Revert "Revert "Lomemkiller: Fix typos from CK3 tweaks""

This reverts commit 24ab599488d1a46e1d3c543aaf8bf42a8fc001da.
Revert "mutex: Make more scalable by doing less atomic operations"

This reverts commit 8f37c920283bea17034d830d05bb0fa265b68278.
Revert "block: row-iosched: Idle mode triggered by readahead pages"

This reverts commit be4a39e2926eda6a37dc39bdeaa98abe30c2774b.