Revert "mutex: back out architecture specific check for negative mutex count"

This reverts commit cb7fecb0bc681066703f18282325ca6d3f1b8e8b.
Revert "mutex: Queue mutex spinners with MCS lock to reduce cacheline contention"

This reverts commit a914b070132a0292c91435c4a4857bbc73aaec32.
Revert "mutex: Make more scalable by doing less atomic operations"

This reverts commit 8db748a1e3043c1e4171b56735b94475adc9af19.
Revert "aio: convert the ioctx list to radix tree"

This reverts commit 80923e26bf7ee803747692ac5d87c69739e94b48.
Revert "kbuild: drop cpuinit/cpuexit checks in modpost"

This reverts commit 2d1568e11d7d7c80e20a8175a64b5cabf77dd2a3.