Revert "jiffies conversions: Use compile time constants when possible"

This reverts commit 7e6a7b87333e3cb0a9594491b1c4362ee3ffe47c.
Revert "jiffies conversions: Use compile time constants when possible"

This reverts commit 76086428306521fcd93f0a745af43b107a9ffe3e.
Revert "intelli_plug: code review clean up"

This reverts commit 239892ff878e62afbc8601726919632cb8ce5126.
Revert "bfq-iosched: Tuning for SSD"

This reverts commit f5cc3a7957789d8f04fd3d395616a47cc4cd8482.
Revert "slub.c: Remove PAGE_ALLOC_COSTLY_ORDER - +3% boost"

This reverts commit 6e75a78cfbe78a112022c8bd414f82b1f641ab69.