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Implement a generic interface for memory barriers (full system/DMA/SMP). The interface uses a parameter to force user to specify their intent with barriers. Provide `Read`, `Write`, `Full` orderings which map to the existing `rmb()`, `wmb()` and `mb()`. Generic is used here instead of providing individual standalone functions to reduce code duplication; for example, the `CONFIG_SMP` check in `smp_mb` is uniformly implemented for all SMP barriers. This could extend to `virt_mb`'s if they're introduced in the future. It would also make it easier if new ordering types are introduced in the future (e.g. `Acquire`, `Release`). Signed-off-by: Gary Guo <gary@garyguo.net> Signed-off-by: Boqun Feng <boqun@kernel.org> Link: https://patch.msgid.link/20260609-rust-barrier-v2-2-30fcc48e1cd0@garyguo.net