On Mon, Jun 22, 2026 at 02:59:23PM +0100, Matthew Wilcox wrote: > On Mon, Jun 22, 2026 at 10:51:59AM +0200, Wolfram Sang wrote: > > Renesas R-Car SoCs have their spinlocks inside a unit called MFIS. Up to > > R-Car Gen4, there was only one MFIS unit on the SoC. Gen5, though, has > > multiple instances and, thus, multiple spinlock providers. The spinlocks > > are meant for specific cases (AP<->AP, AP<->RT, AP<->SCP...). For > > development on these systems, it is helpful to have an overview of > > registered spinlocks in debugfs. This series adds support for that. The > > first two patches update the radix-tree header to support more lock > > types. The third patch fixes a missing RCU annotation for the slot > > pointer. The fourth patch finally adds the desired functionality. > > > > Because the radix tree seems to have no dedicated tree nor maintainer, I > > suggest that all these patches go in via hwspinlock. This also keeps the > > dependencies zero. > > The radix tree is deprecated. I don't want to add any new functionality > to it. Here's a replacement patch to convert hwspinlock to use an > XArray instead of a radix tree. Compile tested only.
Wow, thanks a ton! I have a conference coming up but I still hope to be able to test your patch this week. We will see...
