Our binutils somehow ended up with a -mfix-gs2f-kernel, rather than
-mfix-ls2f-kernel.  Cope with it.
Also, the old ld can't cope with thin archives very well: it fails
to create vmlinux.o.  So, disable thin archives.

Index: arch/mips/loongson64/Platform
===================================================================
--- arch/mips/loongson64/Platform.orig	2015-08-15 10:30:17.338956604 -0400
+++ arch/mips/loongson64/Platform	2015-08-15 10:32:47.841031800 -0400
@@ -10,6 +10,12 @@
 	$(call cc-option,-march=loongson2f,-march=r4600)
 # Enable the workarounds for Loongson2f
 ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
+ ifneq ($(call as-option,-Wa$(comma)-mfix-gs2f-kernel,),)
+   cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa$(comma)-mfix-gs2f-kernel
+   ifneq ($(CONFIG_CPU_NOP_WORKAROUNDS),$(CONFIG_CPU_JUMP_WORKAROUNDS))
+     cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa$(comma)-mfix-gs2f-kernel
+   endif
+ else
   ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-nop,),)
     $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop)
   else
@@ -20,6 +26,7 @@
   else
     cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-jump
   endif
+ endif
 endif
 
 #
Index: arch/Kconfig
===================================================================
--- arch/Kconfig.orig	2017-08-20 17:13:52.000000000 -0400
+++ arch/Kconfig	2017-08-30 07:40:42.626782220 -0400
@@ -575,7 +575,7 @@
 endchoice
 
 config THIN_ARCHIVES
-	def_bool y
+	bool
 	help
 	  Select this if the architecture wants to use thin archives
 	  instead of ld -r to create the built-in.o files.