linux-kernel - [PATCH 3/3] perf: Drop prefetch.h

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Date:	Wed,  5 Feb 2014 15:51:54 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Borislav Petkov <bp@...e.de>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Robert Richter <rric@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Namhyung Kim <namhyung@...il.com>
Subject: [PATCH 3/3] perf: Drop prefetch.h

From: Borislav Petkov <bp@...e.de>

This was needed at the time before e66eed651fd1 ("list: remove
prefetching from regular list iterators") where the list iterators did
prefetch elements. This turned out to be counter-productive and hurt
performance and they were removed. Which makes the prefetch.h header
unused so drop it.

Signed-off-by: Borislav Petkov <bp@...e.de>
---
 tools/perf/Makefile.perf                 | 1 -
 tools/perf/util/include/linux/list.h     | 1 -
 tools/perf/util/include/linux/prefetch.h | 6 ------
 3 files changed, 8 deletions(-)
 delete mode 100644 tools/perf/util/include/linux/prefetch.h

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 1afe52f72d1c..f4f2c3a3c094 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -219,7 +219,6 @@ LIB_H += util/include/linux/kernel.h
 LIB_H += util/include/linux/list.h
 LIB_H += util/include/linux/export.h
 LIB_H += util/include/linux/poison.h
-LIB_H += util/include/linux/prefetch.h
 LIB_H += util/include/linux/rbtree.h
 LIB_H += util/include/linux/rbtree_augmented.h
 LIB_H += util/include/linux/string.h
diff --git a/tools/perf/util/include/linux/list.h b/tools/perf/util/include/linux/list.h
index 1d928a0ce997..bfe0a2afd0d2 100644
--- a/tools/perf/util/include/linux/list.h
+++ b/tools/perf/util/include/linux/list.h
@@ -1,5 +1,4 @@
 #include <linux/kernel.h>
-#include <linux/prefetch.h>
 
 #include "../../../../include/linux/list.h"
 
diff --git a/tools/perf/util/include/linux/prefetch.h b/tools/perf/util/include/linux/prefetch.h
deleted file mode 100644
index 7841e485d8c3..000000000000
--- a/tools/perf/util/include/linux/prefetch.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#ifndef PERF_LINUX_PREFETCH_H
-#define PERF_LINUX_PREFETCH_H
-
-static inline void prefetch(void *a __attribute__((unused))) { }
-
-#endif
-- 
1.8.5.2.192.g7794a68

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