The 4.9 merge window closes

Linus has released 4.9-rc1 and closed the merge window for this release one day earlier than some might have expected. "My own favorite 'small detail under the hood' happens to be Andy Lutomirski's new virtually mapped kernel stack allocations. They make it easier to find and recover from stack overflows, but the effort also cleaned up some code, and added a kernel stack mapping cache to avoid any performance downsides." The virtually mapped kernel stack work was covered here in June. There were 14,308 non-merge changesets pulled for this release, meaning that 4.9 will be, by far, the busiest development cycle ever.

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