perf, MIPS: Support cross compiling of tools/perf for MIPS

Changes:
 v4: Fix the cosmetic issue of redundant dot-ops
 v3: Change rmb() to use SYNC
 v2: Include mips unistd.h and define rmb()/cpu_relax() in tools/perf/perf.h

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index ef7aa0a0c5265191e8120e76f9f134b5e241fa53..95aaf565c704fb6ea67cee78d49e177f0ba8f595 100644 (file)
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -73,6 +73,18 @@ void get_term_dimensions(struct winsize *ws);
 #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>