rust: sync: add `Arc` for ref-counted allocations

2023-01-16T21:20:03Z

This is a basic implementation of `Arc` backed by C's `refcount_t`. It allows Rust code to idiomatically allocate memory that is ref-counted. Cc: Will Deacon Cc: Peter Zijlstra Cc: Boqun Feng Cc: Mark Rutland Signed-off-by: Wedson Almeida Filho Reviewed-by: Alice Ryhl Reviewed-by: Gary Guo Reviewed-by: Vincenzo Palazzo Acked-by: Boqun Feng Signed-off-by: Miguel Ojeda

rust: add C helpers

2022-09-28T06:56:43Z

Introduces the source file that will contain forwarders to C macros and inlined functions. Initially this only contains a single helper, but will gain more as more functionality is added to the `kernel` crate in the future. Reviewed-by: Greg Kroah-Hartman Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Geoffrey Thomas Signed-off-by: Geoffrey Thomas Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Co-developed-by: Sven Van Asbroeck Signed-off-by: Sven Van Asbroeck Co-developed-by: Gary Guo Signed-off-by: Gary Guo Co-developed-by: Boqun Feng Signed-off-by: Boqun Feng Co-developed-by: Maciej Falkowski Signed-off-by: Maciej Falkowski Co-developed-by: Wei Liu Signed-off-by: Wei Liu Signed-off-by: Miguel Ojeda

linux/rust/helpers.c, branch v6.3

rust: sync: add `Arc` for ref-counted allocations

rust: add C helpers