[$] 5.19 Merge window, part 1

As of this writing, just under 4,600 non-merge changesets have been pulledinto the mainline repository for the 5.19 development cycle. The 5.19merge window is clearly well underway. The changes pulled so far cover anumber of areas, including the core kernel, architecture support, networking,security, and virtualization; read on for highlights from the first part ofthis merge window.