My take is this: Hellwig is unhappy because he doesn't want Linux to become a multi-language project, at least if we take his words at face value (he did explicitly say he doesn't dislike rust, quote: ".. this cancer explicitly is a cross-language codebase and not rust itself, just to escape the flameware brigade").
This might have some technical merits, but that ship has already sailed when Linus decided to merge R4L into the kernel. If Hellwig wants to reverse that decision, he'll have to bring it to Linus, instead he's trying to block R4L patches and waste everyone's time and energy.
This might have some technical merits, but that ship has already sailed when Linus decided to merge R4L into the kernel. If Hellwig wants to reverse that decision, he'll have to bring it to Linus, instead he's trying to block R4L patches and waste everyone's time and energy.