32 lines
1.2 KiB
Diff
32 lines
1.2 KiB
Diff
From: YunQiang Su <syq@debian.org>
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Date: Mon 16 Nov 2020 09:11:00 +0800
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Subject: Use RELAXED ieee754 mode for Loongson-3 as 3A 4000 is 2008-only
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Forwarded: not-needed
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There are 2 mode of value of IEEE NaN hardcoded by CPU.
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Currently, our mipsel/mips64el port is in so-called lagacy mode.
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Loongson 3A 4000 is set as the so-called 2008 mode.
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To make Debian workable on Loongson 3A 4000, we need set the kerenl in
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RELAXED mode.
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https://web.archive.org/web/20180830093617/https://dmz-portal.mips.com/wiki/MIPS_ABI_-_NaN_Interlinking
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diff --git a/arch/mips/kernel/fpu-probe.c b/arch/mips/kernel/fpu-probe.c
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index e689d6a83..667226f94 100644
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--- a/arch/mips/kernel/fpu-probe.c
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+++ b/arch/mips/kernel/fpu-probe.c
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@@ -144,7 +144,12 @@ static void cpu_set_fpu_2008(struct cpuinfo_mips *c)
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* IEEE 754 conformance mode to use. Affects the NaN encoding and the
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* ABS.fmt/NEG.fmt execution mode.
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*/
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-static enum { STRICT, LEGACY, STD2008, RELAXED } ieee754 = STRICT;
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+enum ieee754_mode { STRICT, LEGACY, STD2008, RELAXED };
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+#ifdef CONFIG_CPU_LOONGSON64
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+static enum ieee754_mode ieee754 = RELAXED;
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+#else
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+static enum ieee754_mode ieee754 = STRICT;
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+#endif
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/*
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* Set the IEEE 754 NaN encodings and the ABS.fmt/NEG.fmt execution modes
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