linux-kernel - [tip:perf/core] perf tools: Adding round_up/round

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Message-ID: <tip-339ce005091b156c2af4c016c6ba9c1f87cd826a@git.kernel.org>
Date:	Fri, 6 Jul 2012 04:00:47 -0700
From:	tip-bot for Jiri Olsa <jolsa@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, eranian@...gle.com, mingo@...nel.org,
	gorcunov@...nvz.org, a.p.zijlstra@...llo.nl,
	benjamin.redelings@...cent.org, jolsa@...hat.com,
	drepper@...il.com, robert.richter@....com, fweisbec@...il.com,
	tglx@...utronix.de, cjashfor@...ux.vnet.ibm.com, asharma@...com,
	linux-kernel@...r.kernel.org, hpa@...or.com, fche@...hat.com,
	paulus@...ba.org, tzanussi@...il.com,
	masami.hiramatsu.pt@...achi.com
Subject: [tip:perf/core] perf tools: Adding round_up/round_down macros

Commit-ID:  339ce005091b156c2af4c016c6ba9c1f87cd826a
Gitweb:     http://git.kernel.org/tip/339ce005091b156c2af4c016c6ba9c1f87cd826a
Author:     Jiri Olsa <jolsa@...hat.com>
AuthorDate: Tue, 19 Jun 2012 17:48:11 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 29 Jun 2012 15:25:28 -0300

perf tools: Adding round_up/round_down macros

Adding round_up and round_down macros. They will be used in upcoming
patches.

Signed-off-by: Jiri Olsa <jolsa@...hat.com>
Cc: Arun Sharma <asharma@...com>
Cc: Benjamin Redelings <benjamin.redelings@...cent.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Frank Ch. Eigler <fche@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Robert Richter <robert.richter@....com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Tom Zanussi <tzanussi@...il.com>
Cc: Ulrich Drepper <drepper@...il.com>
Link: http://lkml.kernel.org/r/1340120894-9465-21-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/include/linux/kernel.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/include/linux/kernel.h b/tools/perf/util/include/linux/kernel.h
index 1eb804f..b6842c1 100644
--- a/tools/perf/util/include/linux/kernel.h
+++ b/tools/perf/util/include/linux/kernel.h
@@ -108,4 +108,14 @@ int eprintf(int level,
 #define pr_debug3(fmt, ...) pr_debugN(3, pr_fmt(fmt), ##__VA_ARGS__)
 #define pr_debug4(fmt, ...) pr_debugN(4, pr_fmt(fmt), ##__VA_ARGS__)
 
+/*
+ * This looks more complex than it should be. But we need to
+ * get the type for the ~ right in round_down (it needs to be
+ * as wide as the result!), and we want to evaluate the macro
+ * arguments just once each.
+ */
+#define __round_mask(x, y) ((__typeof__(x))((y)-1))
+#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
+#define round_down(x, y) ((x) & ~__round_mask(x, y))
+
 #endif
--
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