+
+config TLS_REG_EMUL
+ bool
+ help
+ An SMP system using a pre-ARMv6 processor (there are apparently
+ a few prototypes like that in existence) and therefore access to
+ that required register must be emulated.
+
+config HAS_TLS_REG
+ bool
+ depends on !TLS_REG_EMUL
+ default y if SMP || CPU_32v7
+ help
+ This selects support for the CP15 thread register.
+ It is defined to be available on some ARMv6 processors (including
+ all SMP capable ARMv6's) or later processors. User space may
+ assume directly accessing that register and always obtain the
+ expected value only on ARMv7 and above.
+
+config NEEDS_SYSCALL_FOR_CMPXCHG
+ bool
+ help
+ SMP on a pre-ARMv6 processor? Well OK then.
+ Forget about fast user space cmpxchg support.
+ It is just not possible.
+