linux-kernel - [PATCH 2/4] tracing: Forget about the nmi buffer from syscall events

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Date:	Sun, 22 Nov 2009 05:21:33 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...hat.com>
Subject: [PATCH 2/4] tracing: Forget about the nmi buffer from syscall events

We are never in an nmi context when we commit a syscall trace to
perf. So just forget about the nmi buffer there.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Jason Baron <jbaron@...hat.com>
---
 kernel/trace/trace_syscalls.c |   10 ++--------
 1 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 0bb9348..41b6dd9 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -511,10 +511,7 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
 
 	cpu = smp_processor_id();
 
-	if (in_nmi())
-		trace_buf = rcu_dereference(perf_trace_buf_nmi);
-	else
-		trace_buf = rcu_dereference(perf_trace_buf);
+	trace_buf = rcu_dereference(perf_trace_buf);
 
 	if (!trace_buf)
 		goto end;
@@ -617,10 +614,7 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
 
 	cpu = smp_processor_id();
 
-	if (in_nmi())
-		trace_buf = rcu_dereference(perf_trace_buf_nmi);
-	else
-		trace_buf = rcu_dereference(perf_trace_buf);
+	trace_buf = rcu_dereference(perf_trace_buf);
 
 	if (!trace_buf)
 		goto end;
-- 
1.6.2.3

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