lkml.org 
[lkml]   [2015]   [Sep]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
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@linux-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@linux-mips.org>
[bwh: Backported to 3.2: trim the CPU type list]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit 8feb2a714b3478b2cde5c576fd9f47ef44b60e8d)

Signed-off-by: Willy Tarreau <w@1wt.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




\
 
 \ /
  Last update: 2015-09-13 01:41    [W:0.228 / U:2.448 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site