tracing: Forget about the NMI buffer for syscall events
authorFrederic Weisbecker <fweisbec@gmail.com>
Sun, 22 Nov 2009 04:21:33 +0000 (05:21 +0100)
committerIngo Molnar <mingo@elte.hu>
Sun, 22 Nov 2009 08:03:42 +0000 (09:03 +0100)
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>
kernel/trace/trace_syscalls.c

index 0bb93487526325771863958b17594ab9ff261a28..41b6dd963daad12efcadc7711d9d73319eb96bfe 100644 (file)
@@ -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;