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The PL011 device's C implementation exposes its PL011State struct to users of the device, and one common usage pattern is to embed that struct into the user's own state struct. (The internals of the struct are technically visible to the C user of the device, but in practice are treated as implementation details.) This means that the Rust version of the state struct must not be larger than the C version's struct; otherwise it will trip a runtime assertion in object_initialize_type() when the C user attempts to in-place initialize the type. Add a compile-time assertion on the Rust side, so that if we accidentally make the Rust device state larger we know immediately that we need to expand the padding in the C version of the struct. Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Link: https://lore.kernel.org/r/20250321112523.1774131-4-peter.maydell@linaro.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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