[PATCH v3 resend] Perf-tool/MIPS: support cross compiling of tools/perf for MIPS

[PATCH v3 resend] Perf-tool/MIPS: support cross compiling of tools/perf for MIPS

[Deng-Cheng Zhu]

(Resending this version of patch to append the changelogs.)

This version fixed the cosmetic issue pointed out by Ralf. If it looks ok,

Ralf, please help Ack it. Thanks!


Changes
--------
v3 - v2:
o Fix the cosmetic issue of redundant dot-ops

v2 - v1:
o Change rmb() to use SYNC

v1:
o Include mips unistd.h and define rmb()/cpu_relax() in tools/perf/perf.h

Signed-off-by: Deng-Cheng Zhu<dengcheng.zhu@gmail.com>

---
 tools/perf/perf.h |   12 ++++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 6fb379b..cd05284 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -73,6 +73,18 @@
 #define cpu_relax()	asm volatile("":::"memory")
 #endif

+#ifdef __mips__
+#include "../../arch/mips/include/asm/unistd.h"
+#define rmb()		asm volatile(					\
+				".set	mips2\n\t"			\
+				"sync\n\t"				\
+				".set	mips0"				\
+				: /* no output */			\
+				: /* no input */			\
+				: "memory")
+#define cpu_relax()	asm volatile("" ::: "memory")
+#endif
+
 #include<time.h>
 #include<unistd.h>
 #include<sys/types.h>