linux-kernel - [PATCH 2.6.32 35/62] MIPS: Fix cpu_has_mips_r2_exec

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Date:	Sun, 13 Sep 2015 00:56:41 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Ralf Baechle <ralf@...ux-mips.org>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 35/62] MIPS: Fix cpu_has_mips_r2_exec_hazard.

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Ralf Baechle <ralf@...ux-mips.org>

commit 9cdf30bd3bac697fc533988f44a117434a858f69 upstream.

Returns a non-zero value if the current processor implementation requires
an IHB instruction to deal with an instruction hazard as per MIPS R2
architecture specification, zero otherwise.

For a discussion, see http://patchwork.linux-mips.org/patch/9539/.

Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
[bwh: Backported to 3.2: trim the CPU type list]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit 8feb2a714b3478b2cde5c576fd9f47ef44b60e8d)

Signed-off-by: Willy Tarreau <w@....eu>
---
 arch/mips/include/asm/cpu-features.h | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
index 1f4df64..a3dbb59 100644
--- a/arch/mips/include/asm/cpu-features.h
+++ b/arch/mips/include/asm/cpu-features.h
@@ -150,8 +150,32 @@
 #define cpu_has_mips_r	(cpu_has_mips32r1 | cpu_has_mips32r2 | \
 			 cpu_has_mips64r1 | cpu_has_mips64r2)
 
+/*
+ * cpu_has_mips_r2_exec_hazard - return if IHB is required on current processor
+ *
+ * Returns non-zero value if the current processor implementation requires
+ * an IHB instruction to deal with an instruction hazard as per MIPS R2
+ * architecture specification, zero otherwise.
+ */
 #ifndef cpu_has_mips_r2_exec_hazard
-#define cpu_has_mips_r2_exec_hazard cpu_has_mips_r2
+#define cpu_has_mips_r2_exec_hazard					\
+({									\
+	int __res;							\
+									\
+	switch (current_cpu_type()) {					\
+	case CPU_74K:							\
+	case CPU_CAVIUM_OCTEON:						\
+	case CPU_CAVIUM_OCTEON_PLUS:					\
+	case CPU_CAVIUM_OCTEON2:					\
+		__res = 0;						\
+		break;							\
+									\
+	default:							\
+		__res = 1;						\
+	}								\
+									\
+	__res;								\
+})
 #endif
 
 /*
-- 
1.7.12.2.21.g234cd45.dirty



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