On Mon, Mar 25, 2024 at 01:59:55PM -0700, Boqun Feng wrote: > On Mon, Mar 25, 2024 at 10:44:45AM +0000, Mark Rutland wrote: > [...] > > > > > > * I choose to re-implement atomics in Rust `asm` because we are still > > > figuring out how we can make it easy and maintainable for Rust to call > > > a C function _inlinely_ (Gary makes some progress [2]). Otherwise, > > > atomic primitives would be function calls, and that can be performance > > > bottleneck in a few cases. > > > > I don't think we want to maintain two copies of each architecture's atomics. > > This gets painful very quickly (e.g. as arm64's atomics get patched between > > LL/SC and LSE forms). > > > > No argument here ;-) Didn't we talk about bindgen being able to convert inline C functions into equivalent inline Rust functions? ISTR that getting stuck on Rust not having a useful inline asm. But fixing all that in a hurry seems like the much saner path forward.
