ARM: 6207/1: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6

The TLS register is only available on ARM1136 r1p0 and later.
Set HWCAP_TLS flags if hardware TLS is available and test for
it if CONFIG_CPU_32v6K is not set for V6.

Note that we set the TLS instruction in __kuser_get_tls
dynamically as suggested by Jamie Lokier <jamie@shareable.org>.

Also the __switch_to code is optimized out in most cases as
suggested by Nicolas Pitre <nico@fluxnic.net>.

Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 0 insertions, 11 deletions

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 346ae14824a5..71d5d5efceef 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -717,17 +717,6 @@ config TLS_REG_EMUL
           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