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Do not mark BPF extern C returns as zeroext#158030

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kevin-valerio:fix/bpf-extern-c-narrow-ret
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Do not mark BPF extern C returns as zeroext#158030
kevin-valerio wants to merge 1 commit into
rust-lang:mainfrom
kevin-valerio:fix/bpf-extern-c-narrow-ret

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Fixes #158028

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jun 17, 2026
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rustbot commented Jun 17, 2026

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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @dingxiangfei2009 (or someone else) some time within the next two weeks.

Please see the contribution instructions for more information. Namely, in order to ensure the minimum review times lag, PR authors and assigned reviewers should ensure that the review label (S-waiting-on-review and S-waiting-on-author) stays updated, invoking these commands when appropriate:

  • @rustbot author: the review is finished, PR author should check the comments and take action accordingly
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pub(crate) fn compute_rust_abi_info<Ty>(fn_abi: &mut FnAbi<'_, Ty>) {
if !fn_abi.ret.is_ignore() {
classify_ret(&mut fn_abi.ret);
fn_abi.ret.extend_integer_width_to(32);

@bjorn3 bjorn3 Jun 17, 2026

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I don't think this is necessary. We can do whatever we want for the rust ABI and it probably doesn't matter for performance if the C ABI doesn't do it either.

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Successfully merging this pull request may close these issues.

Wrong expansion of extern "C" u8/u16 returns on bpfel

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