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

On Wed, Aug 05, 2026 at 05:40:42PM +0530, Mukesh Kumar Chaurasiya wrote:

On Tue, Aug 04, 2026 at 01:22:17PM -0700, Nathan Chancellor wrote:

quoted

On Tue, Aug 04, 2026 at 12:11:57PM +0200, Link Mauve wrote:

quoted

Hi,

On Mon, Aug 03, 2026 at 12:27:13PM +0530, Madhavan Srinivasan wrote:

quoted

On Wed, 08 Jul 2026 13:54:47 +0530, Mukesh Kumar Chaurasiya (IBM) wrote:

quoted

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:

I also see the following warnings (in addition to that error):

  warning: unknown and unstable feature specified for `-Ctarget-feature`: `mma`
    |
    = note: it is still passed through to the codegen backend, but use of this feature might be unsound and the behavior of this feature can change in the future
    = help: consider filing a feature request

  warning: unstable feature specified for `-Ctarget-feature`: `vsx`
    |
    = note: this feature is not stably supported; its behavior can change in the future

  warning: unknown and unstable feature specified for `-Ctarget-feature`: `hard-float`
    |
    = note: it is still passed through to the codegen backend, but use of this feature might be unsound and the behavior of this feature can change in the future
    = help: consider filing a feature request

  warning: unstable feature specified for `-Ctarget-feature`: `altivec`
    |
    = note: this feature is not stably supported; its behavior can change in the future

Hey Nathan,

For these i'll raise issues.

Here's bug on rustc for the same.
https://github.com/rust-lang/rust/issues/160561

Regards,
Mukesh