1 files changed, 14 insertions, 9 deletions

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 27892e34b060..48bac7da8c70 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -410,17 +410,22 @@ config CPU_BPREDICT_DISABLE
         help
           Say Y here to disable branch prediction.  If unsure, say N.
 
+config TLS_REG_EMUL
+        bool
+        default y if SMP && (CPU_32v5 || CPU_32v4 || CPU_32v3)
+        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 CPU_32v6 && !CPU_32v5 && !CPU_32v4 && !CPU_32v3
-        default y
+        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 ARMv6 or later.  However
-          if the kernel is configured to support multiple CPUs including
-          a pre-ARMv6 processors, or if a given ARMv6 processor doesn't
-          implement the thread register for some reason, then access to
-          this register from user space must be trapped and emulated.
-          If user space is relying on the __kuser_get_tls code then
-          there should not be any impact.
+          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.