[$] The rest of the 6.9 merge window

The 6.9-rc1kernel prepatch was released on March24, closing the merge window forthis development cycle. By that time, 12,435 non-merge changesets had beenmerged into the mainline, making for a less-busy merge window than the lastcouple of kernel releases (but similar to the 12,492 seen for 6.5). Wellover 7,000 of those changes were merged after the first-half merge-window summary waswritten, meaning that the latter part of the merge window brought many moreinteresting changes.