Claude review: rust: rename `kernel::c_str!` to `str_to_cstr!`

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Overall Series Review

Subject: rust: rename `kernel::c_str!` to `str_to_cstr!`
Author: Tamir Duberstein <tamird@kernel.org>
Patches: 3
Reviewed: 2026-03-03T13:00:33.239684

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This is a single-patch rename of the `kernel::c_str!` macro to `kernel::str_to_cstr!`. The motivation is that since Rust 1.77, C string literals (`c"..."`) are the preferred way to create `&CStr` values from string literals, and this macro now only exists for non-literal cases (e.g., wrapping `stringify!()`, `concat!()`, `file!()` in macro contexts). The rename makes its narrower intended purpose explicit.

The patch is clean, mechanical, and complete. All 8 call sites within `rust/kernel/` are updated, which matches the full set of files found via grep. The macro is not in the prelude and has no external consumers in-tree (drivers, samples, etc.), so nothing is missed. The updated documentation clearly describes why the macro still exists and when to use it versus C string literals.

Already has Acked-by from Greg Kroah-Hartman and Reviewed-by from Alice Ryhl.

**Verdict:** This looks correct and ready to merge with one very minor nit.

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