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tracing: Forget about the NMI buffer for syscall events

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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@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
LKML-Reference: <1258863695-10464-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2009-11-22 05:21:33 +01:00 committed by Ingo Molnar
parent ce71b9df88
commit 28889bf9e2
1 changed files with 2 additions and 8 deletions
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10
kernel/trace/trace_syscalls.c
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@ -511,10 +511,7 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
cpu = smp_processor_id(); cpu = smp_processor_id();
if (in_nmi()) trace_buf = rcu_dereference(perf_trace_buf);
trace_buf = rcu_dereference(perf_trace_buf_nmi);
else
trace_buf = rcu_dereference(perf_trace_buf);
if (!trace_buf) if (!trace_buf)
goto end; goto end;
@ -617,10 +614,7 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
cpu = smp_processor_id(); cpu = smp_processor_id();
if (in_nmi()) trace_buf = rcu_dereference(perf_trace_buf);
trace_buf = rcu_dereference(perf_trace_buf_nmi);
else
trace_buf = rcu_dereference(perf_trace_buf);
if (!trace_buf) if (!trace_buf)
goto end; goto end;