The 5.3-rc2 kernel prepatch is available
for testing. “There are fixes all over, I don’t think there’s much of a pattern
here. The three areas that do stand out are Documentation (more rst
conversions), arch updates (mainly because of the netx arm platform
removal) and misc driver fixes (gpu, iommu, net, nvdimm, sound
..)“.

Source: LWN.net – Kernel prepatch 5.3-rc2