876346536c
This patch splits up the rust helpers C file. When rebasing patch sets on upstream linux, merge conflicts in helpers.c is common and time consuming [1]. Thus, split the file so that each kernel component can live in a separate file. This patch lists helper files explicitly and thus conflicts in the file list is still likely. However, they should be more simple to resolve than the conflicts usually seen in helpers.c. [ Removed `README.md` and undeleted the original comment since now, in v3 of the series, we have a `helpers.c` again; which also allows us to keep the "Sorted alphabetically" line and makes the diff easier. In addition, updated the Documentation/ mentions of the file, reworded title and removed blank lines at the end of `page.c`. - Miguel ] Link: https://rust-for-linux.zulipchat.com/#narrow/stream/288089-General/topic/Splitting.20up.20helpers.2Ec/near/426694012 [1] Signed-off-by: Andreas Hindborg <a.hindborg@samsung.com> Reviewed-by: Gary Guo <gary@garyguo.net> Acked-by: Dirk Behme <dirk.behme@de.bosch.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Link: https://lore.kernel.org/r/20240815103016.2771842-1-nmi@metaspace.dk Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
26 lines
1.1 KiB
C
26 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/build_bug.h>
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/*
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* `bindgen` binds the C `size_t` type as the Rust `usize` type, so we can
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* use it in contexts where Rust expects a `usize` like slice (array) indices.
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* `usize` is defined to be the same as C's `uintptr_t` type (can hold any
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* pointer) but not necessarily the same as `size_t` (can hold the size of any
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* single object). Most modern platforms use the same concrete integer type for
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* both of them, but in case we find ourselves on a platform where
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* that's not true, fail early instead of risking ABI or
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* integer-overflow issues.
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*
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* If your platform fails this assertion, it means that you are in
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* danger of integer-overflow bugs (even if you attempt to add
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* `--no-size_t-is-usize`). It may be easiest to change the kernel ABI on
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* your platform such that `size_t` matches `uintptr_t` (i.e., to increase
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* `size_t`, because `uintptr_t` has to be at least as big as `size_t`).
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*/
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static_assert(
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sizeof(size_t) == sizeof(uintptr_t) &&
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__alignof__(size_t) == __alignof__(uintptr_t),
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"Rust code expects C `size_t` to match Rust `usize`"
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);
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