[PATCH] MIPS: Provide Kconfig option for default IEEE754 conformance mode

From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: linux-mips@vger.kernel.org
Cc: "Jiaxun Yang" <jiaxun.yang@flygoat.com>,
	"Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
	"Paul Burton" <paulburton@kernel.org>,
	"Huacai Chen" <chenhc@lemote.com>,
	"Serge Semin" <Sergey.Semin@baikalelectronics.ru>,
	"Zhou Yanjie" <zhouyanjie@zoho.com>,
	"周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>,
	"Liangliang Huang" <huanglllzu@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] MIPS: Provide Kconfig option for default IEEE754 conformance mode
Date: Fri, 31 Jul 2020 12:10:16 +0800	[thread overview]
Message-ID: <20200731041018.1381642-1-jiaxun.yang@flygoat.com> (raw)

Requested by downstream distros, a Kconfig option for default
IEEE754 conformance mode allows them to set their mode to
relaxed by default.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
 arch/mips/Kconfig            | 21 +++++++++++++++++++++
 arch/mips/kernel/cpu-probe.c | 12 +++++++++++-
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f6bb446d30f0..ef5b2a177b1b 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2877,6 +2877,27 @@ config MIPS_NR_CPU_NR_MAP
 	default 1024 if MIPS_NR_CPU_NR_MAP_1024
 	default NR_CPUS if !MIPS_NR_CPU_NR_MAP_1024
 
+choice
+	prompt "Default IEEE Std 754 conformance mode"
+	default IEEE754_DEFAULT_STRICT
+	help
+	  Default IEEE Std 754 conformance mode, see ieee754= kernel parameter
+	  for detail.
+
+	config IEEE754_DEFAULT_STRICT
+		bool "Strict"
+
+	config IEEE754_DEFAULT_LEGACY
+		bool "Legacy"
+
+	config IEEE754_DEFAULT_STD2008
+		bool "2008"
+
+	config IEEE754_DEFAULT_RELAXED
+		bool "Relaxed"
+
+endchoice
+
 #
 # Timer Interrupt Frequency Configuration
 #
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index d9e8d39a7289..03adeed58efb 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -157,7 +157,17 @@ static void cpu_set_fpu_2008(struct cpuinfo_mips *c)
  * IEEE 754 conformance mode to use.  Affects the NaN encoding and the
  * ABS.fmt/NEG.fmt execution mode.
  */
-static enum { STRICT, LEGACY, STD2008, RELAXED } ieee754 = STRICT;
+enum ieee754_mode { STRICT, LEGACY, STD2008, RELAXED };
+
+#if defined(CONFIG_IEEE754_DEFAULT_STRICT)
+static enum ieee754_mode ieee754 = STRICT;
+#elif defined(CONFIG_IEEE754_DEFAULT_LEGACY)
+static enum ieee754_mode ieee754 = LEGACY;
+#elif defined(CONFIG_IEEE754_DEFAULT_STD2008)
+static enum ieee754_mode ieee754 = STD2008;
+#elif defined(CONFIG_IEEE754_DEFAULT_RELAXED)
+static enum ieee754_mode ieee754 = RELAXED;
+#endif
 
 /*
  * Set the IEEE 754 NaN encodings and the ABS.fmt/NEG.fmt execution modes
-- 
2.28.0

