Mauve