LoongArch: Explicitly specify code model in Makefile

LoongArch's toolchain may change the default code model from normal to
medium. This is unnecessary for kernel, and generates some relocations
which cannot be handled by the module loader. So explicitly specify the
code model to normal in Makefile (for Rust 'normal' is 'small').

Cc: stable@vger.kernel.org
Tested-by: Haiyong Sun <sunhaiyong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/Makefile

@@ -59,7 +59,7 @@ endif
 
 ifdef CONFIG_64BIT
 ld-emul			= $(64bit-emul)
-cflags-y		+= -mabi=lp64s
+cflags-y		+= -mabi=lp64s -mcmodel=normal
 endif
 
 cflags-y			+= -pipe $(CC_FLAGS_NO_FPU)
@@ -104,7 +104,7 @@ ifdef CONFIG_OBJTOOL
 KBUILD_CFLAGS			+= -fno-jump-tables
 endif
 
-KBUILD_RUSTFLAGS		+= --target=loongarch64-unknown-none-softfloat
+KBUILD_RUSTFLAGS		+= --target=loongarch64-unknown-none-softfloat -Ccode-model=small
 KBUILD_RUSTFLAGS_KERNEL		+= -Zdirect-access-external-data=yes
 KBUILD_RUSTFLAGS_MODULE		+= -Zdirect-access-external-data=no