[ARM SMP] Add configuration option for ARMv6K processors

The 'K' extension adds several new instructions to the ARMv6 ISA
which are primerily useful for SMP.

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

3 files changed, 14 insertions, 1 deletions

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index d80749ae2a7e..c422759438d5 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -38,6 +38,7 @@ comma = ,
 # macro, but instead defines a whole series of macros which makes
 # testing for a specific architecture or later rather impossible.
 arch-$(CONFIG_CPU_32v6)         :=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6)
+arch-$(CONFIG_CPU_32v6K)        :=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6k,-march=armv5t -Wa$(comma)-march=armv6k)
 arch-$(CONFIG_CPU_32v5)         :=-D__LINUX_ARM_ARCH__=5 $(call cc-option,-march=armv5te,-march=armv4)
 arch-$(CONFIG_CPU_32v4)         :=-D__LINUX_ARM_ARCH__=4 -march=armv4
 arch-$(CONFIG_CPU_32v3)         :=-D__LINUX_ARM_ARCH__=3 -march=armv3
diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h
index 64a988c1ad44..f35d91fbe117 100644
--- a/arch/arm/lib/bitops.h
+++ b/arch/arm/lib/bitops.h
@@ -1,6 +1,6 @@
 #include <linux/config.h>
 
-#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_MPCORE)
+#if __LINUX_ARM_ARCH__ >= 6 && defined(CONFIG_CPU_32v6K)
         .macro  bitop, instr
         mov     r2, #1
         and     r3, r0, #7              @ Get bit offset
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 5568403e984d..e3c14d6b4328 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -250,6 +250,18 @@ config CPU_V6
         select CPU_COPY_V6
         select CPU_TLB_V6
 
+# ARMv6k
+config CPU_32v6K
+        bool "Support ARM V6K processor extensions" if !SMP
+        depends on CPU_V6
+        default y if SMP
+        help
+          Say Y here if your ARMv6 processor supports the 'K' extension.
+          This enables the kernel to use some instructions not present
+          on previous processors, and as such a kernel build with this
+          enabled will not boot on processors with do not support these
+          instructions.
+
 # Figure out what processor architecture version we should be using.
 # This defines the compiler instruction set which depends on the machine type.
 config CPU_32v3