MIPS: Loongson: Add GCC 4.4 support for Loongson2E

Because only gcc >=4.4 have loongson-specific support, we need to choose
the suitable -march argument for gcc <= 4.3 and gcc >= 4.4, and here, we
use -march=loongson2e for loongson2e.

Thanks goes to Arnaud Patard <apatard@mandriva.com> for suggestion of
using cc-options(Documentation/kbuild/makefiles.txt). and thanks Zhang
Le for introducing the new CPU_LOONGSON2E kernel option.

NOTE: -mtune option is not need if -march and -mtune use the same value.

Signed-off-by: Zhang Le <r0bertz@gentoo.org>
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 11 insertions, 7 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 482dcc3b91e1..466920aa067f 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1030,12 +1030,10 @@ choice
         prompt "CPU type"
         default CPU_R4X00
 
-config CPU_LOONGSON2
-        bool "Loongson 2"
-        depends on SYS_HAS_CPU_LOONGSON2
-        select CPU_SUPPORTS_32BIT_KERNEL
-        select CPU_SUPPORTS_64BIT_KERNEL
-        select CPU_SUPPORTS_HIGHMEM
+config CPU_LOONGSON2E
+        bool "Loongson 2E"
+        depends on SYS_HAS_CPU_LOONGSON2E
+        select CPU_LOONGSON2
         help
           The Loongson 2E processor implements the MIPS III instruction set
           with many extensions.
@@ -1282,7 +1280,13 @@ config CPU_CAVIUM_OCTEON
 
 endchoice
 
-config SYS_HAS_CPU_LOONGSON2
+config CPU_LOONGSON2
+        bool
+        select CPU_SUPPORTS_32BIT_KERNEL
+        select CPU_SUPPORTS_64BIT_KERNEL
+        select CPU_SUPPORTS_HIGHMEM
+
+config SYS_HAS_CPU_LOONGSON2E
         bool
 
 config SYS_HAS_CPU_MIPS32_R1