[PATCH] ARM: 2680/1: refine TLS reg availability some more again

Patch from Nicolas Pitre

Not all ARMv6 processors implement the TLS register.

Signed-off-by: Nicolas Pitre
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 10 insertions, 11 deletions

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 07646d25e265..48bac7da8c70 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -412,21 +412,20 @@ config CPU_BPREDICT_DISABLE
 
 config TLS_REG_EMUL
         bool
-        default y if (SMP || CPU_32v6) && (CPU_32v5 || CPU_32v4 || CPU_32v3)
+        default y if SMP && (CPU_32v5 || CPU_32v4 || CPU_32v3)
         help
-          We might be running on an ARMv6+ processor which should have the TLS
-          register but for some reason we can't use it, or maybe an SMP system
-          using a pre-ARMv6 processor (there are apparently a few prototypes
-          like that in existence) and therefore access to that register must
-          be emulated.
+          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
-        default y if !TLS_REG_EMUL
+        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.  If a particular
-          ARMv6 or later CPU doesn't support it then it must include "select
-          TLS_REG_EMUL" along with its other characteristics.
+          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.