Changes since v6 are only a rebase to linux-next as of 20260911 and a typo in the subject of patch 2 (was "list of mailboxes" instead of "list of locks").
I would really love to get this applied. Since there have not been any reviewers lately, maybe it is time to put it into -next and see what happens. I will be there to fix things. Or we just revert if it goes all wrong. But Matthew is the creator of XArray, I tested this as much as I could and I took the Sashiko reviews into account. I don't know what to do else. But I can't continue fixing the real issues in the hwspinlock subsystem unless this series is applied :/ Here is the old coverletter for more details: I will not add more functionality to upcoming versions of this series, only address review comments. I do have a list of issues I still want to fix in hwspinlock, but only once this series is applied. So, I hope we can upstream this soon. 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. Also, for debugging the hwspinlock core, it is helpful to change lock states from userspace to trigger corner cases. This series adds support for all that. The first patch converts the subsystem from the deprecated radix-tree to the easier to handle XArray (Thank you again, Matthew!). The second patch adds the summary in debugfs based on the new XArray implementation. The third patch implements the low level debug interface. A branch for testing is here: git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/hwspinlock/xarray It has been tested on a SparrowHawk board (R-Car V4H) with one MFIS instance and an Ironhide board (R-Car X5H) with two MFIS instances. Looking forward to comments. Matthew Wilcox (Oracle) (1): hwspinlock: Convert to XArray Wolfram Sang (2): hwspinlock: add list of locks to debugfs hwspinlock: add low level debug capabilities drivers/hwspinlock/hwspinlock_core.c | 369 ++++++++++++++++++++------- 1 file changed, 270 insertions(+), 99 deletions(-) -- 2.53.0
