linux-kernel - [PATCH 5.8 89/99] MIPS: Loongson2ef: Disable Loongson MMI instructions

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Message-Id: <20200929105934.120324540@linuxfoundation.org>
Date:   Tue, 29 Sep 2020 13:02:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: [PATCH 5.8 89/99] MIPS: Loongson2ef: Disable Loongson MMI instructions

From: Jiaxun Yang <jiaxun.yang@...goat.com>

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@...goat.com>
Fixes: 71e2f4dd5a65 ("MIPS: Fork loongson2ef from loongson64")
Reported-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: stable@...r.kernel.org # v5.8+
Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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
 #