Revert "lib: make _tolower() public"

This reverts commit b08c41c9ed014d48068b66bf6b443a95d216ef63.
Revert "lib/kstrtox: common code between kstrto*() and simple_strto*() functions"

This reverts commit 0c872dfa7500d1766efc958c04bb972ddd6f593e.
Revert "kernel: Move REPEAT_BYTE definition into linux/kernel.h"

This reverts commit 43e12845a30b3f03f8425461bdfef6dcd26fb61c.
Revert "vsprintf: optimize decimal conversion (again)"

This reverts commit 14c37565077f854361c56bb8b9b2d6ae8b6801f9.
Revert "timer: optimize apply_slack()"

This reverts commit fe989b51f0bab436fbbde85ca37d9bf5d766bce9.
Revert "char-random: increase default entropy settings to (256,512)"

This reverts commit 5dea84686324f552c914d51210056cc9baa6fc06.
Revert "ARM/mm: drop GFP_COMP for dma_alloc_coherent"

This reverts commit f4c7efb06045d74306d88e1e43469f5e671466f9.
Revert "init/main.c: execute lockdep_init as early as possible"

This reverts commit 5a09531442e39697a127c1fd14f88d85778068b3.