MIPS: Loongson2ef: Disable Loongson MMI instructions

FlyGoat · gregkh · commit 22dd2387ee81 · 2020-10-01T17:36:34.000+02:00
commit b13812d upstream. It was missed when I was forking Loongson2ef from Loongson64 but should be applied to Loongson2ef as march=loongson2f will also enable Loongson MMI in GCC-9+. Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Fixes: 71e2f4d ("MIPS: Fork loongson2ef from loongson64") Reported-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: stable@vger.kernel.org # v5.8+ Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/arch/mips/loongson2ef/Platform b/arch/mips/loongson2ef/Platform
@@ -22,6 +22,10 @@ ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
   endif
 endif
 
+# Some -march= flags enable MMI instructions, and GCC complains about that
+# support being enabled alongside -msoft-float. Thus explicitly disable MMI.
+cflags-y += $(call cc-option,-mno-loongson-mmi)
+
 #
 # Loongson Machines' Support
 #

Original file line number	Diff line number	Diff line change
`@@ -22,6 +22,10 @@ ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS`
`22`	`22`	`endif`
`23`	`23`	`endif`
`24`	`24`
	`25`	`+# Some -march= flags enable MMI instructions, and GCC complains about that`
	`26`	`+# support being enabled alongside -msoft-float. Thus explicitly disable MMI.`
	`27`	`+cflags-y += $(call cc-option,-mno-loongson-mmi)`
	`28`	`+`
`25`	`29`	`#`
`26`	`30`	`# Loongson Machines' Support`
`27`	`31`	`#`