No, it's not enough. One of the most important features missing is that kernel developers will want the equivalent of `git range-diff` (i.e. the ability to comp

No, it's not enough. One of the most important features missing is that kernel developers will want the equivalent of `git range-diff` (i.e. the ability to compare two versions of a single commit which was submitted as part of a batch of commits) in the UX for code review purposes. The lack of this feature makes the entire thing a non-starter, both Github and Gitlab. That said, they have accepted some PRs on GitHub at the past at one point as an experiment IIRC. But no, the current features they want are not there. The only real practical alternative is probably something like Gerrit, which still probably is missing features they want, or to write their own patch review tool on top of lore.lkml.org and some other infra.