* [PATCH] MIPS: Loongson2ef: Disable Loongson MMI instructions
@ 2020-09-23 10:33 Jiaxun Yang
2020-09-24 13:51 ` Thomas Bogendoerfer
0 siblings, 1 reply; 2+ messages in thread
From: Jiaxun Yang @ 2020-09-23 10:33 UTC (permalink / raw)
To: linux-mips
Cc: Jiaxun Yang, Thomas Bogendoerfer, stable, Paul Burton, linux-kernel
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: 71e2f4dd5a65 ("MIPS: Fork loongson2ef from loongson64")
Reported-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: stable@vger.kernel.org # v5.8+
---
arch/mips/loongson2ef/Platform | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/mips/loongson2ef/Platform b/arch/mips/loongson2ef/Platform
index 4ab55f1123a0..ae023b9a1c51 100644
--- a/arch/mips/loongson2ef/Platform
+++ b/arch/mips/loongson2ef/Platform
@@ -44,6 +44,10 @@ 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
#
--
2.28.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] MIPS: Loongson2ef: Disable Loongson MMI instructions
2020-09-23 10:33 [PATCH] MIPS: Loongson2ef: Disable Loongson MMI instructions Jiaxun Yang
@ 2020-09-24 13:51 ` Thomas Bogendoerfer
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Bogendoerfer @ 2020-09-24 13:51 UTC (permalink / raw)
To: Jiaxun Yang; +Cc: linux-mips, stable, Paul Burton, linux-kernel
On Wed, Sep 23, 2020 at 06:33:12PM +0800, Jiaxun Yang wrote:
> 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: 71e2f4dd5a65 ("MIPS: Fork loongson2ef from loongson64")
> Reported-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: stable@vger.kernel.org # v5.8+
> ---
> arch/mips/loongson2ef/Platform | 4 ++++
> 1 file changed, 4 insertions(+)
applied to mips-fixes.
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
^ permalink raw reply [flat|nested] 2+ messages in thread
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