This is a note to let you know that I've just added the patch titled MIPS: Loongson2ef: Disable Loongson MMI instructions to the 5.8-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mips-loongson2ef-disable-loongson-mmi-instructions.patch and it can be found in the queue-5.8 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b13812ddea615b6507beef24f76540c0c1143c5c Mon Sep 17 00:00:00 2001 From: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> Date: Wed, 23 Sep 2020 18:33:12 +0800 Subject: MIPS: Loongson2ef: Disable Loongson MMI instructions From: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> commit b13812ddea615b6507beef24f76540c0c1143c5c 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@xxxxxxxxxxx> Fixes: 71e2f4dd5a65 ("MIPS: Fork loongson2ef from loongson64") Reported-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx # v5.8+ Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/mips/loongson2ef/Platform | 4 ++++ 1 file changed, 4 insertions(+) --- 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 # Patches currently in stable-queue which might be from jiaxun.yang@xxxxxxxxxxx are queue-5.8/mips-loongson2ef-disable-loongson-mmi-instructions.patch