partially revert " signal: Define __ARCH_HAS_SA_RESTORER so we know whether to clear sa_restorer "
partially revert " x86: Remove the ancient and deprecated disable_hlt() and enable_hlt() facility "
partially revert "x86-32: Fix invalid stack address while in softirq"
formatting and whitespaces....
revert "cpuset: mm: reduce large amounts of memory barrier related damage v3"