linux-kernel - [tip:perf/core] perf tools: Remove unused cpu

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Date:   Tue, 22 Aug 2017 03:25:25 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     namhyung@...nel.org, dsahern@...il.com, mingo@...nel.org,
        wangnan0@...wei.com, jolsa@...nel.org, tglx@...utronix.de,
        hpa@...or.com, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, acme@...hat.com,
        a.p.zijlstra@...llo.nl
Subject: [tip:perf/core] perf tools: Remove unused cpu_relax() macros

Commit-ID:  4717e03cc7e826818c3f9bd60e9c304a3309c3ad
Gitweb:     http://git.kernel.org/tip/4717e03cc7e826818c3f9bd60e9c304a3309c3ad
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Thu, 17 Aug 2017 16:44:36 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 17 Aug 2017 16:51:25 -0300

perf tools: Remove unused cpu_relax() macros

Since 195564390210 ("perf_counter: kerneltop: simplify data_head read")
we do not use it, and this was way back in 2009, remove it before some
other arch maintainer adds its implementation, like so many did,
needlessly :-)

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/n/tip-3l2su9c58eaq4twjzrf9uu08@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/perf-sys.h | 9 ---------
 1 file changed, 9 deletions(-)

diff --git a/tools/perf/perf-sys.h b/tools/perf/perf-sys.h
index e4b717e..2aaa736 100644
--- a/tools/perf/perf-sys.h
+++ b/tools/perf/perf-sys.h
@@ -10,12 +10,10 @@
 #include <asm/barrier.h>
 
 #if defined(__i386__)
-#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
 #define CPUINFO_PROC	{"model name"}
 #endif
 
 #if defined(__x86_64__)
-#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
 #define CPUINFO_PROC	{"model name"}
 #endif
 
@@ -44,7 +42,6 @@
 #endif
 
 #ifdef __ia64__
-#define cpu_relax()	asm volatile ("hint @pause" ::: "memory")
 #define CPUINFO_PROC	{"model name"}
 #endif
 
@@ -53,7 +50,6 @@
 #endif
 
 #ifdef __aarch64__
-#define cpu_relax()	asm volatile("yield" ::: "memory")
 #endif
 
 #ifdef __mips__
@@ -73,14 +69,9 @@
 #endif
 
 #ifdef __tile__
-#define cpu_relax()	asm volatile ("mfspr zero, PASS" ::: "memory")
 #define CPUINFO_PROC    {"model name"}
 #endif
 
-#ifndef cpu_relax
-#define cpu_relax() barrier()
-#endif
-
 static inline int
 sys_perf_event_open(struct perf_event_attr *attr,
 		      pid_t pid, int cpu, int group_fd,