linux-kernel - [PATCH -tip] x86: ftrace

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Message-ID: <20090126152802.GA12465@localhost>
Date:	Mon, 26 Jan 2009 18:28:02 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH -tip] x86: ftrace - simplify wait_for_nmi

Get rid of 'waited' stack variable.

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---
 arch/x86/kernel/ftrace.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

Index: linux-2.6.git/arch/x86/kernel/ftrace.c
===================================================================
--- linux-2.6.git.orig/arch/x86/kernel/ftrace.c
+++ linux-2.6.git/arch/x86/kernel/ftrace.c
@@ -133,15 +133,14 @@ void ftrace_nmi_exit(void)
 
 static void wait_for_nmi(void)
 {
-	int waited = 0;
+	if (!atomic_read(&in_nmi))
+		return;
 
-	while (atomic_read(&in_nmi)) {
-		waited = 1;
+	do {
 		cpu_relax();
-	}
+	} while(atomic_read(&in_nmi));
 
-	if (waited)
-		nmi_wait_count++;
+	nmi_wait_count++;
 }
 
 static int
--
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