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[S390] ftrace: drop nmi protection

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The function graph tracer used to have a protection against NMI
while entering a function entry tracing. But this is useless now,
the tracer is reentrant and the ring buffer supports NMI tracing.

Same as 07868b086cca784f4b532fc2ab574ec3a73b468a for x86.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2009-10-06 10:34:07 +02:00 committed by Martin Schwidefsky
parent 593c4f7398
commit 22ceaf408f
1 changed files with 0 additions and 3 deletions
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3
arch/s390/kernel/ftrace.c
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@ -185,9 +185,6 @@ unsigned long prepare_ftrace_return(unsigned long ip, unsigned long parent)
{
struct ftrace_graph_ent trace;
/* Nmi's are currently unsupported. */
if (unlikely(in_nmi()))
goto out;
if (unlikely(atomic_read(&current->tracing_graph_pause)))
goto out;
if (ftrace_push_return_trace(parent, ip, &trace.depth, 0) == -EBUSY)