linux-kernel - [PATCH 12/13] perf tools: Adding round_up/round

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Date:	Mon,  2 Jul 2012 17:18:50 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
	Arun Sharma <asharma@...com>,
	Benjamin Redelings <benjamin.redelings@...cent.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Robert Richter <robert.richter@....com>,
	Stephane Eranian <eranian@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Ulrich Drepper <drepper@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 12/13] perf tools: Adding round_up/round_down macros

From: Jiri Olsa <jolsa@...hat.com>

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 file changed, 10 insertions(+)

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
-- 
1.7.9.2.358.g22243

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